MYSON MTV112AN, MTV112AV Datasheet

MYSON

-bytes internal RAM.

16K-bytes program Mask ROM.

24Cxx series EEPROM interface, A/D converter and a 16K-bytes internal program Mask ROM.

MTV112A

TECHNOLOGY

(Rev 1.9)

8051 Embedded CRT Monitor Controller

MASK Version

FEATURES

l 8051 core.
l 384

l

l 14-channels 10V open-drain PWM DAC, 10 dedicated channels and 4 channels shared with I/O pin.
l 28 bi-direction I/O pin,12 dedicated pin,12 shared with DAC,4 shared with DDC/IIC interface.
l 5-output pin shared with H/V sync output and self test output pins.
l SYNC processor for composite separation, polarity and frequency check, and polarity adjustment.
l Built-in monitor self-test pattern generator.
l Built-in low power reset circuit.
l One slave mode IIC interface and one master mode IIC interface.
l IIC interface for DDC1/DDC2B and EEPROM; only one EEPROM needed to store DDC1/DDC2B and

display mode information.

l Dual 4-bit ADC or 4 channel 6-bit ADC.
l Watchdog timer with programmable interval.
l 40-pin PDIP and 44-pin PLCC package.

GENERAL DESCRIPTION

The MTV112A micro-controller is an 8051 CPU core embedded device specially tailored to CRT monitor
applications. It includes an 8051 CPU core, 384-byte SRAM, 14 built-in PWM DACs, DDC1/DDC2B interface,

BL OCK DIAGRAM

STOUT

P1.0-7

X1

X2

P2.0-3

P3.0-P3.2

8051

CORE

P3.4

P0.0-7

RD

WR

INT
1

RST

P2.4-7

P0.0-7

XFR

RD

WR

WATCH-DOG

TIMER

RST

H / VSYNC
CONTROL

14 CHANNEL

PWM DAC

HSYNC

VSYNC
HBLANK
VBLANK

DA0-9

DA10-13

ADC

AD0
AD1

HSCL
HSDA

This datasheet contains new product information. Myson Technology reserves the rights to modify the product specification without
notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.

DDC 1/2 B & FIFO

INTERFACE

IIC INTERFACE

1/20

ISCL

ISDA

MTV112A Revision 1.9 05/18/2001

MYSON

MTV112A

TECHNOLOGY

1.0 PIN CONNECTION

P1.0
P1.1/HALFV
P1.2/HALFH

P1.3/HCLAMP

P1.4/AD2
P1.5/AD3
P1.6/AD0
P1.7/AD1

RST

HSCL/P3.0/Rxd
HSDA/P3.1/Txd

ISDA/P3.2/INT0

HSYNC

ISCL/P3.4/T0

VSYNC
HBLANK/P4.1
VBLANK/P4.0

X2
X1

VSS

MTV112A

VDD
DA0/P5.0
DA1/P5.1
DA2/P5.2
DA3/P5.3
DA4/P5.4
DA5/P5.5
DA6/P5.6
DA7/P5.7
DA8
DA9
STOUT/P4.2
DA10/P2.7
DA11/P2.6
DA12/P2.5
DA13/P2.4
P2.3
P2.2
P2.1
P2.0/INT0

P1.0
P1.1/HALFV
P1.2/HALFH

P1.3/HCLAMP

P1.4/AD2
P1.5/AD3
P1.6/AD0
P1.7/AD1

RST

HSCL/P3.0/Rxd
HSDA/P3.1/Txd

ISDA/P3.2/INT0

HSYNC

ISCL/P3.4/T0

VSYNC

HCLAMP/P4.4

HBLANK/P4.1
VBLANK/P4.0

X2
X1

VSS

(Rev 1.9)

MTV112A

VDD
DA0/P5.0
DA1/P5.1
DA2/P5.2
DA3/P5.3
DA4/P5.4
DA5/P5.5
DA6/P5.6
DA7/P5.7
DA8
DA9
HALFH/P4.3
STOUT/P4.2
DA10/P2.7
DA11/P2.6
DA12/P2.5
DA13/P2.4
P2.3
P2.2
P2.1
P2.0/INT0

