HEI GMS81524BTQ, GMS81524BTLQ, GMS81524BTK, GMS81524BQ, GMS81524BLQ Datasheet

HYUNDAI MICRO ELECTRONICS

8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81508B
GMS81516B
GMS81524B

User’s Manual (Ver. 1.04)

+<81'$,

Semiconductor Group of Hyundai Electronics Industrial Co., Ltd.

MicroElectronics

Version 1.04
Published by

MCU Application Team

1999 HYUNDAI Micro Electronics All right reserved.



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 reserves 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 co rrect and reliable; ho wever, 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.

HYUNDAI MicroElectronics GMS81508B/16B/24B

Table of Contents

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

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

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

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

Ordering Information ..........................................2

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

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

4. PACKAGE DIAGRAM............................6

5. PIN FUNCTION......................................8

6. PORT STRUCTURES..........................10

7. ELECTRICAL CHARACTERISTICS....12

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

Recommended Operating Conditions ..............12

A/D Converter Characteristics .........................12

DC Electrical Characteristics ............ ...... ....... ..1 3

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

Serial Interface Timing Characteristics ............15

Typical Characteristic Curves ..........................16

8. MEMORY ORGANIZATION.................18

Registers ....................... ...................................18

Program Memory ....................... ....... ...............21

Data Memory ...................................................24

Addressing Mode .............................................27

9. I/O PORTS...........................................31

10. BASIC INTERVAL TIMER..................34

11. TIMER/EVENT COUNTER................36

8-bit Timer / Counter Mode ..............................38

16-bit Timer / Counter Mode ............................42

8-bit Capture Mode ..........................................43

16-bit Capture Mode .................. ....... ...... ....... ..4 4

12. ANALOG DIGITAL CONVERTER......46

13. SERIAL COMMUNICATION..............48

Transmission/Recei vi ng Timi ng ........... ........... 50

The Serial I/O operation by SRDY pin ............ 50

The method of Serial I/O ................................. 51

The Method to Test Correct Transmission ...... 51

14. PWM OUTPUT ..................................52

15. BUZZER FUNCTION.........................55

16. INTERRUPTS....................................57

Interrupt Sequence .......................................... 59

BRK Interrupt .................................................. 60

Multi Interrupt .................................................. 61

External Interrupt ............................................. 61

17. WATCHDOG TIMER .........................64

18. POWER DOWN OPERATION...........66

STOP Mode .................................................... 66

Minimizing Current Consumption .................... 67

19. OSCILLATOR CIRCUIT.....................69

20. RESET...............................................70

External Reset Input ........................................ 70

Watchdog Timer Reset ................................... 70

21. POWER FAIL PROCESSOR.............71

22. OTP PROGRAMMING.......................73

How to Program .............................................. 73

Pin Function .................................................... 73

Programming Specification ............................. 76

A. CONTROL REGISTER LIST..................i

B. SOFTWARE EXAMPLE....................... iii

7-segment LED display ....................................iii

C. INSTRUCTION....................................viii

Terminology List ..............................................viii

Instruction Map ..................................................ix

Instruction Set ....................................................x

D. MASK ORDER SHEET......................xvi

DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

GMS81508B/16B/24B

CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

WITH A/D CONVERTER

1. OVERVIEW

1.1 Description

The GMS81508B/16B/24B are advanced CMOS 8-bi t microcon trollers with 8K/16K/24K byt es of ROM. The device is on e
of GMS800 family. This device using the GMS800 family CPU includes several peripheral functions such as Timer, A/D
converter, Programmable buzzer driver, Serial I/O communication, Pulse Width Mod ulation function, etc. The RAM, ROM,
and I/O are placed on the same memory map in addition to simple instruction set.
The GMS815xxB is functi onall y 10 0% com pati ble wit h earie r GMS81508/16 or GMS81508A/16A, h owever bet t er charac­teristics have such as strong EMS, wide operating voltage, temperature, frequency and fast programming time for the OTP.

Device name ROM Size RAM Size OTP Package

GMS81508B 8K bytes 448 bytes GMS81516BT
GMS81516B 16K bytes 448 bytes GMS81516BT
GMS81524B 24K bytes 448 bytes GMS81524BT

64SDIP, 64MQFP,
64LQFP

1.2 Features

• 8K/16K/24K Bytes On-chip Program Memory

• 448 Bytes of On-chip Data RAM
(Included stack memory)

• Minimum Instruction Execution Time

0.5

s at 8MHz

µµµµ

• One 8-bit Basic Interval Timer

• Four 8-bit Timer/Event counter
or Two 16-bit Timer/Event counter

• One 6-bit Watchdog timer

• Eight channel 8-bit A/D converter

• Two channel 8-bit PWM

• One 8-bit Serial Communication Interface

• Four External Interrupt input ports

• Buzzer Driving port

- 500Hz ~ 250kHz@8MHz

• 52 I/O Ports, 4 Input Ports

• Twelve Interrupt sources

- Basic Interval Timer: 1

- External input: 4

- Timer/Event counter: 4

- ADC: 1

- Serial Interface: 1

- WDT: 1

• Built in Noise Immunity Circuit

- Noise filter

- Power fail processor

• Power Down Mode

- STOP mode

• 2.2V to 5.5V Wide Operating Range

• 1~10MHz Wide Operating Frequency

• 64SDIP, 64MQFP, 64LQFP package types

• Available 16K, 24K bytes OTP version

DEC. 1999 Ver 1.04 1

GMS81508B/16B/24B HYUNDAI MicroElectronics

1.3 Development Tools

The GMS815xxB are supported by a full-featured macro
assembler, an in-circuit emulator CHOICE-Jr.

TM

and OTP
programmers. There are third different type programmers
such as emulator add-on board type, single type, gang
type. For mode detail, Refer to “22. OTP PROGRAM­MING” on page 73. Macro assembler operates under the
MS-Windows 95/98

TM

.

Please contact sales part of Hyundai MicroElectronics.

