Z90356

The Z90356 is designed as the ROM and OTP versions of a television controller with on-screen display (OSD) that contains 64 KWords of program memory and 1K words of RAM.The Z90356 Television Controller with OSD is based on ZiLOG's Z89C00 RISC processor core.The Z89C00 is a second-generation, 16-bit,fractional,two's complement CMOS Digital Signal Processor (DSP).Most instructions are accomplished in a single clock cycle. This processor features a 24-bit Arithmetic Logic Unit (ALU) and a 24-bit Accumulator.The processor also contains a six-level stack and three vectored interrupts.

The absolute maximum and minimum ratings of the Z90356 are:(1)power supply voltage:0 to 7 V;(2)input voltage:-0.3 to Vcc+0.3 V;(3)output voltage:-0.3 to Vcc+0.3 V;(4)output current hign:-10 mA;(5)output current high:-100 mA;(6)output current low:20 mA;(7)operating temperature:0 to 70;(8)storage temperature:-65 to 150.

The Z90356 provides the ability to decode closed-caption transmissions;display characters on the screen;manipulate analog and digital control circuits; monitor keypad and infrared signals directly and generate OSD if the Z90356 receives vertical and horizontal synchronization signals.The FLYBACK signals from the deflection coils are fed back to the Z90356. The controller uses these signals to align its video signals with those of the normal display. If the composite video signal is not present, video synchronization is provided by the controller. In this case, the SYNC signal pins are set to be outputs.