HEI GMS81C4060, GMS81C4040 Datasheet

8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS87C4060
GMS81C4040

User’s Manual



MicroElectronics

Semiconductor Group of Hyundai Electronics Industrial Co., Ltd.

Additional information of this manual may be served by HYUNDAI Micro Electronics offices in Korea or Dis­tributors and Representatives listed at address directory.

HYUNDAI Micro Electronics res erves the right to make changes to any information here in at any time without
notice.

The information, diagrams and other data in this manual are correct and reliable; however, HYUNDAI Micro
Electronics is in no way responsible for any violations of patents or other rights of the third party generated by
the use of this manual.

Versi on 1.00

Published by
MCU Application Team bjli [e-mail] [e-mail]. kr



2000 HYUNDAI Micro Electronics All right reserved.

PRELIMINARY

GMS81C4040/87C4060

Nov. 1999 Ver 1.0

PRELIMINARY

1

Table of Contents

OVERVIEW.......................................... 1

Description...................................................1

Features .......................................................1

Development Tools..................................... 2

BLOCK DIAGRAM.............................. 3

PIN ASSIGNMENT.............................. 4

PACKAGE DIAGRAM .........................5

PIN FUNCTION ....................................6

PORT STRUCTURES ..........................9

RESET................................................................ 9

TEST................................................................... 9

XIN, XOUT ........................................................9

OSC1, OSC2 ..................................................... 9

R00~07, R53 ...................................................... 9

R10~15 (AN0~5) ................................................ 9

R16, 17, 20, 24, 25, 26, 27, 52, 67 ................... 10

R21/Sclk, R22/Sout .......................................... 10

R23/Sin ............................................................ 10

R40~43 (PWM0~3) .......................................... 10

R44, 45, 46, 47 (SCL, SDA, PWM) ..................10

R50/BUZZ, R51/PWM8 ........ ......... ................. ..11

R54/YM, R55/YS, R56/I ...................................11

R, G, B ............................................................. 11

ELECTRICAL CHARACTERISTICS . 12

Absolute Maximum Ratings .....................12

Recommended Operating Conditions ....12

DC Electr i cal Characteristics - GM S81C404 0

.....................................................................12

A/D Comparator Characteristics .............14

AC Characteristics ....................................14

Typical Characteristics ............................16

MEMORY ORGANIZATION .............. 17

Registers ...................................................17

Program Memory ........ ............... .............. .20

PCALL→ rel ..................................................... 21

TCALL→ n ....................................................... 21

Data Memory ........ ............... .............. ........23

User Memory .................................................... 23

Control Registe rs ........................................... ..23

Stack Area ........................................................23

Addressing Mode ......................................25

(1) Register Addressing ...................................25

(2) Immediate Addressing → #imm .................. 25

(3) Direct Page Addressing → dp ....... .............. 25

(4) Absolute Addressing → !abs ....................... 25

(5) Indexed Addressing .................................... 26

X indexed direct page (no offset) → {X} ...........26

X indexed direct page, auto increment→ {X}+ . 26

X indexed direct page (8 bit offset) → dp+X .....26

Y indexed direct page (8 bit offset) → dp+Y .....27

Y indexed absolute → !abs+Y ..........................27

Direct page indirect → [dp] ...............................27

X indexed indirect → [dp+X] ............................. 27

Y indexed indirect → [dp]+Y ............................. 28

Absolute indirect → [!abs] ................................28

I/O PORTS ......................................... 29

Registers for Port .............. .............. .........29

Port Data Registers ..........................................29

I/O Ports Configuration ............................3 0

R0 Ports ...........................................................30

R1 Ports ...........................................................30

R2 Port .............................................................31

R4 Port .............................................................31

R5 Port .............................................................32

R6 Port .............................................................32

CLOCK GENERATOR ...................... 33

TIMER ................................................ 34

Basic Interval Timer .................................34

Timer 0, 1 ................. .............. ............... .....35

Timer / Event Counter 2, 3 ....... ............... .37

Timer Mode ...................................................... 39

Event counter Mode ......................................... 39

A/D Converter ................................... 42

Control ..............................................................42

Serial I/O ........................................... 44

Control ..............................................................44

Pulse Width Modulation (PWM) ...... 46

8bit PWM Control ............................................. 47

14bit PWM Control ........................................... 47

Interrupt interval measurement circuit

........................................................... 49

Control ..............................................................49

Buzzer driver .................................... 51

Control ..............................................................51

On Screen Display (OSD) ................ 53

OSDCON1 ....................................................... 55

OSDCON2 ....................................................... 55

OSDPOL .......................................................... 56

FDWSET .......................................................... 56

L1ATTR ............................................................ 57

L1VPOS ........................................................... 58

L2ATTR ............................................................ 58

L2VPOS ........................................................... 58

COLMOD ......................................................... 58

MESHCON ....................................................... 58

VRAM ...............................................................58

Font ROM .........................................................60

GMS81C4040/87C4060

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Sprite RAM ....................................................... 60

Test Font ..........................................................61

I2C Bus Interface ..............................62

Control .......... ................. ................ ................. ..62

I2C address register ......................................... 62

I2C data shift register [ICDR] ........................... 63

I2C status register ............................................63

I2C control register 1 ........................................ 64

I2C control register 2 ........................................ 64

START condition generation ............................ 65

RESTART condition generation ....................... 65

STOP condition generation .............................. 65

START / STOP condition detect ...................... 66

Address data communication ........................... 67

INTERRUPTS .................................... 68

Interrupt Mode Register ...................................68

Interrupt Sequence ......... .............. ............72

Interrupt acceptance ........................................72

Saving/Restoring General-purpose Register ... 73

Multi Interrupt ............................................74

External Interrupt .............. .............. .........75

Response Time ........... .......... ................ ........... 75

WATCHDOG TIMER ......................... 76

Watchdog Timer Control ..................................76

Enable and Disable Watchdog .........................77

Watchdog Timer Interrupt ................................77

Minimizing Current Consumption ..................... 78

OSCILLATOR CIRCUIT .................... 80

RESET ............................................... 81

External Reset Input ................. ............... .81

Watchdog Timer Reset ............................82

OTP Programming ........................... 83

GMS87C4060 OTP Programming ............83

.Device configuration data ......................84

Timing Chart .............................................87

Assemble mnemonics ..................... 89

Instruction Map ............................. ............89

Alphabetic order table of instruction .....90

Instruction Table by Function .................94

PRELIMINARY

GMS81C4040/87C4060

Nov. 1999 Ver 1.0

PRELIMINARY

1

GMS81C4040/GMS87C4060

CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

FOR TELEVI SI ON

1. OVERVIEW

1.1 Description

The GMS81C4040/GMS87C4 060 is an adva nced CMOS 8-bi t micro control le r with 40K( 60K) bytes of ROM. T he device i s
one of GMS800 family. The HYUNDAI’s GMS81C4040/GMS87C4060 is a powerful microcontroller which provides a
highly flexible and cost effectiv e solution to many TV applications. The GMS81C4040/GMS87C4060 provides t he follow­ing standard features: 40K(60K) bytes of ROM, 1,536 bytes of RAM, 8-bit timer/counter .