NC
P1.5/AD3
P1.6/AD0
P1.7/AD1

RESET

HSCL/P3.0/Rxd
HSDA/P3.1/Txd
ISDA/P3.2/INT0

HSYNC

ISCL/P3.4/T0

VSYNC

P1.4/AD2

P1.3/HCLAMP

P1.2/HALFH

P1.1/HALFV

P1.0

VDD

DA0/P5.0

DA1/P5.1

6

5

4

3

2

1

4443424140

7
8
9
10
11
12
13
14
15
16
17

1819202122232425262728

NC

MTV112A

X2

VBLANK/P4.0

HBLANK/P4.1

X1

VSS

P2.1

P2.0/INT0

2/20

DA2/P5.2

DA3/P5.3

P2.2

P2.3

NC

DA4/P5.4

39

DA5/P5.5

38

DA6/P5.6

37

DA7/P5.7

36

DA8

35

DA9

34

STOUT/P4.2

33

DA10/P2.7

32

DA11/P2.6

31

DA12/P2.5

30

NC

29

DA13/P2.4

MTV112A Revision 1.9 05/18/2001

MYSON

Hsync half frequency output.

ISDA/P3.2/INT0

MTV112A

TECHNOLOGY

2.0 PIN DESCRIPTIONS

Name Type

P1.0
P1.1/HALFV
P1.2/HALFH
P1.3/HCLAM P
P1.4/AD2
P1.5/AD3
P1.6/AD0
P1.7/AD1
RST
HSCL/P3.0/Rxd
HSDA/P3.1/Txd

HSYNC
ISCL/P3.4/T0
VSYNC
HCLAMP/P4.4
HBLA NK /P4.1
VBL ANK /P4.0
X2
X1
VSS
P2.0/INT0
P2.1
P2.2
P2.3
DA13/P2.4
DA12/P2.5
DA11/P2.6
DA10/P2.7
STOUT/P4.2
HALFH/P4.3
DA9
DA8
DA7/P5.7
DA6/P5.6
DA5/P5.5
DA4/P5.4
DA3/P5.3
DA2/P5.2
DA1/P5.1
DA0/P5.0
VDD

(Rev 1.9)

Pin#

40 42 44

I/O 1 1 2 General purpose I/O
I/O 2 2 3 General purpose I/O / Vsync half frequency output.
I/O 3 3 4 General purpose I/O /
I/O 4 4 5 General purpose I/O / Hsync clamp pulse output.
I/O 5 5 6 General purpose I/O / ADC input.
I/O 6 6 8 General purpose I/O / ADC input.
I/O 7 7 9 General purpose I/O / ADC input
I/O 8 8 10 General purpose I/O / ADC input

I 9 9 11 Active high reset

I/O 10 10 12 IIC clock / General purpose I/O / Rxd
I/O 11 11 13 IIC data / General purpose I/O / Txd
I/O 12 12 14 IIC data / General purpose I/O / INT0

I 13 13 15 Horizontal SYNC or Composite SYNC

I/O 14 14 16 IIC clock / General purpose I/O / T0

I 15 15 17 Vertical SYNC

O - 16 - Hsync clamp pulse output / General purpose output
O 16 17 19 Horizontal blank / General purpose output
O 17 18 20 Vertical blank / General purpose output
O 18 19 21 Oscillator output

I 19 20 22 Oscillator input

- 20 21 23 Ground

I/O 21 22 24 General purpose I/O / INT0
I/O 22 23 25 General purpose I/O
I/O 23 24 26 General purpose I/O
I/O 24 25 27 General purpose I/O
I/O 25 26 28 PWM DAC output / General purpose I/O (open-drain)
I/O 26 27 30 PWM DAC output / General purpose I/O (open-drain)
I/O 27 28 31 PWM DAC output / General purpose I/O (open-drain)
I/O 28 29 32 PWM DAC output / General purpose I/O (open-drain)

