Z90255 ROM and Z90251 OTP
32 KB Television Controller
with OSD
Product Specification
PS001301-0800
ZiLOG W
ORLDWIDE
H
EADQUARTERS
¥ 910 E. H
A
milton Avenue ¥ Campbell, CA 95008
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Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
iii
Table of Contents
1
Overview 1
1.1
1.2
1.3
Pin Assignment and Descriptions .................................................... 5
Single-Purpose Pin Descriptions ..................................................... 7
Multiplexed Pin Descriptions............................................................ 8
2
Memory Description ........................................................................ 10
2.1
2.2
2.3
Standard Register File ................................................................... 10
Expanded Register File ................................................................. 11
Program Memory ........................................................................... 11
3
4
Watch-Dog Timer (WDT) ................................................................ 15
Stop Mode and Halt Mode Operation .............................................. 16
4.1
4.2
4.3
Power-Down Halt-Mode Operation ................................................ 16
Stop Mode Operation ..................................................................... 17
STOP Mode Recovery Register .................................................... 18
5
On-Screen Display .......................................................................... 22
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
OSD Position ................................................................................. 22
Second Color Feature.................................................................... 25
Mesh and Halftone Effect .............................................................. 28
OSD Fade ...................................................................................... 33
Inter-Row Spacing ......................................................................... 36
Character Generation .................................................................... 37
Character Size and Smoothing Effect ............................................ 39
Fringing Effect................................................................................ 40
Display Attribute Control ................................................................ 40
HV Interrupt Processing ................................................................. 49
6
7
Z90255 I2C Master Interface .......................................................... 53
Input/Output Ports ........................................................................... 57
7.1
7.2
7.3
Port 4 Pin-Out Selection Register.................................................. 59
Port 5 Pin-Out Selection Register .................................................. 62
Port 6 Data Register ...................................................................... 63
8
Infrared Interface ............................................................................. 65
PS001301-0800
Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
iv
9
Pulse Width Modulators .................................................................. 68
9.1
9.2
9.3
PWM Mode Register ...................................................................... 68
PWM1 through PWM11 ................................................................. 70
Digital/Analog Conversion with PWM ............................................ 79
10
11
Analog-to-Digital Converter ............................................................. 80
Electrical Characteristics ................................................................. 83
11.1
11.2
11.3
11.4
Absolute Maximum Ratings ............................................................ 83
DC Characteristics ......................................................................... 84
AC Characteristics ......................................................................... 85
Timing Diagram ............................................................................. 86
12
Packaging ....................................................................................... 87
Ordering Information ....................................................................... 88
ROM Code Submission ................................................................... 88
Customer Feedback Form .............................................................. 89
PS001301-0800
Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
v
List of Figures
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Z90255-Based TV System Application ........................................................ 2
Z90255 Block Diagram ................................................................................ 3
Z90255 and Z90251 Pin Assignments......................................................... 5
Code Development Environment ............................................................... 10
Register File Map....................................................................................... 12
Program Memory Map ............................................................................... 14
Stop Mode Recovery Source/Level Select ................................................ 21
Positive and Negative Sync Signals .......................................................... 23
Second Color Display ................................................................................ 28
Mesh On .................................................................................................... 29
Video Fade (Example) ............................................................................... 34
Character Pixel map in CGROM................................................................ 37
Example of a Multiple Character Icon........................................................ 38
Smoothing Effect on 2X Character Size .................................................... 39
VRAM Data Path for 512 Character Set .................................................... 42
H
SYNC
and V
SYNC
Specification ............................................................... 52
Bidirectional Port Pin Pad Multiplexed with I2C Port ................................. 53
Pulse Width Modulator Timing Diagram, 6 Bit ........................................... 71
Pulse Width Modulator Timing Diagram, 14-Bit ......................................... 72
Analog Signals Generated from PWM Signals .......................................... 79
ADC Block Diagram ................................................................................... 82
Timing Requirements of External Inputs.................................................... 86
42-Lead Shrink Dual-in-line Package (SDIP) ............................................ 87
PS001301-0800
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