1.2 Features

• 40K(60K) Bytes On-chip Program Memory

• 1,536 Bytes of On-chip Data RAM

(Included 256 bytes stack memory)

• Instruction Cycle Time (ex:NOP)

- 0.5us at 8MHz

• 40 Program m able I/O pins

- 33 I/O and 7 Outp ut pi ns

• Serial I/O : 8bit x 1ch

•I

2

C Bus interface

- Multimaster (2 Pairs interface pins)

• A/D Converter : 8bit x 6ch (TBD LSB)

• Pulse Width Modulation

- 14bit x 1ch

- 8bit x 6ch

•Timer

- Timer/Counter : 8bit x 4ch (16bit x 2ch)

- Basic interval timer : 8bit x 1ch

- Watch Dog Timer

• Number of Interrupt sources : 18

• On Screen Display

- Number of characters : 512 (6 characters are
reserved for IC test)

- Character size : 12 dots(X) x 16 dots(Y)

- Character display size : Large, Medium, Small

- DIsplay capability : 24Characters x 16 Line
(Two line VRAM buffer)

- Character, Back ground color : 16kinds

- Special functions : Rounding, Outline, Sprite,
Shadow,...

• Buzz er D riv in g port

- 500Hz ~ 250kHz @8MHz (Duty 50%)

• Operating Range : 4.5V to 5.5V

Device name ROM Size RAM Size Package

GMS81C4040

40K bytes

Mask ROM

1,536 bytes 52SDIP

GMS87C4060

60K bytes

EPROM

1,536 bytes 52SDIP

GMS81C4040/87C4060

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1.3 Development Tools

The GMS81C4040/GMS87C4060 is supported by a full­featured macro as sem bler / linker , OSD font editor, an in­circuit emulator CHOICE-Dr

TM

.

In Circuit Emulators

CHOICE-Dr.

(with EVA81C4xxx board)

Assembler / Linker

HYUNDAI’s Macro Assembler /

Linker

Font Editor

MS-Windows GUI version

Debugger

MS-Windows GUI version

PRELIMINARY

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Nov. 1999 Ver 1.0

PRELIMINARY

3

2. BLOCK DIAGRAM

ALU

OSD (On Screen Display) Controller

Accumulator

Interrupt Controller

Data

Memory

OSD

Memory

Display

8-bit x 4
Counter

Timer/

Program

Memory

Vector Table

8-bit Basic

Timer

Interval

Watchdog

Timer

PSW

System controller

Timing generator

System

Clock Controller

RESET

TEST

XIN

XOUT

OSC1
OSC2

R,G,B

VDD

VSS

Power
Supply

R1

Clock generator

& Index X,Y

8bit A/D

Convertor

Buzze r

R5

PWM

14bit x 1

8bit x 6

Da ta b u s

I2C

Interf a c e

R4

Da ta b u s

Serial I/O

Inte rfac e

Interrupt

Interv a l

Measure

R2

R0 R6

Stack pointer

PC

R00
R01
R02
R03
R04
R05
R06
R07

R67 / INT1

R20 / INT2
R21 / Sclk
R22 / Sout
R23 / Sin
R24 / INT3
R25 / EC2
R26 / INT4
R27 / EC3

R40 / PWM0
R41 / PWM1
R42 / PWM2
R43 / PWM3

R44 / SCL0
R45 / SCL1 / PWM4
R46 / SDA0
R47 / SDA1 / PWM5

R10 / AN0
R11 / AN1
R12 / AN2
R13 / AN3
R14 / AN4
R15 / AN5
R16 / VD
R17 / HD

R50 / BUZZ
R51 / PWM8
R52 / INT0
R53

R54 / YM
R55 / YS
R56 / I

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3. PIN ASSIGNMENT

R40/PWM0
R41/PWM1
R42/PWM2
R43/PWM3
R44/SCL0
R45/SCL1/PWM4
R46/SDA0
R47/SDA1/PWM5
R50/BUZZ
R51/PWM8
R52/INT0
R53
Vss
Vdd
TEST
OSC1
OSC2
R54/YM
R55/YS
R56/I
B
G
R
R00
R01
R02

R27/EC3

R26/INT4

R25/EC2

R24/INT3

R23/Sin

R22/Sout

R21/Sclk

R20/INT2

R17/HD
R16/VD

RESET

Vss

Xout

Xin
R15/AN5
R14/AN4
R13/AN3
R12/AN2
R11/AN1
R10/AN0

R07
R06
R05
R04
R03

R67/INT1

52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

HYUNDAI

GMS81C40XX

PRELIMINARY

GMS81C4040/87C4060

Nov. 1999 Ver 1.0

PRELIMINARY

5

4. PACKAGE DIAGRAM

Figure 4-1 52pin Shrink DIP Package Diagram

UNIT: mm

HYUNDAI
GMS81C40XX

1

26

2752

45.97

0.13

0.76

0.13

1.778

0.25

4.38 Max.

13.97

0.25

15.24

0.25

0.47 0.13 1.02 0.25

3.81 0.13

3.24

0.20

0.50 Min.

0.25 0.05

0 ~ 15

GMS81C4040/87C4060

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5. PIN FUNCTION

V

DD

: Supply voltage.

V

SS

: Circuit ground.

TEST

: Used for shipping inspection of the IC. For normal

operation, it should not be connected .

RESET

: Rese t th e MCU.

X

IN

: Input to the inver tin g oscil lator ampli fie r and i nput to

the internal main clock operating circuit.

X

OUT

: Output from the inverting oscillator amplifier.

OSC1

: Input to the internal On Screen Display operating

circuit.

OSC2

: Output from the inverting OSC1 amplifier.