1.4 Ordering Information

Device name ROM Size RAM size Package

Mask version

OTP version

GMS81508B K
GMS81508B Q
GMS81508B LQ
GMS81516B K
GMS81516B Q
GMS81516B LQ
GMS81524B K
GMS81524B Q
GMS81524B LQ

GMS81516BT K
GMS81516BT Q
GMS81516BT LQ
GMS81524BT K
GMS81524BT Q
GMS81524BT LQ

8K bytes
8K bytes
8K bytes
16K bytes
16K bytes
16K bytes
24K bytes
24K bytes
24K bytes

16K bytes OTP
16K bytes OTP
16K bytes OTP
24K bytes OTP
24K bytes OTP
24K bytes OTP

448 bytes
448 bytes
448 bytes
448 bytes
448 bytes
448 bytes
448 bytes
448 bytes
448 bytes

448 bytes
448 bytes
448 bytes
448 bytes
448 bytes
448 bytes

64SDIP
64MQFP
64LQFP
64SDIP
64MQFP
64LQFP
64SDIP
64MQFP
64LQFP

64SDIP
64MQFP
64LQFP
64SDIP
64MQFP
64LQFP

2 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

2. BLOCK DIAGRAM

ADC Power
Supply

PSW

System controller

System

Clock Controller

Timing generator

Clock

Generator

AVDDAV

ALU

8-bit Basic

Interval

Watchdog

Timer

Timer

SS

R00~R07

R0

A

X Y

Interrupt Controller

8-bit

Timer/

Counter

R4 R5

R10~R17

Stack Pointer

8-bit serial

Interface

Buzzer

Driver

R1

8-bit PWM

R20~R27

R2

Data Memor y

(448 bytes)

8-bit
ADC

R30~R37

R3

PC

Program

Memory

Data Table

PC

R6

TEST

RESET

IN

X

X

OUT

DD

V

Power
Supply

SS

V

R40 / INT0
R41 / INT1
R42 / INT2
R43 / INT3
R44 / EC0
R45 / EC2
R46 / T1O
R47 / T3O

R50 / SIN
R51 / SOUT
R52 / SCLK
R53 / SRDY
R54 / WDTO
R55 / BUZ
R56 / PWM0
R57 / PWM1

R60 / AN0
R61 / AN1
R62 / AN2
R63 / AN3
R64 / AN4
R65 / AN5
R66 / AN6
R67 / AN7

DEC. 1999 Ver 1.04 3

GMS81508B/16B/24B HYUNDAI MicroElectronics

3. PIN ASSIGNMENT

64SDIP
(Top View)

AN7
AN6
AN5
AN4
AN3
AN2
AN1

AN0
PWM1
PWM0

BUZ

WDTO

SRDY

SCLK

SOUT

SIN
T3O
T1O
EC2
EC0

INT3
INT2
INT1
INT0

V

DD

TEST

AV

SS

AV

DD

R67
R66
R65
R64
R63
R62
R61
R60
R57
R56
R55
R54
R53
R52
R51
R50
R47
R46
R45
R44
R43
R42
R41
R40

RESET

XIN

XOUT

V

SS

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
27
28
29
30
31
32

64
63
62
61
60
59
58
57
56
55
54

GMS81508B/16B/24B

53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33

R30
R31
R32
R33
R34
R35
R36
R37
R00
R01
R02
R03
R04
R05
R06
R07
R10
R11
R12
R13
R14
R15
R16
R17
R20
R21
R22
R23
R24
R25
R26
R27

64MQFP
(Top View)

AN7
AN6

R36
R35
R34
R33
R32
R31
R30
V

DD

TEST
AV

SS

AV

DD

R67
R66

R37

R01

R02

R03

R00

515049

52
53
54
55
56
57
58
59
60
61
62
63
64

484746

123456789

R65

R63

R62

R61

R64

AN5

AN3

AN2

AN1

AN4

R04

R05

R06

R07

R10

R11

R12

R13

45

4443424140

GMS81508B/16B/24B

R60

R57

R56

R55

AN0

PWM1

PWM0

BUZ

39

101112131415161718

R54

R53

R52

R51

SCLK

SOUT

SRDY

WDTO

R14

R15

R16

R17

3837363534

R50

R47

R46

R45

SIN

T3O

T1O

EC2

R20

R44

EC0

R21

33

R22

32

R23

31

R24

30

R25

29

R26

28

R27

27

V

26

SS

XOUT

25

XIN

24
23

RESET
R40

22
21
20

19

R43

INT3

R41
R42

INT0
INT1
INT2

4 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

64LQFP
(Top View)

R00

R01

R02

R03

R04

R05

R06

R07

R10

R11

R12

R13

R14

R15

R16

R17

AN7
AN6
AN5
AN4

R37
R36
R35
R34
R33
R32
R31
R30
V

DD

TEST

AV

SS

AV

DD

R67
R66
R65
R64

484746454443424140393837363534

49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

GMS81508B/16B/24B

123456789

R63

R62

R61

R60

R57

R56

R55

R54

AN3

AN2

AN1

AN0

PWM1

PWM0

BUZ

WDTO

10111213141516

R53

R52

SRDY

SCLK

R51

SOUT

33

32

R20

31

R21

30

R22

29

R23

28

R24

27

R25

26

R26

25

R27

24

V

SS

23

XOUT
XIN

22
21

RESET

20

R40

19

R41

18

R42

17

R43

R50

R47

R46

R45

R44

SIN

T3O

T1O

EC2

EC0

INT0
INT1
INT2
INT3

DEC. 1999 Ver 1.04 5

GMS81508B/16B/24B HYUNDAI MicroElectronics

4. PACKAGE DIAGRAM

64SDIP

UNIT: INCH

2.280

2.260

0.750 Typ.

0.680

0-15

0.660

2

1

.0

0

8

0

.0

°

0

0.205 max.
min. 0.015

0.022

0.016

0.050

0.030

0.070 Typ.

0.140

0.120

64MQFP

18.15

17.65

3.18 max.