O 29 30 33 Self-test video output / General purpose output
O - 31 - Hsync half frequency output / General purpose output
O 30 32 34 PWM DAC output / General purpose I/O (open-drain)
O 31 33 35 PWM DAC output / General purpose I/O (open-drain)
O 32 34 36 PWM DAC output / General purpose I/O (open-drain)
O 33 35 37 PWM DAC output / General purpose I/O (open-drain)
O 34 36 38 PWM DAC output / General purpose I/O (open-drain)
O 35 37 39 PWM DAC output / General purpose I/O (open-drain)
O 36 38 41 PWM DAC output / General purpose I/O (open-drain)
O 37 39 42 PWM DAC output / General purpose I/O (open-drain)
O 38 40 43 PWM DAC output / General purpose I/O (open-drain)
O 39 41 44 PWM DAC output / General purpose I/O (open-drain)

- 40 42 1 Positive power supply

Description

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MTV112A Revision 1.9 05/18/2001

MYSON

PADMOD

PADMOD

PADMOD

MTV112A

TECHNOLOGY

(Rev 1.9)

3.0 FUNCTIONAL DESCRIPTION

1. 8051 CPU Core

MTV112A includes all 8051 functions with the following exceptions:

1.1 PSEN, ALE, RD and WR pins are disabled. The external RAM access is restricted to XFRs within
MTV112A.

1.2 Port 0, port 3.3, and ports 3.5 ~ 3.7 are not general-purpose I/O ports. They are dedicated to monitor
control or DAC pins.

1.3 INT1 and T1 input pins are not provided.

1.4 Ports 2.4 ~ 2.7 are shared with DAC pins; ports 3.0 ~ 3.2, and port3.4 are shared with monitor control
pins.

In addition, there are 2 timers, 5 interrupt sources and a serial interface compatible with the standard 8051.
The Txd/Rxd (P3.0/P3.1) pins are shared with DDC interface. INT0/T0 pins are shared with IIC interface. An
extra option can be used to switch the INT0 source from P3.2 to P2.0. This feature maintains an external
interrupt source when IIC interface is enabled.

Note: All regis t ers li st ed in th i s do c um ent resid e in the external RAM area (XFR). For the intern al

RAM memory map pl ease refer to th e 8051 spec.

Reg name

addr bit7 b it6 bit5 b it4 bit3 b it2 bit1 b it0

30h (w) SINT0 IICF DDCE IICE DA13E DA12E DA11E DA10E
31h (w) P57E P56E P55E P54E P53E P52E P51E P50E
37h (w) - - - - - - - MORE

SINT0 = 1 → INT0 source is pin #21.

= 0 → INT0 source is pin #12.

IICF = 1 → Selects 400kHz master IIC speed.

= 0 → Selects 100kHz m aster IIC speed.

DDCE = 1 → P in #10 is HSCL; pin #11 is HSDA.

= 0 → Pin #10 is P3.0/Rxd; pin #11 is P3.1/Txd.

IICE = 1 → Pin #12 is ISDA; pin #14 is ISCL.

= 0 → Pin #12 is P3.2/(INT0*); pin #14 is P3.4/T0.

DA13E = 1 → Pin #25 is DA13.

= 0 → Pin #25 is P2.4.

DA12E = 1 → Pin #26 is DA12.

= 0 → Pin #26 is P2.5.

DA11E = 1 → Pin #27 is DA11.

= 0 → Pin #27 is P2.6.

DA10E = 1 → Pin #28 is DA10.

= 0 → Pin #28 is P2.7.