R00~R07

: R0 is an 8-bit CMOS bidi rec tional I/O port. R0
pins 1 or 0 written to the Port Direction Register can be
used as outputs or inpu ts.

R10~R17

: R1 is an 8-bit CMOS bidi rec tional I/O port. R1
pins 1 or 0 written to the Port Direction Register can be
used as outputs or inpu ts.

In addition, R1 serves the functions of the various follow­ing special features.

R20~R27

: R2 is a 8-bit CMOS bidi rectional I/O por t. Each
pins 1 or 0 written to the their Port Direction Register can
be used as outputs or inputs.

In addition, R2 serves the functions of the various follow­ing special features.

R40~R47

: R40~R43 are 8-bit NM OS open drain output
and R45~R47 are bidirec tional CMOS Input / NMOS open
drain output port. R4 pins 1 or 0 written to the Port Direc­tion Registe r can be used as outputs or inputs .

In addition, R4 serves the functions of the various follow­ing sp ec ial featu r es.

R50~R56

: R50~R53 are 4-bi t CMOS bidire ctional I/ O and
R54~R56 are CMOS output port. R5 p ins 1 or 0 written to
the Port Direction Register can be used as outputs or in­puts.

In addition, R5 serves the functions of the various follow­ing sp ec ial featu r es.

R67

: R67 is an 1- bit CMOS bidirection al I/O port. R67
pins 1 or 0 written to the Port Direction Register can be
used as outputs or inputs.

In addition, R67 serves the functions of the vario us follow­ing sp ec ial featu r es.

R,G,B

: R,G,B CMOS outpu t port. E ach pin s cont rols Re d,

Green,. Blue color co ntrol.

Port pin Alternate funct ion

R10
R11
R12
R13
R14
R15
R16
R17

AN0 (A/D converter input 0)
AN1 (A/D converter input 1)
AN2 (A/D converter input 2)
AN3 (A/D converter input 3)
AN4 (A/D converter input 4)
AN5 (A/D converter input 5)
VD (Vertical Sync. input)
HD (Horisontal Sync. input)

Port pin Alternate funct ion

R20
R21
R22
R23
R24
R25
R26
R27

INT2 (External interrupt input 2)
Sclk (Serial communication clock)
Sout (Serial communication data out)
Sin (Serial communi cation data in)
INT3 (External interrupt input 3)
EC2 (Event counter in put 2)
INT4 (External interrupt input 4)
EC3 (Event counter in put 3)

Port pin Alternate function

R40
R41
R42
R43
R44
R45

R46
R47

PWM0 (Pulse Width Modul ation output 0)
PWM1 (Pulse Width Modul ation output 1)
PWM2 (Pulse Width Modul ation output 2)
PWM3 (Pulse Width Modul ation output 3)

SCL0 (I

2

C Clock 0)

SCL1 (I

2

C Clock 1)

PWM4 (Pulse Width Modul ation output 4)
SDA0 (I

2

C Data 0)

SDA1 (I

2

C Data 1)

PWM5 (Pulse Width Modul ation output 5)

Port pin Alternate function

R50
R51
R52
R54
R55
R56

BUZZ (Buzzer output)
PWM8 (Pulse Width Modul ation output 8)
INT0 (External int errupt input 0)
YM (Back ground)
YS (Edge)
I (Intencity)

Port pin Alternate function

R67 INT1 (External int errupt input 1)

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Nov. 1999 Ver 1.0

PRELIMINARY

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PIN NAME Pin No. In/Out Function

V

DD

39 - Supply voltage

V

SS

12, 40 - Circuit ground

TEST

38 I For test purposes. Should not be connected. (N.C.)

RESET

11 I Reset signal input

X

IN

14 I Main oscillation input

X

OUT

13 O Main oscillation output

OSC1 37 I

On screen display functions

On screen display oscillation input
OSC2 36 O On screen display osc. output
R17/HD 9 I/O Horisontal Sync. input
R16/VD 10 I/O Vertical Sync. input
R 30 O Red signal output
G 31 O Green signal output
B 32 O Blue signal output
R56/I 33 O Intencity sign al output
R55/YS 34 O Edge signal output
R54/YM 35 O Background signal output
R40/PWM0 52 O

PWM functions

8bit PWM
R41/PWM1 51 O 8bit PWM
R42/PWM2 50 O 8bit PWM
R43/PWM3 49 O 8bit PWM
R45/SCL1/

PWM4

47 I/O

Include I

2

C Serial clock 1 (SCL1)

R47/SDA1/
PWM5

45 I/O

Include I

2

C Serial data 1 (SDA1)

R51/PWM8 43 I/O 14bit PWM
R44/SCL0 48 I/O

I

2

C functions

I

2

C Serial clock 0

R46/SDA0 46 I/O

I

2

C Serial data 0

R23/Sin 5 I/O

SCI functions

Serial data input
R22/Sout 6 I/ O Ser ial data output
R21/Sclk 7 I/O Serial communication clock
R27/EC3 1 I/O

Timer event functions

Event counter input 3
R25/EC2 3 I/O Event counter input 2
R50/Buzzer 44 I /O Buzzer function 500Hz ~ 250KHz @8MHz

Table 5-1 Port Function Description

GMS81C4040/87C4060

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R52/INT0 42 I/O

External interrupt functions

External interrupt input 0
R67/INT1 26 I/O External interrupt input 1
R20/INT2 8 I/O External interrupt input 2
R24/INT3 4 I/O External interrupt input 3
R26/INT4 2 I/O External interrupt input 4
R10/AN0 20 I/O

A/D conversion functions

Analog input 0
R11/AN1 19 I/O Analog input 1
R12/AN2 18 I/O Analog input 2
R13/AN3 17 I/O Analog input 3
R14/AN4 16 I/O Analog input 4
R15/AN5 15 I/O Analog input 5
R00 29 I/O

Digital I/O functions

R01 28 I/O
R02 27 I/O
R03 25 I/O
R04 24 I/O
R05 23 I/O
R06 22 I/O
R07 21 I/O
R53 41 I/O

PIN NAME Pin No. In/Out Function

Table 5-1 Port Function Description

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6. PORT STRUCTURES

RESET

TEST

XIN, X

OUT

OSC1, OSC2

R00~07, R53

R10~15 (AN0~5)

RESET

V

DD

V

SS

Noise

Canceler

V

DD

V

SS

X

IN

X

OUT

V

SS

V

DD

V

SS

V

DD

Main frequency
clock

V

SS

OSDON

OSC1

OSC2

V

SS

V

DD

V

SS

V

DD

Main frequency
clock

Pin

Data Reg.