24.15

23.65

20.10

19.90

14.10

13.90

SEE DETAIL “A”

0.50

0.35

1.00 Typ.

0.36

0.10

UNIT: MM

0-7

°

1.95
REF

DETAIL “A”

1.03

0.73

0.23

0.13

6 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

64LQFP

12.00 Typ.

10.00 Typ.

1.60 max.

12.00 Typ.

10.00 Typ.

0.38

0.22

0.50 Typ.

SEE DETAIL “A”

1.45

1.35

0.15

0.05

UNIT: MM

0-7

°

1.00
REF

DETAIL “A”

0.75

0.45

DEC. 1999 Ver 1.04 7

GMS81508B/16B/24B HYUNDAI MicroElectronics

5. PIN FUNCTION

V

: Supply voltage.

DD

V

: Circuit ground.

SS

TEST

: Used for Test Mode. For normal operation, it

should be connected to V

RESET
X

: Reset the MCU.

: Input to the inverting oscillator amplifier and input to

IN

DD

.

the internal main clock operating circuit.

X

: Output from the inverting oscillator amplifier.

OUT

R00~R07

: R0 is an 8-bit CMOS bidirectional I/O port. R0
pins 1 or 0 written to the Port Direction Register can be
used as output s or inputs.

R10~R17

: R1 is an 8-bit CMOS bidirectional I/O port. R1
pins 1 or 0 written to the Port Direction Register can be
used as output s or inputs.

R20~R27

: R2 is an 8-bit CMOS bidirectional I/O port. R2
pins 1 or 0 written to the Port Direction Register can be
used as output s or inputs.

R30~R37

: R3 is an 8-bit CMOS bidirectional I/O port. R3
pins 1 or 0 written to the Port Direction Register can be
used as output s or inputs.

R40~R47

: R4 is an 8-bit CMOS bidirectional I/O port. R4
pins 1 or 0 written to the Port Direction Register can be
used as output s or inputs.

In addition, R4 serves the functions of the various follow­ing special features.

used as outputs or inputs.
In addition, R5 serves the functions of the various follow -

ing special features.

Port pin Alternate function

R50
R51
R52
R53
R54
R55
R56
R57

R60~R67

SIN (Serial data input)
SOUT (Serial data output)
SCLK (Serial clock)
SRDY (Serial ready)
WDTO (Watchdog Timer output)
BUZ (Buzzer driver output)
PWM0 (PWM output 0)
PWM1 (PWM output 1)

: R6 is an 8-bit CMOS bidirectional I/O port. R6
pins 1 or 0 written to the Port Direction Register can be
used as outputs or inputs.

In addition, R6 is shared with the ADC input.

Port pin Alternate function

R60
R61
R62
R63
R64
R66
R66
R67

AN0 (Analog Input 0)
AN1 (Analog Input 1)
AN2 (Analog Input 2)
AN3 (Analog Input 3)
AN4 (Analog Input 4)
AN5 (Analog Input 5)
AN6 (Analog Input 6)
AN7 (Analog Input 7)

Port pin Alternate function

R40
R41
R42
R43
R44
R45
R46
R47

R50~R57

: R5 is an 8-bit CMOS bidirectional I/O port. R5

INT0 (External interrupt 0)
INT1 (External interrupt 1)
INT2 (External interrupt 2)
INT3 (External interrupt 3)
EC0

(Event counter input 0)
(Event counter input 2)

EC2
T1O (Timer/Counter 1 output)
T3O (Timer/Counter 3 output)

Note: On the MDS Ch oice, when the M CU is RESET, R60
can not be used digital input port. For more detail, refer to
"9. I/O PORTS" on page 31.

AV

: Supply voltage to the ladder resistor o f ADC cir-

DD

cuit. To enhance the resolution of analog to digital convert­er, use independent power source as well as possible, other
than digital power source.

AV

: ADC circuit ground.

SS

pins 1 or 0 written to the Port Direction Register can be

8 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

PIN NAME In/Out

Function

Basic Alternate

V

DD

V

SS

TEST

- Supply voltage

- Circuit ground

I

Controls test mode of the chip,
For normal operation, it should be connected at VDD.

RESET I Reset signal input
X

X

IN
OUT

I Oscillation input

O Oscillation output
R00~R07 I/O 8-bit general I/O ports
R10~R17 I/O 8-bit general I/O ports
R20~R27 I/O 8-bit general I/O ports
R30~R37 I/O 8-bit general I/O ports
R40 (INT0) I/O (I)

External interrupt 0 input
R41 (INT1) I/O (I) External interrupt 1 input
R42 (INT2) I/O (I) External interrupt 2 input
R43 (INT3) I/O (I) External interrupt 3 input
R44 (EC0
R45 (EC2

) I/O (I) Timer/Counter 0 external input
) I/O (I) Timer/Counter 2 external input

8-bit general I/O ports

R46 (T1O) I/O (O) Timer/Counter 1 output
R47 (T3O) I/O (O) Timer/Counter 3 output
R50 (SIN) I/O (I)

Serial data input
R51 (SOUT) I/O (O) Serial data output
R52 (SCLK) I/O (I/O) Serial clock I/O
R53 (SRDY) I/O (I/O) Receive enable I/O

8-bit general I/O ports

R54 (WDTO) I/O (O) Watchdog timer overflow output
R55 (BUZ) I/O (O) Buzzer driving output
R56 (PWM0) I/O (O)

PWM pulse output
R57 (PWM1) I/O (O)

R60~R63 (AN0~AN3) I (I) General input ports

Analog voltage input
R64~R67 (AN4~AN7) I/O (I) General I/O ports

AV
AV

SS
DD

- Groun d level input pin for ADC

- Supply voltage input pin for ADC

Table 5-1 Port Function Description

DEC. 1999 Ver 1.04 9

GMS81508B/16B/24B HYUNDAI MicroElectronics

MUX

Data Bus

V

DD

V

SS

Pin

Data Reg.

Direction

Reg.