P57E = 1 → Pin #32 is P5.7.
= 0 → Pin #32 is DA7.
P56E = 1 → Pin #33 is P5.6.
= 0 → Pin #33 is DA6.
P55E = 1 → Pin #34 is P5.5.
= 0 → Pin #34 is DA5.
P54E = 1 → Pin #35 is P5.4.
= 0 → Pin #35 is DA4.
P53E = 1 → Pin #36 is P5.3.
= 0 → Pin #36 is DA3.
P52E = 1 → Pin #37 is P5.2.
= 0 → Pin #37 is DA2.

MTV112A Revision 1.9 05/18/2001

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MYSON

controlled by (MCLK1,MCLK0) bits.

Memory Allocation

256 bytes, accessible by

pulse width is controlled by an 8-bit register in XFR. The frequency of PWM

tal, selected by DACK. And the frequency of these DAC outputs is (PWM

clk frequency)/256, selected by DIV253. If DIV253=1, writing FDH/FEH/FFH to the DAC register

MTV112A

TECHNOLOGY

P51E = 1 → Pin #38 is P5.1.
= 0 → Pin #38 is DA1.
P50E = 1 → Pin #39 is P5.0.
= 0 → Pin #39 is DA0.
MORE = 1 → Bits P57E,P56E,P55E,P54E,P53E,P52E,P51E,P50E,DACK,EHALFV,
EHALFH,ENCLP,ADCMOD can be programmed,and master IIC speed is

= 0 → above bits internal keep “0” by MTV112A, and master IIC speed is controlled by
IICF bit.
* SINT0 should be 0 in this case.

2.

2.1 Internal Special Function Registers (SFR)
SFR is a group of registers that is the same as standard 8051.

2.2 Internal RAM
There is a 384 bytes RAM in MTV112A. The first portion of the RAM area contains
setting PSW.1=0; the second portion of the RAM area contains 128 bytes, accessible by setting PSW.1=1.

2.3 External Special Function Registers (XFR)
XFR is a group of registers allocated in the 8051 external RAM area. Most of the registers are used for
monitor control or PWM DAC. The program can initialize Ri value and use "MOVX" instruction to access
these registers.

(Rev 1.9)

FFH

80H
7FH

00H

3. PWM DAC

Each D/A converter's output
is X’tal or 2 * X’
or (PWM
generates stable high output. If DIV253=0, the output will pulse low at least once even if the DAC register's
content is FFH. Writing 00H to the DAC register generates stable low output.

Accessible by indirect

addressing only.

The value of PSW.1 =

both 0 and 1.

(Using MOV A, @Ri

instruction)

Accessible by direct

and indirect

addressing.

PSW.1=0

reg name

DA0
DA1
DA2
DA3

addr bit7 b it6 bit5 b it4 bit3 b it2 bit1 b it0

20h (r/w) DA0
21h (r/w)
22h (r/w) DA2
23h (r/w) DA3

DA1

b7
b7
b7
b7

Accessible by direct

Accessible by direct

DA0
DA1
DA2
DA3

SFR

addressing.

and indirect
addressing.

PSW.1 =1

DA0

b6

DA1

b6

DA2

b6

DA3

b6

b5
b5
b5
b5

DA0
DA1
DA2
DA3

b4
b4
b4
b4

FFH

00H

DA0
DA1
DA2
DA3

Accessible by indirect

external RAM

addressing.

(Using MOVX A, @Ri

Instruction.)

DA0

b3
b3
b3
b3

DA1
DA2
DA3

b2
b2
b2
b2

MTV112A Revision 1.9 05/18/2001

XFR

DA0
DA1
DA2
DA3

clk frequency)/253

DA0

b1

DA1

b1

DA2

b1

DA3

b1

clk

b0
b0
b0
b0

5/20

MYSON

WCLR

WDT2

WDT1

WDT0

Watchdog timer & special

The PWM DAC outputs frequency is (PWM
The PWM DAC output frequency is

tal frequency).

output while VSYNC speeds up to a high DDC communication clock rate. T he present and frequency

4.2 H/V Frequency Counter

MTV112A

TECHNOLOGY

DA4
DA5
DA6
DA7
DA8

DA9
DA10
DA11
DA12
DA13

WDT

DACK = 1 → The PWM clk frequency is 2 x (X’