Dir. Reg.

DB

DB

DB

MUX

RD

V

DD

V

SS

Pin

Data Reg.

Dir. Reg.

DB

DB

DB

MUX

RD

V

DD

V

SS

AN0~5

GMS81C4040/87C4060

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R16, 17, 20, 24, 25, 26, 27, 52, 67

R21/Sclk, R22/So ut

R23/Sin

R40~43 (PWM0~3)

R44, 45, 46, 47 (SCL, SDA, PWM)

Pin

Data Reg.

Dir. Reg.

DB

DB

DB

MUX

RD

V

DD

V

SS

HD,VD,
EC2~3
INT0~INT4

Pin

Data Reg.

Dir. Reg.

DB

DB

DB

MUX

RD

V

DD

V

SS

Sclk

MUX

Sout, Sclk
Selection

Pin

Data Reg.

Dir. Reg.

DB

DB

DB

MUX

RD

V

DD

V

SS

Sin

Selection

Pin

Data Reg.

DB

V

SS

MUX

PWM0~3
Selection

Pin

Data Reg.

Dir. Reg.

DB

DB

DB

MUX

RD

V

SS

SCL, SDA

MUX

PWM4,PWM5
Selection

SCL,SDA

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Nov. 1999 Ver 1.0

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R50/BUZZ, R51/PWM8

R54/YM, R55/YS, R56/I

R, G, B

Pin

Data Reg.

Dir. Reg.

DB

DB

DB

MUX

RD

V

DD

V

SS

MUX

Buzz, PWM8
Selection

Pin

Data Reg.

DB

V

DD

V

SS

MUX
YM, YS, I
Selection

OSD ON or Data Reg Write.

Pin

R, G, B

V

DD

V

SS

i

OSD_ON

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7. ELECTRICAL CHARACTERISTICS

7.1 Absolute Maximum Ratings

Supply voltage...........................................-0.3 to +6.0 V

Storage Temperature ................................-40 to +125 °C

Voltage on any pin with respect to Ground (V

SS

)

............................................................... -0.3 to V

DD

+0.3

Maximum current out of V

SS

pin ........................100 mA

Maximum current into V

DD

pin ............................80 mA

Maximum current sunk by (I

OL

per I/O Pin) ........20 mA

Maximum output current sourced by (I

OH

per I/O Pin)

...... .. .. .......................................................................8 mA

Maximum current (ΣI

OL

)......................................80 mA

Maximum current (ΣI

OH

)......................................50 mA

Note:

Stresses above those listed under "Absolute Maxi­mum Ratings" may cause pe rmanent dam age to the de­vice. This is a stress rating only and functional operation of
the device at a ny other conditio ns above those ind icated in
the operational sections of this specification is not implied.
Exposure to abso lute maximum rati ng conditions for ex­tended periods may aff ect device reliability.

7.2 Recommended Operating Conditions

7.3 DC El ectrical Ch ar acteristi cs - GMS81C4040

(TA=-10~70°C, VDD=4.5~5.5V)

,

Parameter Symbol Condition

Specifications

Unit

Min. Max.

Supply Voltage

V

DD

f

XIN

=8MHz

f

OSC

=16MHz

4.5 5.5 V

Operating Frequency

f

XIN

VDD=4.5~5.5V

48MHz

On Screen Display Oper­ating Frequency

f

OSC

VDD=4.5~5.5V

816MHz

Operating Temperature

T

OPR

-10 70

°

C

Parameter Symbol Condition

Specifications

Unit

Min. Typ. Max.

High level input vol tage

V

IH1

TEST, RESET, Xin, OSC1, R17~16,
R27~20, R47~44, R52, R67

0.8 V

DD

-

V

DD

V

V

IH2

R0, R15~10, R53~50

0.7 V

DD

-

V

DD

V

Low leve l in put vo lta g e

V

IL1

TEST, RESET, Xin, OSC1, R17~16,
R27~20, R47~44, R52, R67

0-

0.12 V

DD

V

V

IL2

R0, R15~10, R53~50 0 -

0.3 V

DD

V

High level output voltage

V

OH

I

OH

= -5mA

R0, R1, R2, R5, R67

V

DD

- 1

--V

I

OH

= -1.2mA

R,G,B

V

DD

- 1

--V

Low level output voltage

V

OL

I

OL

= 5mA

R0, R1, R2, R4, R5, R67, R, G, B

-

-1.0V

Supply current in
ACTIVE mode

I

DD

V

DD

--30mA

PRELIMINARY

GMS81C4040/87C4060

Nov. 1999 Ver 1.0

PRELIMINARY

13

pull-up lekage current

I

RUP

VDD = 5.5v, V

PIN

= 0.4V

TEST

-1.5 -400

µ

A

High input leakage
current

I

IZH

V

DD

= 5.5V, V

PIN

= V

DD

All input, I/O pin s except XIN, OSC1,
R47~40

-5 - 5

µ

A

Low input leakage
current

I

IZL

V

DD

= 5.5V, V

PIN

= 0V

All input, I/O pin s except X

IN

, OSC1,

R47~44

-5 - 5

µ

A

Open drain leakage
current

I

LOZ

V

DD

= 5.5V, V

OH

= VDD, N-ch Tr. off

R47~40

--10µA

RAM data retention
voltage

V

RAMVDD

1.2 - - V

I

2

C port impedance

(I/O Tra n s is to r o ff)

R

BS

V

DD

= 4.5V

,

V

SCL0

= V

SCL1

= 2.25V

V

SDA0

= V

SDA1

= 2.25V
SCL0:SCl1 (R44:R45)
SDA0:SDA1 (R46:R47)

- - 120

Ω

Hysterisis

Vt+ ~

Vt-

TEST

, RESET, Xin, OSC1, R17~16,

R27~20, R47~44, R52, R67

1.0 - - V

Parameter Symbol Condition

Specifications

Unit

Min. Typ. Max.

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Nov. 1999 Ver 1.0

7.4 A/D Comparator Characteristics

(TA=-10~70°C, VDD=5.0V)

7.5 AC Characteristics

(TA=-10~70°C, VDD=5V±10%, VSS=0V)

Parameter Symbol Pins

Specifications

Unit

Min. Typ. Max.

Analog Input Voltage Range

V

AIN

AN0~AN5

V

SS

-

V

DD

V

Accuracy

N

FS

---

ΤΒ∆

LSB

Parameter Symbol Pins

Specifications

Unit

Min. Typ. Max.