Rd

MUX

Selection

SCK Output

MUX

SCK Input

exck

MUX

Data Bus

V

DD

V

SS

Pin

Data Reg.

Direction

Reg.

Rd

MUX

Selection

SRDY Output

SRDY Input

SRDY

6. PORT STRUCTURES

R00~R07, R10~R17, R20~R27, R30~37

V

DD

Data Reg.

Dir.

Reg.

Data Bus

MUX

Rd

VSS

Pin

R40/INT0, R41/INT1, R42/INT2, R43/INT3, R44/

, R45/EC2, R50/SIN

EC0

Data Bus

Data Reg.

Direction

Reg.

PMR Selection

MUX

V

DD

Pin

V

SS

R52/SCLK

S53/SRDY

Rd

EX) INT0
Alternate Function

R46/T1O, R47/T3O, R51/SOUT, R54/WDTO
R55BUZ, R56/PWM0, R57/PWM1

Selection

Secondary function

MUX

Data Reg.

Data Bus

Direction

Reg.

MUX

Rd

V

DD

Pin

V

SS

10 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

RESET

V

DD

V

SS

TEST

V

DD

V

SS

OTP version: disconnected
Mask version: connected

R60/AN0 ~ R63/AN3

Data bus

To A/D converter

R64/AN7 ~ R67/AN7

Data Reg.

Dir.

Reg.

Data Bus

MUX

Rd

Rd

RESET

V

DD

V

SS

TEST

V

DD

Pin

V

SS

X

, X

IN

XIN

XOUT

To A/D converter

OUT

V

DD

V

V

SS

SS

Stop

DEC. 1999 Ver 1.04 11

GMS81508B/16B/24B HYUNDAI MicroElectronics

7. ELECTRICAL CHARACTERISTICS

7.1 Absolute Maximum Ratings

Supply voltage.............................................-0.3 to +7.0 V

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

Voltage on any pin with respect to Ground (V

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

Maximum current out of V
Maximum current into V
Maximum current sunk by (I
Maximum output current sourced by (I

pin..........................150 mA

SS

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

DD

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

OL

OH

)

SS

DD

per I/O Pin)

+0.3

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

7.2 Recommended Operating Conditions

Parameter Symbol Condition

f

=1 ~ 10 MHz

XIN

f

Supply Voltage

Operating Frequency

V

f

DD

XIN

=1 ~ 8 MHz

XIN

f

=1 ~ 4 MHz

XIN

VDD=4.5~5.5V
VDD=2.7~5.5V
VDD=2.2~5.5V

Maximum current (ΣI
Maximum current (ΣI

)......................................100 mA

OL

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

OH

Note: Stresses above those listed under “Absolute Maxi­mum Ratings” may cause per manent damage to the d e­vice. This is a stress ra ting only and functional ope r ati on of
the device at any oth er c ond iti ons ab ov e tho se ind ic ated in
the oper ati o na l se c ti ons of this s pecificatio n i s no t i mp l ie d .
Exposure to absolute maximum rating conditions for ex­tended periods may affect device reliability.

Specifications

Unit

Min. Max.

4.5

2.7

2.2
1

1
1

5.5

5.5

5.5
10

8
4

V

MHz

Operating Temperature

T

OPR

7.3 A/D Converter Characteristics

(TA=25°C, VSS=0V, VDD=5.12V@f

Parameter Symbol

Analog Input Voltage Range
Non-linearity Error
Differential Non-linearity Error
Zero Offset Error
Full Scale Error
Gain Error
Overall Accuracy
AV

Input Current I

DD

Conversion Time

=8MHz, VDD=3.072V@f

XIN

Normal Version
Temperature Extention Version

=4MHz)

XIN

Min.

V
N

N

N
N

N

N

T

CONV

AIN

NLE

DNLE

ZOE

FSE

GE

ACC

REF

V

SS

-

-

-

-

-

-

-0.51.01.0 mA

- - 40 20

-20

-40

85
85

Specifications

1

Typ.

f

XIN

-

1.0 ±1.5 ±1.5 LSB

±

1.0 ±1.5 ±1.5 LSB

±

0.5 ±1.5 ±1.5 LSB

±

0.35 ±0.5 ±0.5 LSB

±

1.0 ±1.5 ±1.5 LSB

±

1.0 ±1.5 ±1.5 LSB

±

Max.

=4MHz f

AV

DD

XIN

AV

=8MHz

DD

C

°

Unit

V

s

µ

12 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

Specifications

Parameter Symbol

Min.

Analog Power Supply Input Range

1. Data in “Typ” column is at 25°C unless otherwise stated. These parameters are for design guidance only and are not tested.

AV

DD

0.9V

DD

Typ.

V

DD

1

f

XIN

Max.

=4MHz f

1.1V

XIN

DD

Unit

=8MHz

V

7.4 DC Electrical Characteristics

(TA=-20~85°C, VDD=2.7~5.5V, Ta= -20~85°C, f

=8MHz, VSS=0V)

XIN

Parameter Symbol Condition

, RESET,

X

IN

R4, R5, R6
R0, R1, R2, R3

, RESET,

X

IN

R4, R5, R6
R0, R1, R2, R3 -

R0,R1,R2,R3,R4,R5
R6

R0,R1,R2,R3,R4,R5
R6

@ T

=25°C0.9V

A

All input pins -5.0 - 5.0

All input pins -5.0 - 5.0
RESET, EC0, EC2,

SIN, SCLK, INT0~INT3

SS

Input High Voltage

Input Low Voltage

Output High Voltage

Output Low Voltage

Power Fail Detect
Voltage

Input High
Leakage Current

Input Low
Leakage Current

Hysteresis

V

IH1

V

IH2

V

IL1

V

IL2

V

OH

V

OL

V

PFD

I

IH1

I

IL

, V

V

T+

T-

I

DD1fXIN

VDD=4.5
VDD=2.7

VDD=4.5
V

=2.7

DD

VDD=4.5
VDD=2.7
I

=-2mA

OH1

VDD=4.5
VDD=2.7
I

=5mA

OL1

V

=3.0V

PFD

V

=2.4V

PFD

VIN=V

DD

VIN=V

SS

= 8 MHz A ll inp ut = V

C ry s ta l Oscilla tor ,

Power Current

1. Data in “Typ.” column is at 4.5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested.

I

DD2fXIN

I

STOP

=4MHz

L1=CL2

=30pF

C
A ll inp ut = V

SS

,

Specifications

Min.