24h (r/w) DA4
25h (r/w)
26h (r/w) DA6
27h (r/w) DA7
28h (r/w) DA8
29h (r/w)

2Ah (r/w)
2Bh (r/w)
2Ch (r/w)
2Dh (r/w)

80h WEN

DA0 (r/w) : The output pulse width control for DA0.
DA1 (r/w) : The output pulse width control for DA1.
DA2 (r/w) : The output pulse width control for DA2.
DA3 (r/w) : The output pulse width control for DA3.
DA4 (r/w) : The output pulse width control for DA4.
DA5 (r/w) : The output pulse width control for DA5.
DA6 (r/w) : The output pulse width control for DA6.
DA7 (r/w) : The output pulse width control for DA7.
DA8 (r/w) : The output pulse width control for DA8.
DA9 (r/w) : The output pulse width control for DA9.
DA10 (r/w) : The output pulse width control for DA10.
DA11 (r/w) : The output pulse width control for DA11.
DA12 (r/w) : The output pulse width control for DA12.
DA13 (r/w) : The output pulse width control for DA13.
WDT (w) :

DIV253 = 1 →

= 0 →
= 0 → The PWM clk frequency is (X’tal frequency).

DA5

DA9
DA10b7DA10b6DA10b5DA10b4DA10b3DA10b2DA10b1DA10
DA11b7DA11b6DA11b5DA11b4DA11b3DA11b2DA11b1DA11
DA12b7DA12b6DA12b5DA12b4DA12b3DA12b2DA12b1DA12
DA13b7DA13b6DA13b5DA13b4DA13b3DA13b2DA13b1DA13

DA4

b7

DA5

b7

DA6

b7

DA7

b7

DA8

b7

DA9

b7

b6
b6
b6
b6
b6
b6

DA4

b5

DA5

b5

DA6

b5

DA7

b5

DA8

b5

DA9

b5

CLRDDC

DA4

b4

DA5

b4

DA6

b4

DA7

b4

DA8

b4

DA9

b4

DIV253 DACK

control bit.

DA4
DA5
DA6
DA7
DA8
DA9

DA4

b3
b3
b3
b3
b3
b3

b2

DA5

b2

DA6

b2

DA7

b2

DA8

b2

DA9

b2

clk frequency)/253.

Xtal frequency/256.

DA4
DA5
DA6
DA7
DA8
DA9

(Rev 1.9)

DA4

b1
b1
b1
b1
b1
b1

DA5
DA6
DA7
DA8
DA9

b0
b0
b0
b0
b0
b0

b0
b0
b0
b0

*1. All D/A converters are centered with value 80h after power-on.

4. H/V SYNC Processing

The H/V SYNC processing block performs the functions of composite signal separation , SYNC input
presence check, frequency counting, and polarity detection and control, as well as the protection of VBLANK

function block treat any pulse less than one OSC period as noise.

4.1 Composite SYNC Separation
MTV112A continuously monitors the input HSYNC. If the vertical SYNC pulse can b e extrac ted from the
input, a CVpre flag is set and the user can select the extracted "CVSYNC" for the source of polarity check,
frequency count and VBLANK. The CVSYNC will have a 10-16 us delay compared to the original signal. The
delay depends on the OSC frequency and composite mix method.

MTV112A can discriminate HSYNC/VSYNC frequency and saves the information in XFRs. The 15-bit
Hcounter counts the time of the 64xHSYNC period, but only 11 upper bits are loaded into the
HCNTH/HCNTL latch. The 11-bit output value is {2/H-Freq} / {1/OSC-Freq}, updated once per
VSYNC/CVSYNC period when VSYNC/CVSYNC is present or continuously updated when VSYNC/CVSYNC
is not present. The 14-bit Vcounter counts the time between 2 VSYNC pulses, but only 9 upper bits are

MTV112A Revision 1.9 05/18/2001

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