Operating Frequency

f

XIN

X

IN

4-8MHz

f

OSC

OSC 8 - 16 MHz

External Clock Pulse Width

t

MCPW

X

IN

62.5 - 125 nS

t

SCPW

S

CLK

0.5 -

µ

S

External Clock Transition Time

t

MRCP,tMFCP

X

IN

- - 20 nS

t

SRCP,tSFCP

S

CLK

- - 20 nS

Oscillation Stabilizing Time

t

ST

XIN, X

OUT

--20mS

Interrupt Pulse Width

t

IW

INT0~4 2 - -

t

SYS

1

RESET Inpu t Width

t

RST

RESET 8--

t

SYS

1

Event Counter Input Pulse
Width

t

ECW

EC2, EC3 2 - -

t

SYS

1

Event Counter Transition Time

t

REC,tFEC

EC2, EC3 - - 20 nS

1. t

SYS

is one of 2/f

XIN

main cloc k operation mode,

PRELIMINARY

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Nov. 1999 Ver 1.0

PRELIMINARY

15

Figure 7-1 Timing Chart

t

MRCP

t

MFCP

X

IN

INT0 ~ 4

0.5V

V

DD

-0.5V

0.2V

DD

0.8V

DD

0.2V

DD

RESET

t

REC

t

FEC

0.2V

DD

0.8V

DD

EC2, EC3

t

IW

t

IW

t

RST

t

ECW

t

ECW

1/f

XIN

t

MCPW

t

MCPW

t

SRCP

t

SFCP

S

CLK

0.5V

V

DD

-0.5V

1/f

SCLK

t

SCPW

t

SCPW

GMS81C4040/87C4060

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16

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Nov. 1999 Ver 1.0

7.6 Typical Characteristics

This data will generate after evaluation.

Not available at this time.

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Nov. 1999 Ver 1.0

PRELIMINARY

17

8. MEMORY ORGANIZATION

The GMS81C4040/GMS87C4060 has separate address
spaces for P rogram memo ry, Data M emory and D isplay
memory. Program memory can only be read, not written
to. It can be up to 40K/60K byte s of Program memo ry.

Data memory can be read and written to up to 1,536 bytes
including the stack area. Font memory has prepared 16K
bytes for OSD.

8.1 Registers

This device has six registers that are the Program Counter
(PC), a Accumulator (A), two index registers (X, Y), the
Stack Pointer (SP), and the Program Status Word (PSW).
The Program Counter consists of 16-bit register .

Figure 8-1 Configuration of Registers

Accumulator:

The Accumulator is the 8-bit general pur­pose register, use d for data opera tio n such as tr ansfer , tem­porary saving, an d conditional judgement, etc.

The Accumulator can be used as a 16-bit register with Y
Register as shown below.

Figure 8-2 Configurati on of YA 16-bit Register

X, Y Registers

: In the addressing mode which uses these
index registers , the regist er contents are a dded to the spec­ified addr ess, which be comes the act ual address. The se
modes are extremely effective for referencing subroutine
tables and memory table s. The index re gisters al so have in­crement, decrement, comparison and data transfer func­tions, and they can be used as simple accumulators.

Stack Pointer

: The Sta ck Poi nte r is an 8-b it re gist er us ed
for occurrence inte rrupts and calling ou t subrouti nes. Stack
Pointer identifies the location in the stack to be accessed

(save or restor e).
Generally, SP is automatically updated when a subroutine

call is executed or an interrupt is accepted. However, if it
is used in excess of the stack area permitted by the data
memory allocating configuration, the user-processed data
may be lost.

The stack can be located at any position within 0100

H

to

01FF

H

of the internal data memory. The SP is not initial­ized by hardware, requiring to write the initial value (the
location wit h whi ch the use of the stac k st arts) by u sing t he
initialization routine. Normally, the initial value of "FF

H

"

is used.

Program Counter

: The Program Counter is a 16-bit wi de
which consists of two 8-bit registers, PCH and PCL. This
counter indicates the address of the next instruction to be
executed. In reset state, the pr o g ram cou n ter has r eset rou­tine address (PC

H

:0FFH, PCL:0FEH).

Program Status Word

: The Program Status Word (PSW)
contains several bits that reflect the current state of the
CPU. The PSW is described in Figure 8-3 . It contains the
Negative flag, the Overflow flag, the Break flag the Half
Carry (for BCD operation), the Interrupt enable flag, the
Zero flag, and the Carry flag.

[Carry flag C]
This flag stores a ny carry o r borro w from the ALU of CPU

A

ACCUMULATOR

X REGISTER

Y REGISTER
STACK PO INT ER

PROGRAM COUNTER
PROGRAM STATUS

WORD

X

Y

SP

PCLPCH

PSW

Two 8-bit Registers can be used as a "YA" 16-bit Register

Y

A

Y A

Caution:
The Stack Pointer must be initialized by software be-

cause its value is un d ef ined aft er RESET.

Example: To initialize the SP

LDX #0FFH
TXSP ; SP ← FF

H

SP

01

Stack Address ( 0100

H

~ 01FFH )

15 087

Hardware fixed

GMS81C4040/87C4060

PRELIMINARY

18

PRELIMINARY

Nov. 1999 Ver 1.0

after an arithmetic operation and is also changed by the
Shift Instruction or Rotate Instruction.

Figure 8-3 PSW (Program Status Wo rd) Register

[Zero flag Z]
This fl ag is set when the re sult of an arith metic op erat ion

or data transfer is "0" and is cleared by any other result.
[Interrupt disable flag I]
This flag enables/disables all interrupts except interrupt

caused by Reset o r software BRK in struction. All inter­rupts are disabled when cleared to "0". This flag immedi­ately becomes "0" when an interrupt is served. It is set by
the EI instruction and cleared by the DI instruction.

[Half carry flag H]
After operation, this is set when there is a carry from bit 3

of ALU or there is borrow from bit 4 of ALU. This bit can
not be set or cleared except CLRV instruction with Over­flow flag (V).

[Break flag B]
This flag is set by software BRK instruct ion to distinguish

BRK from TCA LL instruction with the s ame vector ad­dress.