0.8V

0.7V

DD

DD

Typ.

-

-

1

-

-1.0

V

DD

-

PFD

--V

-1.0V

0.3 0.8 V

-820mA
410mA

-110µA

Max.

V

DD

V

DD

0.2V

0.3V

1.1V

+0.3

+0.3

DD

DD

PFD

Unit

V

V

V

A

µ

A

µ

DEC. 1999 Ver 1.04 13

GMS81508B/16B/24B HYUNDAI MicroElectronics

7.5 AC Characteristics

(TA=-20~+85°C, VDD=5V±10%, VSS=0V)

Parameter Symbol Pins

Operating Frequency
Oscillation Stabilizing

Time
External Clock Pulse

Width
External Clock Transi-

tion Time
Interrupt Pulse Width
RESET Input Width
Event Counter Input

Pulse Width
Event Counter Transi-

tion Time

f

XIN

t

ST

t

CPW

t

RCP,tFCP

t

IW

t

RST

t

ECW

t

REC,tFEC

Specifications

Min. Typ. Max.

X

XIN, X

X

X

IN

OUT

IN

IN

1.0 - 10.0 MHz

--20ms

40 - - ns

- - 20 ns

INT0, INT1, INT2, INT3 2 - -

RESET 8--

EC0, EC2 2--

EC0, EC2 - - 20 ns

Unit

t

SYS

t

SYS

t

SYS

XIN

INT0~INT3

RESET

EC1, EC2

t

0.8V

t

REC

SYS

DD

t

IW

= 1/f

t

ECW

XIN

t

FEC

t

RCP

t

t

RST

t

Figure 7-1 Timing Chart

CPW

t

ECW

t

CPW

-0.5V

V

DD

0.5V

t

FCP

IW

0.2V

DD

0.2V

DD

0.8V

DD

0.2V

DD

14 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

7.6 Serial Interface Timing Characteristics

(TA=-20~+85°C, VDD=5V±10%, VSS=0V, f

Parameter Symbol Pins

Serial Input Clock Pulse
Serial Input Clock Pulse Width
Serial Input Clock Pulse Transition

Time

SIN Input Pulse Transition Time

SIN Input Setup Time (External SCLK)
SIN Input Setup Time (Internal SCLK)
SIN Input Hold Time
Serial Output Clock Cycle Time
Serial Output Clock Pulse Width
Serial Output Clock Pulse Transition

Time
Serial Output Delay Time

XIN

t

SCYC

t

SCKW

t

FSCK

t

RSCK

t

FSIN

t

RSIN

t

SUS

t

SUS

t

HS

t

SCYC

t

SCKW

t

FSCK

t

RSCK

s

OUT

=8MHz)

Specifications

Unit

Min. Typ. Max.

SCLK
SCLK

2t

SYS

+70

t

SYS

-8ns

-8ns

+200

SCLK - - 30 ns

SIN - - 30 n s

SIN 100 - - ns
SIN 200 - ns

SIN
SCLK
SCLK

t

SYS

t

SYS

4t

SYS

-30

-ns

-

16t

SYS

ns
ns

+70

SCLK 30 ns

SOUT 100 ns

SCLK

SIN

SOUT

t

0.8V

0.2V

FSCK

t

SCYC

t

RSCK

SUS

DD
DD

t

SCKW

t

t

FSIN

t

DS

0.8V

DD

0.2V

DD

Figure 7-2 Serial I/O Timing Chart

t

SCKW

t

HS

0.8V

DD

0.2V

DD

t

RSIN

DEC. 1999 Ver 1.04 15

GMS81508B/16B/24B HYUNDAI MicroElectronics

7.7 Typical Characteristic Curves

This graphs and tables provided in this section are for de­sign guidance only and are not tested or guaranteed.

In some graphs or tables the data presented are out­side specified operating range (e.g. outside specified
VDD range). This is for information only and devices

are guaranteed to operate properly only within the
specified range.

I

OH

(mA)

-12

-9

-6

-3

I

OH

VDD=4.5V
Ta=25°C

0

V

−

OH

0.3 0.6

R0~R6 pins

0.9 1.2

1.5

VDD-V

(V)

OH

I

OH

(mA)

-12

-9

-6

-3

I

0

V

−

OH

VDD=3.0V
Ta=25°C

0.3 0.6

OH

The data presented in this s ection is a statistical s ummary
of data collected on units from different lots over a period
of time. “Typical” represents the mean of the distribution
while “max” or “min” represents (mean + 3σ) and (mean
3σ) respectively where σ is standard deviation

R0~R6 pins

(V)

0.9 1.2

1.5

VDD-V

OH

−

V

I

OL

(mA)

20

15

10

IH1

(V)

0

I

5

0

V

4

3

2

1

V

−

OL

VDD=4.5V
Ta=25°C

0.2 0.4

V

−

DD

f

=8MHz

XIN

Ta=25°C

23

OL1

IH1

R0~R6 pins

0.6 0.8

XIN, RESET,
R4, R5, R6 pins

45

1.0

I

V

−

OL

VDD=3.0V
Ta=25°C

0.2 0.4

V

DD

f

=8MHz

XIN

Ta=25°C

1

OL2

V

−

IH2

23

I

OL

(mA)

20

15

10

5

V

OL

(V)

V

DD

(V)

6

0

V

IH2

(V)

4

3

2

1

0

R0~R6 pins

0.6 0.8

R0, R1, R2, R3 pins

45

1.0

6

V

V
(V)

