Z90251 datasheet(11/97 Pages) ZILOG

Part #	Z90251

Description	Z90255 ROM and Z90251 OTP 32 KB Television Controller with OSD

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Manufacturer	ZILOG [Zilog, Inc.]

Direct Link	http://www.zilog.com

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Z90255 ROM and Z90251 OTP

32 KB Television Controller with OSD

PS001301-0800

3

Figure 2

Z90255 Block Diagram

PWM 6 can be either a 6-bit or 14-bit output.

The Z90255 takes full advantage of ZilogÕs Z8 expanded register file space to

offer greater flexibility in creating a user-friendly On-Screen Display (OSD).

Three basic addressing spaces are available: Program memory, Video RAM

(VRAM) and the Register file. The register file is composed of 300 bytes of

general-purpose registers, 16 control and status registers, one I/O port register

and three reserved registers.

RESET

Oscillator

WDT

Counter

Timer

Counter

Timer

4-Bit

ADC

IR

Counter

Port 6

300 Byte

Register File

Port 2

18 KB by 7-Bit

Character

PWM 11 & 6

PWM 1

to

PWM 10

(14-bit)

(6-bit)

XTAL1

XTAL2

RESET

ADC0

ADC1

ADC2

ADC3

IRIN

P60

P61

P62

P63

P21

P22

P23

P24

P25

P26

P27

P20

PWM11

PWM1

PWM2

PWM3

PWM4

PWM5

PWM6

PWM8

PWM9

PWM10

SCLK0

SDATA0

I

2

C

P50

P51

P52

P53

P54

P55

P56

Port 5

Interface

SCLK1

SDATA1

ROM or OTP

PWM7

240 x 12-Bit

Character RAM

& 10 x 8-Bit

32 KB

Program ROM

Microprocessor

Core

or

32 KB

Program OTP

Internal

On-Screen

Display

OSDX1

OSDX2

HSYNC

VSYNC

R

G

B

VBLANK

HLFTN

Port 4

P40

P41

P42

P43

P44

P45

P46

P47

PWM6

Note:

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Z90251 Datasheet(PDF) 11 Page - Zilog, Inc.

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