[Direct page flag G]
This flag a ssigns RAM pa ge for dire ct a ddres sing mode. In

the direct addressing mode, addressing area is from zero
page 00

H

to 0FFH when this flag is "0". If it is set to "1",
addressing area is assigned by DPGR register (address
0F8

H

). It is set by SETG i nstru ction a nd clear ed by CL RG.
[Overflow flag V]
This flag is set to "1" when an overflow occurs as the result

of an arithmetic operation involving signs. An overflow
occurs when the r esult of an add ition or s ubtraction ex­ceeds + 127(7F

H

) or -128(80H). The CLRV instruction
clears the overflow flag. There is no set instruction. When
the BIT instruction is executed, bit 6 of memory is copied
to this flag.

[Nega tiv e f la g N ]
This flag is set to match the sign bit (bit 7) status of the re-

sult of a data or arithmetic operation. When the BIT in­struction is execu ted, bit 7 of memor y is copied to this fla g.

N

NEGATIVE FLAG

V G B H I Z C

MSB LSB

RESET VALUE : 00

H

PSW

OVERFLOW FLAG

BRK FLAG

CARRY FLAG RECEIVES

ZERO FLAG

INTERRUPT ENABLE FLAG

CARRY OUT

HALF CARRY FLAG RECEIVES
CARRY OUT FROM BIT 1 OF

ADDITION OPERLANDS

SELECT DIRECT PAGE

when G=1, page is addressed by RPR

PRELIMINARY

GMS81C4040/87C4060

Nov. 1999 Ver 1.0

PRELIMINARY

19

Figure 8-4 Stack Operation

At execution of
a CALL/TCALL/PCALL

PCL
PCH

01FF

SP after
execution

SP before
execution

01FD

01FE

01FD

01FC

01FF

Push
down

At acceptance
of interrupt

PCL
PCH

01FF

01FC

01FE

01FD

01FC

01FF

Push
down

PSW

At execution
of RET instruction

PCL

PCH

01FF

01FF

01FE

01FD

01FC

01FD

Pop
up

At execution
of RETI instruction

PCL

PCH

01FF

01FF

01FE

01FD

01FC

01FC

Pop
up

PSW

0100H

01FFH

Stack
depth

At execution
of PUSH in struction

A

01FF

01FE

01FE

01FD

01FC

01FF

Push
down

SP after
execution

SP before
execution

PUSH A (X,Y,PSW)

At execution
of POP instruction

A

01FF

01FF

01FE

01FD

01FC

01FE

Pop
up

POP A (X,Y,PSW)

GMS81C4040/87C4060

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8.2 Program Memory

A 16-bit program counter is capable of addressing up to
64K bytes, but GMS81C4040/GMS87C4060 has 40K/
60K bytes program memory space only physically imple­mented. Accessing a location above FFFF

H

will cause a

wrap-around to 0000

H

.

Figure 8-5 , shows a map of Pro gram Memory. Aft er reset,
the CPU begins e xecution from reset vect or which is stored
in address FFFE

H

and FFFFH as shown in Figure 8-6 .

As shown in Figure 8-5 , each area is assigned a fixed lo­cation in Program Memory. Progr am Memory area c on­tains the user program.

Figure 8-5 Program Memory Map

Page Call (PCALL) area contains subroutine program to
reduce program byte length by using 2 bytes PCALL in­stead of 3 bytes CALL instr uction. If it is frequent ly called ,
it is more useful to save program byte length.

Table Call (TCALL) causes the CPU to jump to each
TCALL address, where it commences the execution of the
serv ic e r ou t in e. Th e Tab l e Call servic e area space s 2 - b y te
for every TCALL: 0FFC0

H

for TCALL15, 0FFC2H for

TCALL14, etc., as shown in Figure 8-7 .

Example: Usage of TCALL

The in terrup t cau s es the CP U to ju m p to s p ec if ic loca t i on ,
where it comm ence s the ex ecuti on of th e serv ice ro utine.
The External interrupt 0, for example, is assigned to loca­tion 0FFFC

H

. The in terr up t se rvic e lo catio ns spa ces 2-by te

interval: 0FFF8

H

and 0FFF9H for Ex terna l Interr upt 1,

0FFFC

H

and 0FFFDH for External Interrupt 0, etc.

Any area from 0FF00

H

to 0FF FFH, if it is not going to be
used, its service location is available as general purpose
Program Memory.

Figure 8-6 Interr upt Vector Area

PROGRAM

MEMORY

TCALL

AREA

INTERRUPT

VECTOR AREA

81C4040:6000H

FEFFH
FF00H

FFC0H
FFDFH

FFE0H
FFFFH

PCALL

AREA

81C4060:1000H

FFBFH

LDA #5
TCALL 0FH ;

1BYTE INSTRUCTION

:;

INSTEAD OF 2 BYTES

:;

NORMAL CALL

;
;TABLE CALL ROUTINE
;
FUNC_A: LDA LRG0

RET
;
FUNC_B: LDA LRG1

RET
;
;TABLE CALL ADD. AREA
;

ORG 0FFC0H ;

TCALL ADDRESS AREA

DW FUNC_A

DW FUNC_B

1

2

0FFE0

H

E2

Address Vector Area Memory

E4
E6
E8
EA
EC
EE
F0

F2
F4
F6
F8
FA
FC
FE

I

2

C Bus Interface Interrupt Vector Area

Serial I/O Interrupt Vector Area

Basic Interval Timer Interrupt Vector Area

Watchdog Timer Interrupt Vector Area

Timer/Counter 3 Interrupt Vector Area
Timer/Counter 1 Interrupt Vector Area

V-Sync Interrupt Vector Area

Timer/Counter 2 Interrupt Vector Area
Timer/Counter 0 Interrupt Vector Area

External Interrupt 2 Vector Area

On Screen Display Interrupt Vector Area

External Interrupt 0 Vector Area

RESET Vector Area

External Interrupt 1 Vector Area

1 Frame Timer Interrupt Vector Area

External Interrupt 3/4 Vector Area

"-" means reserved area.

NOTE:

PRELIMINARY

GMS81C4040/87C4060

Nov. 1999 Ver 1.0

PRELIMINARY

21

Figure 8-7 PCALL and TCALL Memory Area

PCALL→

→ →

→ rel

4F35 PCALL 35H

TCALL →

→ →

→ n

4A TCALL 4

0FFC0

H

C1

Address Program Memory

C2
C3
C4
C5
C6
C7
C8

0FF00

H

Address PCALL Area Memory

0FFBF

H

PCALL Area

(192 Bytes)

* means that the BRK software interrupt is using
same address with TCALL0.