(V)

OL

DD

16 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

V

IL2

(V)

I

DD

(mA)

4

3

2

1

0

20

15

10

5

0

V

DD

f

XIN

Ta=25°C

I

−

DD

Ta=25°C

f

V

−

IL1

=8MHz

23

V

DD

= 8MHz

XIN

23

XIN, RESET
R4, R5, R6 pins

45

Normal Operation

4MHz

45

,

V

DD

(V)

6

V

DD

(V)

6

V

I

DD

(µA)

IL2

(V)

0.4

0.3

0.2

0.1

4

3

2

1

0

0

V

DD

f

XIN

Ta=25°C

1

I

STOP

V

−

IL2

=8MHz

23

V

−

DD

23

R0, R1, R2, R3 pins

45

Stop Mode

45

6

6

V

DD

(V)

85°C
25°C

-20°C

V

DD

(V)

Operating Area

f

XIN

(MHz)

Ta= -20~85°C

10

8
6

4
2
0

23

45

V

DD

(V)

6

DEC. 1999 Ver 1.04 17

GMS81508B/16B/24B HYUNDAI MicroElectronics

SP

01

H

Stack Address (100H ~ 1FEH)

Bit 15 Bit 087

Hardware fixed

00H~FE

H

8. MEMORY ORGANIZATION

The GMS81508B/16B/24B has separate address spaces
for Program memory and Data Memory. Pro gram memory
can only be read, not written to. It can be up to 24K bytes

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.

A
X
Y

SP

PCH

Figure 8-1 Configuration of Registers

Accumulator:

PCL

PSW

The Accumulator is the 8-bit general pur­pose register, used for data operation such as transfer, tem­porary saving, and conditional judgement, etc.

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

Y

A

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

Figure 8-2 Configuration of YA 16-bit Register

X, Y Registers

: In the addressing mode which uses these
index registers, the register conten ts a re added to the spec­ified address, which becomes the actual address. These
modes are extremely effective for referencing subroutine
tables and memory tables . The index regi sters also h ave in­crement, decrement, comparison and data transfer func­tions, and they can be used as simple accumulators.

Stack Pointer

: The Stack Pointer is an 8-bit register used
for occurrence interrupts and calling out subroutines. Stack
Pointer identifies the location in the stack to be accessed
(save or restore).

Generally, SP is au to mat ic ally upda t ed wh e n a s ubr outin e

ACCUMULATOR
X REGISTER
Y REGISTER

STACK POINTER
PROGRAM COUNTER

PROGRAM STATUS
WORD

Y A

of Program memory. Data memory can be read and written
to up to 448 bytes including the stack area.

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 100
1FF

of the internal data memory. The SP is not initialized

H

to

H

by hardware, requiring to write the initial v alue (the lo ca­tion with which the use of the stack starts) by using the ini­tialization routine. Normally, the initial value of “F E

” is

H

used.

Note: The Stack Pointer must be initialized by software be­cause its value is undefined after RESET.

Example: To initialize the SP

LDX #0FEH
TXSP ; SP ← FEH

Address 01FFH can not be used as stack. Don not use
1FFH, or malfunction would be occurred.

Program Counter

: The Program Counter is a 16-bit wide
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 program counter has reset rou­tine address (PC

Program Status Word

:0FFH, PCL:0FEH).

H

: 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 any carry or borrow from the ALU of CPU

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

18 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

[Zero flag Z]
This flag is set when the result of an arithmetic operat ion

MSB LSB

N

V G B H I Z C

NEGATIVE FLAG

OVERFLOW FLAG

when G=1, page is selected to “page 1”

SELECT DIRECT PAGE

BRK FLAG

PSW

Figure 8-3 PSW (Program Status Word) Register

[Interrupt disable flag I]
This flag enables/disables all interrupts except interrupt

caused by Reset or software BRK instruction. 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.

or data transfer is “0” and is cleared by any other result.

RESET VALUE: 00

CARRY FLAG RECEIVES
CARRY OUT

ZERO FLAG
INTERRUPT ENABLE FLAG

HALF CARRY FLAG RECEIVES
CARRY OUT FROM BIT 1 OF

ADDITION OPERLANDS

H

This flag assigns RAM page for direct addressing mode. In
the direct addressing mode, addressing area is from zero
page 00
addressing area is assigned 100

to 0FFH when this flag is "0". If it is set to "1",

H

to 1FFH. It is set by

H

SETG instruction and cleared by CLRG.
[Overflow flag V]

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

of ALU or there is no 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 instruction to distinguish

BRK from TCALL instruction with the same vector ad­dress.

[Direct page flag G]

This flag is set to “1” when an overflow occurs as the result
of an arithmetic operation involving signs. An overflow
occurs when the result of an addition or subtraction ex­ceeds +127(7F

) or -128(80H). The CLRV instruction

H

clears the overflow flag. There is no set instruction. When
the BIT instruction is executed, bit 6 of memory is copied
to this flag.

[Negative flag 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 executed, bit 7 of memory is copied to this flag.

DEC. 1999 Ver 1.04 19

GMS81508B/16B/24B HYUNDAI MicroElectronics

At execution of
a CALL/TCALL/PCALL

01FE
01FD
01FC
01FB

SP before
execution

SP after
execution

PCH
PCL

01FE

01FC

Push
down

SP before
execution

SP after
execution

01FE
01FD
01FC

01FB

At execution
of PUSH instruction
PUSH A (X,Y,PSW)

01FE
01FD
01FC

01FB

A

01FE

01FD

At acceptance
of interrupt

PCH
PCL
PSW

01FE

01FB

Push
down

Push
down

01FE
01FD
01FC

01FB

At execution
of RET instruction

01FE
01FD
01FC

01FB

At execution
of POP instruction
POP A (X,Y,PSW)

PCH
PCL

01FC

01FE

A

01FD

01FE

Pop
up

Pop
up

At execution
of RET instruction

01FE
01FD
01FC

01FB

0100H

01FEH

PCH

PCL

PSW

01FB

01FE

Stack
depth

Pop
up

Figure 8-4 Stack Operation

20 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

0FFE0H

E2

Address Vector Area Memory

E4
E6
E8
EA
EC
EE
F0

F2
F4
F6
F8
FA
FC
FE

-

-

Serial Communication Interface

Basic Interval Timer

-

-

-

External Interrupt 2

Timer/Counter 1 Interrupt

External Interrupt 0

-

RESET Vector Area

External Interrupt 1

Watchdog Timer Interrupt

“-” means reserved area.

