Z90251 Datasheet, PDF (3/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
iii
Table of Contents
1 Overview 1
1.1 Pin Assignment and Descriptions .................................................... 5
1.2 Single-Purpose Pin Descriptions ..................................................... 7
1.3 Multiplexed Pin Descriptions............................................................ 8
2 Memory Description ........................................................................ 10
2.1 Standard Register File ................................................................... 10
2.2 Expanded Register File ................................................................. 11
2.3 Program Memory ........................................................................... 11
3 Watch-Dog Timer (WDT) ................................................................ 15
4 Stop Mode and Halt Mode Operation .............................................. 16
4.1 Power-Down Halt-Mode Operation ................................................ 16
4.2 Stop Mode Operation ..................................................................... 17
4.3 STOP Mode Recovery Register .................................................... 18
5 On-Screen Display .......................................................................... 22
5.1 OSD Position ................................................................................. 22
5.2 Second Color Feature.................................................................... 25
5.3 Mesh and Halftone Effect .............................................................. 28
5.4 OSD Fade ...................................................................................... 33
5.5 Inter-Row Spacing ......................................................................... 36
5.6 Character Generation .................................................................... 37
5.7 Character Size and Smoothing Effect ............................................ 39
5.8 Fringing Effect................................................................................ 40
5.9 Display Attribute Control ................................................................ 40
5.10 HV Interrupt Processing ................................................................. 49
6 Z90255 I2C Master Interface .......................................................... 53
7 Input/Output Ports ........................................................................... 57
7.1 Port 4 Pin-Out Selection Register.................................................. 59
7.2 Port 5 Pin-Out Selection Register .................................................. 62
7.3 Port 6 Data Register ...................................................................... 63
8 Infrared Interface ............................................................................. 65
PS001301-0800