NOTE:

TCALL 15

TCALL 14

TCALL 13

TCALL 12

TCALL 11

TCALL 10

TCALL 9

TCALL 8

TCALL 7

TCALL 6

TCALL 5

TCALL 4

TCALL 3

TCALL 2

TCALL 1

TCALL 0 / BRK *

C9
CA
CB
CC
CD
CE
CF

D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
DA
DB
DC
DD
DE
DF

4F

~

~

~

~

Sub-routine

35

0FF35H

0FF00H

0FFFFH

Upper address is
assumed 0FF

H.

11111111

11010110

01001010

PC:

FHFHDH6

H

4A

~

~

~

~

25

0FFD6H

0FF00H

0FFFFH

D1

Sub-routine

0FFD7H

þ

À

Ã

0D125H

Reverse

GMS81C4040/87C4060

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22

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Nov. 1999 Ver 1.0

Example: The usage software example of Vector address and the initialize part.

ORG 0FFE0H
DW I2C ; I2C

DW SERIAL ; Serial I/ O
DW BIT ; Basic interval timer
DW WATCHDOG ; Watch dog timer
DW INT3_4 ; Interrupt 3/4
DW TIMER3 ; Timer 3
DW TIMER1 ; Timer 1
DW VSYNC ; Vertica l Sy nc .
DW One_Frame ; 1 Frame interrupt
DW TIMER2 ; Timer 2
DW TIMER0 ; Timer 0
DW INT2 ; Interrupt 2
DW INT1 ; Interrupt 1
DW OSD ; On Screen Display
DW INT0 ; Interrupt 0
DW RESET ; Reset

ORG 0F000H

;****** ** ** ** ****** ** *** ** ** ************* ** **
; MAIN PROGRAM *
;********************************************
;
RESET: DI ; Disable All Interrupts

LDX #0
LDA #0 ; RAM Clear(!0000H->!00BFH)

RAM_CLR: STA {X}+

CMPX #0C0H
BNE RAM_CLR

;

CALL LCD_CLR ; Clear LCD display memory

;

LDX #03FH ; Stack Pointer Initialize
TXSP

LDM R0, #0 ; Normal Port 0
LDM R0DD,#1000_0010B ; Normal Port Direction
:
:
:
:

PRELIMINARY

GMS81C4040/87C4060

Nov. 1999 Ver 1.0

PRELIMINARY

23

8.3 Data Memory

Figur e 8- 8 sho w s th e i nt er n a l D at a M emory sp ac e av aila­ble. Data Memory is di vided into four groups, a user RAM,
control registers, Stack, and OSD memory.

Figure 8-8 Data Memory Map

User Memory

The GMS81C4040/GM S87C4060 has 1,536 × 8 bits for
the user memory (RA M ).

Control Registers

The control registers are used by the CPU and Peripheral
function blocks for controlling the desired operat ion of the
device. Theref ore these regis ters contai n contr ol a nd sta tus
bits for the interru p t system, th e timer/ coun ters, analog to
digital conv ert ers and I /O po rts. The ba sic co ntro l regis t ers
are in address range of 00C0

H

to 00FFH. And OSD control

registers are assigned within 0AE0

H

~ 0AFFH.

Note that unoccupied addresses may not be implemented
on the chip . Re ad ac ce sse s to t hese add ress es w ill in g en­eral return random data, and write accesses will have an in­determinate effect.

More detailed informations of each register are explained
in each peripheral section.

Note:

Write only registers can not be accessed by bit ma­nipulation inst ruct ion . Do not use read- modi fy-wr ite i nstruc ­tion. Use byte manipulation instruction.

Example; To write at CKCTLR

LDM CLCTLR,#09H ;Divide ratio ÷8

Stack Area

The stack pro vides the area where the return address is
saved before a jump is performed du ring the pro cessing
routine at the execution of a subroutine call instruction or
the acceptance of an in terrupt.

When returning from the processing routine, executing the
subroutine re turn inst ruction [RET ] restores t he contents of
the program counter fro m the stack; executing the int errupt
return instruction [RETI] restores the contents of the pro­gram counter and flags.

The save/restore locations in the stack are determined by
the stack pointed (SP). The SP is automatically decreased
after the saving, and increased before the restoring. This
means the value of the SP indicates the stack location
number for the next save. Refer to Figure 8-4 on page 19.

Page0

RAM (192 bytes)

Peripheral Reg. (64 bytes)

0100H

00C0H

0000H

RAM (256 bytes)

0200H

RAM (256 bytes)

0300H

RAM (256 bytes)

0400H

RAM (256 bytes)

0500H

RAM (256 bytes)

0600H

RAM (64 bytes)

0A00H

OSD RAM (192 bytes)

0AE0H

Peripheral Reg. (32 bytes)

0C00H

Sprite RAM (96 bytes)

Empty area

Page1

Page2

Page3

Page4

Page5

Page6

PageA

PageC

063FH

Stack area

0C5FH

Address Symbol R/W Reset Value

Addressing

mode

00C0H
00C1H
00C2H
00C3H
00C4H
00C5H
00C8H
00C9H
00CAH

00CBH
00CCH
00CDH
00CEH
00CFH

R0

R0DD

R1

R1DD

R2

R2DD

R4

R4DD

R5

R5DD

R6

R6DD
FUNC1
FUNC2

R/W

W

R/W

W

R/W

W

R/W

W

R/W

W

R/W

W
W
W

????????
00000000
????????
00000000
????????
00000000
????????
0000---­????????

----0000
?------­0-------

-0000000

---00000

byte, bit

1

byte

2

byte, b it

byte

byte, b it

byte

byte, b it

byte

byte, b it

byte

byte, b it

byte
byte
byte

Table 8-1Control reg isters

GMS81C4040/87C4060

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24

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Nov. 1999 Ver 1.0

0D0H
0D1H
0D2H
0D3H
0D4H
0D5H
0D6H

0D7H
0D8H

0D9H
0DAH
0DBH
0DCH
0DEH
0DFH

TM0

TM2
TDR0
TDR1
TDR2
TDR3

BITR

CKCTLR

WDTR

ICAR
ICDR

ICSR
ICCR1
ICCR2

SIOM

SIOR

R/W
R/W
R/W
R/W
R/W
R/W

R
W
W

R/W
R/W
R/W
R/W
R/W
R/W
R/W

-0000000

-0000000
????????
????????
????????
????????
????????