NOTE:

Timer/Counter 2 Interrupt

External Interrupt 3

Timer/Counter 0 Interrupt

Timer/Counter 3 Interrupt

A/D Converter

8.2 Program Memory

A 16-bit program counter is capable of addressing up to
64K bytes, but this device has 2 4K bytes program memory
space only physically implemented. Accessing a location
above FFFF

will cause a wrap-around to 0000H.

H

Figure 8-5, shows a map of Pr ogram Memory. After reset,
the CPU begins execution from reset vector which is stored
in address FFFE

and FFFFH as shown in Figure 8-6.

H

As shown in Figure 8-5, each area is assigned a fix ed loca­tion in Program Memory. Program Memory area contains
the user program.

A000

H

C000

H

E000

H

FEFF

H

FF00

FFC0
FFDF

FFE0
FFFF

H

H
H

H
H

TCALL area

Interrupt

Vector Area

PCALL area

GMS81508B, 8K ROM

GMS815024B, 24K ROM

GMS815016B, 16K ROM

it is more useful to save program byte length.
Table Call (TC ALL) causes the CP U to jump to each

TCALL address, where it commences the execution of the
service routine. The Table Call service area spaces 2-byte
for every TCALL: 0FFC0

for TCALL15, 0FFC2H for

H

TCALL14, etc., as shown in Figure 8-7.
Example: Usage of TCALL
The interrupt causes the CPU to jum p to specific location,

where it commences the execution of the service routine.
The External interrupt 0, for example, is assigned to loca­tion 0FFFA
interval: 0FFF8
0FFFA

Any area from 0FF00

. The interrupt service locations spaces 2-byte

H

and 0FFF9H for External Interru pt 1,

and 0FFFBH for External Interrupt 0, etc.

H

H

to 0FFFFH, if it is not going to be

H

used, its service location is available as general purpose
Program Memory.

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 instruction. If it is frequently called,

DEC. 1999 Ver 1.04 21

Figure 8-6 Interrupt Vector Area

GMS81508B/16B/24B HYUNDAI MicroElectronics

11111111 11010110

01001010

PC:

FH FH DH 6H

4A

~

~

~

~

25

0FFD6

H

0FF00

H

0FFFF

H

D1

NEXT

0FFD7

H

➊

➋

➌

0D125

H

Reverse

Address

0FF00

0FFFF

PCALL Area Memory

H

PCALL Area

(256 Bytes)

H

Address P ro gra m Mem o r y

0FFC0

H

C1
C2

C3
C4
C5
C6
C7
C8
C9
CA
CB
CC
CD
CE
CF

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

NOTE:

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

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 *

PCALL

→

→

→ →

rel

4F35 PCALL 35H

0FF00

0FF35

0FFFF

Figure 8-7 PCALL and TCALL Memory Area

TCALL

→

→

→ →

n

4A TCALL 4

4F

35

~

~

H

H

NEXT

H

~

~

22 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

Example: The usage software example of Vector address for GMS81524B.

ORG 0FFE0H
DW NOT_USED

DW NOT_USED
DW SIO ; Serial Interface
DW BIT_TIMER ; Basic Interval Timer
DW WD_TIMER ; Watchdog Timer
DW ADC ; ADC
DW TIMER3 ; Timer-3
DW TIMER2 ; Timer-2
DW TIMER1 ; Timer-1
DW TIMER0 ; Timer-0
DW INT3 ; Int.3
DW INT2 ; Int.2
DW INT1 ; Int.1
DW INT0 ; Int.0
DW NOT_USED ; ­DW RESET ; Reset

; ORG 0C000H ; 16K ROM Start address
; ORG 0E000H ; 8K ROM Start address

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

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

;

;

ORG 0A000H ; 24K ROM Start address

CLRG
LDX #0

STA {X}+
CMPX #0C0H
BNE RAM_CLR

LDX #0FEH ;Stack Pointer Initialize
TXSP

LDM R0, #0 ;Normal Port 0
LDM R0DD,#82H ;Normal Port Direction
:
:
:
LDM TDR0,#250 ;8us x 250 = 2000us
LDM TM0,#1FH ;Start Timer0, 8us at 8MHz
LDM IRQH,#0
LDM IRQL,#0
LDM IENH,#0C8H ;Enable Timer0, INT0, INT1
LDM IENL,#0
LDM IEDS,#55H ;Select falling edge detect on INT pin
LDM PMR4,#3H ;Set external interrupt pin(INT0, INT1)
EI ;Enable master interrupt
:
:
:

:

NOT_USED:NOP

:
RETI

DEC. 1999 Ver 1.04 23

GMS81508B/16B/24B HYUNDAI MicroElectronics

8.3 Data Memory

Figure 8-8 shows the internal Data Memory space availa­ble. Data Memory is divided in to four groups, a user RAM,
control registers, Stack, and LCD memory.

0000

H

Note that unoccupied addresses may not be implemented
on the chip. Read accesses to these addresses will in gen­eral return random data, and write accesses will have an in­determinate effect.

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

User Memory

00BF
00C0

00FF

0100

01FF

H
H

H
H

H

Control

Registers

User Memory
or Stack Area

PAGE0

PAGE1

When “G-flag=0”,

this page is selected

When “G-flag=1”

Figure 8-8 Data Memory Map

User Memory

The GMS815xxB has 448 × 8 bits for th e user me mory
(RAM).

Control Registers

The control registers are used by the CPU and Peripheral
function blocks for controlling the desired operation of the
device. Therefore these registers contain control and status
bits for the interrupt system, the timer/ counters, analog to
digital converters and I/O ports. The control registers are in
address range of 0C0

to 0FFH.

H

Note: Write only registers can not be accessed by bit ma­nipulation instruction. Do not use read-modify-write instruc­tion. Use byte manipulation instruction, for example “LDM”.

Example; To write at CKCTLR

LDM CLCTLR,#09H

;Divide ratio(÷32)

Stack Area

The stack provides the area where the return address is
saved before a jump is performed during the processing
routine at the execution of a subroutine call instruction or
the acceptance of an interrupt.

When returning from the processing routine, execu ting the
subroutine return instruction [RET] restores the contents of
the program counter from the stack; ex ecuting the interrupt
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 20.

24 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

Address Register Name Symbol R/W

Initial Value

76543210

Page

00C0 R0 port data register R0 R/W Undefined page 31
00C1 R0 port I/O direction reg ister R0DD W 0 0 0 0 0 0 0 0 page 31
00C2 R1 port data register R1 R/W Undefined page 31
00C3 R1 port I/O direction reg ister R1DD W 0 0 0 0 0 0 0 0 page 31
00C4 R2 port data register R2 R/W Undefined page 31
00C5 R2 port I/O direction reg ister R2DD W 0 0 0 0 0 0 0 0 page 31
00C6 R3 port data register R3 R/W Undefined page 32
00C7 R3 port I/O direction reg ister R3DD W 0 0 0 0 0 0 0 0 page 32
00C8 R4 port data register R4 R/W Undefined page 32
00C9 R4 port I/O direction reg ister R4DD W 0 0 0 0 0 0 0 0 page 32
00CA R5 port data register R5 R/W Undefined page 33

00CB R5 port I/O direction register R5DD W 0 0 0 0 0 0 0 0 page 33
00CC R 6 port data register R6 R/W Undefined page 33
00CD R6 port I/O direction register R6DD W 0 0 0 0 - - - - page 33

00D0 R4 port mode register PMR4 W 0 0 0 0 0 0 0 0

00D1 R5 port mode register PMR5 W - - 0 0 - - - -

page 32, page 63
page 33, page 55

Basic interval timer mode register BITR R Undefined page 35

00D3

Clock contr ol register CKCTLR W - - 0 1 0 1 1 1 page 35
00E0 Watchdog Timer Register WDTR W - 0 1 1 1 1 1 1 page 64
00E2 Timer mode register 0 TM0 R/W 0 0 0 0 0 0 0 0 page 37
00E3 Timer mode register 2 TM2 R/W 0 0 0 0 0 0 0 0 page 37

Timer 0 data register TDR0 W Undefined page 37
00E4

00E5

Timer 0 counter register T0 R Undefined page 37

Timer 1 data register TDR1 W Undefined page 37

Timer 1 counter register T1 R Undefined page 37

Timer 2 data register TDR2 W Undefined page 37
00E6

Timer 2 counter register T2 R Undefined page 37

Timer 3 data register TDR3 W Undefined page 37
00E7

Timer 3 counter register T3 R Undefined page 37
00E8 A/D converter mode register ADCM R/W - - 0 0 0 0 0 1 page 47
00E9 A/D converter data register ADR R Undefined page 47

00EA Serial I/O mode register SIOM R/W - 0 0 0 0 0 0 1 page 49
00EB Serial I/O register SIOR R/W Undefined page 49
00EC Buzzer driver regi ste r BUR W Undefined page 55

00F0 PWM0 duty register PWMR0 W Undefined page 53

Table 8-1 Control Registers

DEC. 1999 Ver 1.04 25

GMS81508B/16B/24B HYUNDAI MicroElectronics

Address Register Name Symbol R/W

Initial Value

76543210

Page

00F1 PWM1 duty register PWMR1 W Undefined page 53
00F2 PWM control register PWMCR W 0 0 0 0 0 0 0 0 page 53
00F4 Interrupt enable register low IENL R/W 0 0 0 0 - - - - page 58
00F5 Interrupt request flag register low IRQL R/W 0 0 0 0 - - - - page 57
00F6 Interrupt enable register high IENH R/W 0 0 0 0 0 0 0 0 page 58
00F7 Interrupt request flag register high IRQH R/W 0 0 0 0 0 0 0 0 page57
00F8 External interrupt edge selection register IEDS W 0 0 0 0 0 0 0 0 page 63
00F9 Power fail detection register PFDR R/W - - - - 1 1 0 0 page 71

Table 8-1 Control Registers

W

R/W

- : this bit location is reserved.

Registers are controlled by byte manipulation instruction such as LDM etc., do not use bit manipulation
instruction such as SET1, CLR1 etc. If bit manipulation instruction is used on these registers,
content of other seven bits are may varied to unwanted value.

Registers are controlled by both bit and byte manipulation instruction.

26 DEC. 1999 Ver 1.04

HYUNDAI MicroElectronics GMS81508B/16B/24B

8.4 Addressing Mode

The GMS800 series MCU uses six addressing modes;

• Register addressing

• Immediate addressing

• Direct page addressing

• Absolute addressing

• Indexed addressing

• Register-indirect addressing

(1) Register Addressing

Register addressing accesses the A, X, Y, C and PSW.

(2) Immediate Addressing

→

→

→ →

#imm

In this mode, second byte (operand) is accessed as a data
immediate ly.

Example:

0435 ADC #35H

MEMORY

Example: G=1

E45535 LDM 35H,#55H

0135H

➊

0F100H
0F101H
0F102H

(3) Direct Page Addressing

data

~

~

~

~

data ¨ 55H

➋

E4

55

35

dp

→

→

→ →

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

C535 LDA 35H ;A ←RAM[35H]

04
35

A+35H+C → A

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

35H

0E550H
0E551H

data

➋

~

~

C5

35

~

~

data → A

➊

DEC. 1999 Ver 1.04 27