--010111

-0111111
00000000
11111111
0001000­00000000
00000000

-0000001
????????

byte

byte
byte, bi t
byte, bi t
byte, bi t
byte, bi t

byte

byte

byte
byte, bi t
byte, bi t
byte, bi t
byte, bi t
byte, bi t
byte, bi t
byte, bi t

0E0H
0E1H
0E2H
0E3H
0E4H
0E5H
0E8H

0E9H
0EAH
0EBH
0EEH

0EFH

PWMR0
PWMR1
PWMR2
PWMR3
PWMR4
PWMR5
PWM8H

PWM8L
PWMCR1
PWMCR2

BUR

AIPS

W
W
W
W
W

W
R/W
R/W
R/W
R/W

W

W

????????
????????
????????
????????
????????
????????
????????

--??????
00000000

--0-0000
????????

--000000

byte
byte
byte
byte
byte

byte
byte, bi t
byte, bi t
byte, bi t
byte, bi t

byte

byte

0F0H
0F1H
0F2H
0F3H
0F4H
0F5H
0F6H
0F7H
0F9H
0FAH

0FBH
0FCH
0FDH

ADCM

ADR

IEDS

IMOD

IENL
IRQL
IENH

IRQH

IDCR

IDFS

IDR

DPGR

TMR

R/W

R

W
R/W
R/W
R/W
R/W
R/W
R/W

R
R

R/W

W

--011101
????????

--000000

--000000
0000000­0000000­00000000
00000000
0000-000
1----001
????????

----0000
????????

byte, bi t

byte

byte
byte, bi t
byte, bi t
byte, bi t
byte, bi t
byte, bi t
byte, bi t

byte

byte
byte, bi t

byte

0AE0H
0AE1H
0AE2H
0AE3H
0AE4H
0AE5H
0AE6H
0AE8H
0AE9H

0AF0H
0AF1H
0AF3H
0AF4H

OSDcon1
OSDcon2

OSDPOL
FDWSET

EDGEcol

OSDLN

LHPOS
SPVPOS
SPHPOS

L1ATTR

L1VPOS

L2ATTR

L2VPOS

R/W
R/W

W
W
W

R
W
W
W
W
W
W
W

00000000

-0000000
????????
01111010
10000111

---00000
????????
????????
????????
????????
????????
????????
????????

byte, bi t
byte, bi t

byte
byte
byte
byte
byte
byte
byte
byte
byte
byte
byte

Table 8-1Control registers

1. "byte, bit" means that register can be addressed by not only bit
but byt e manipulation instruction.

2. "byte" means that register can be addressed by only byte
manipulation instruction. On the other hand, do not use any
read-modify-write instruction such as bit manipulation for clear­ing bit .

PRELIMINARY

GMS81C4040/87C4060

Nov. 1999 Ver 1.0

PRELIMINARY

25

8.4 Addressing Mode

The GMS800 series uses six addressing modes;

• Register addressing

• Immediate addressing

• Direct page addressing

• Absolute addressing

• Indexed addressing

• Register-indirect addressing

(1) Register Addressing

Register addressin g accesses the A, X, Y, C and PSW.

(2) Immediate Addressing →

→ →

→ #imm

In this mode, second byte (operand) is accessed as a data
immed iatel y.

Exam ple:

FE10: 0435 ADC #35H

When G-flag is 1, then RAM address is defined by 16-bit
address which is composed of 8-bit direct page accessable
register (DPGR) and 8-bit immediate data.

Example: G=1, DPGR=0CH

F100: E45535 LDM 35H,# 55H

(3) Direct Page Addressing →

→ →

→ dp

In this mode, a address is specified within direc t page.
Example; G=0

E551: C5 35 LDA 35H;A ←RAM[35H]

(4) Absolute Addressing →

→ →

→ !abs

Absolute addr essing sets corr esponding memor y data to
Data , i.e. second byte(Operand I) of command becomes
lower level address and third byte (Operand II) becomes
upper level address.
With 3 bytes command, it is possible to access to whole
memory area.

ADC, AND, CMP, CMPX, CMPY, EOR, LDA, LDX,
LDY, OR, SBC, STA, STX, STY

Example;

F100: 07 35 F0 ADC!0F 035H ;A ←ROM[0F035H]

35

A+35H+C → A

04

MEMORY

0FE10

H

E4

0F100

H

data

←

55H

~

~

~

~

data

0C35

H

þ

35

0F102

H

550F101

H

A

data

35

35

H

0E551

H

data → A

À

þ

~

~

~

~

C5

0E550

H

07

0F100

H

~

~

~

~

data0F035

H

P

F0

0F102

H

350F101

H

A

A+data+C → A

address: 0F035

GMS81C4040/87C4060

PRELIMINARY

26

PRELIMINARY

Nov. 1999 Ver 1.0

The operation within data memory (RAM)
ASL, BIT, DEC, INC, LSR, ROL, ROR

Exam ple; A dd res sing ac cesses t he a ddre ss 0 135

H

regard-

less of G-flag and DPGR.

F100: 983501 INC!0135H ;A ←ROM[135H]

(5) Indexed Addressing
X indexe d di rec t pa g e (no of f set ) →

→ →

→ {X}

In this mode, a address is specified by the X register.
ADC, AND, CMP, EOR, LDA, OR, SBC, STA, XMA
Example; X=15

H

, G=1, DPGR=03

H

E550: D4 LDA {X};ACC←RAM[X].

X indexed direct page, auto increment→

→ →

→ {X}+

In this mode, a address is specified within direct page by
the X register and the content of X is increased by 1.

LDA, STA
Example; G=0, X=35

H

F100: DB LDA {X}+

X indexed direct page (8 bit offset) →

→ →

→ dp+X

This address value is the second byte (Operand) of com­mand plus the data of -register. And it assigns the mem­ory in Direct page.

ADC, AND, CMP, EOR , LDA, LDY, OR, SBC, STA
STY, XMA, ASL, D EC, INC, LSR, ROL, RO R

Example; G=0, X=0F5

H

E550: C6 45 LDA 45H+X

98

0F100

H

~

~

~

~

data135

H

þ

01

0F102

H

350F101

H

À

data+1 → data

Ã

address: 0135

data

D4

315

H

0E550

H

data → A

À

þ

~

~

~

~

data

DB

35

H

data → A

À

þ

~

~

~

~

36H → X

0F100

H

data

45

3A

H

0E551

H

data → A

À

þ

~

~

~

~

C6

0E550

H

45H+0F5H=13AH

Ã