GENERAL DESCRIPTION

The PCA84C646 and PCA84C846 are 8-bit microcontrollers with enhanced OSD and VST functions. The PCA84C646 and PCA84C846 are members of the PCA84C640 CMOS microcontroller family. They include the PCF84CXXXA processor core, 6 or 8 kbytes of ROM and 192 bytes of RAM.

FEATURES

PCF84CXXXA kernel

? 8-bit CPU, ROM, RAM, I/O and derivative logic in one package

? Over 80 instructions

? All instructions of 1 or 2 cycles

? Quasi-bidirectional standard I/O port lines (P0, P1)

? Configuration of I/O lines individually selected by mask

? External interrupt INT/T0

? 2 direct testable inputs T0, T1

? 8-bit timer/event counter

? Single level vectored interrupt: external (INT), counter/timer, I2C-bus and VSYNC

? Configuration of optimal on-chip oscillator transconductance by mask

? On-chip oscillator clock frequency: 1 to 10 MHz

? Power-on-reset and low-voltage detector

? Low standby voltage and current in Idle and Stop modes

? Single power supply: 4.5 to 5.5 V

? Operating temperature: ?20 to +70 °C.

VST and OSD derivative

? 6 kbytes (PCA84C646) or 8 kbytes (PCA84C846) system ROM, 192 bytes system RAM

? A multi-master I2C-bus interface

? One 14-bit PWM output for VST

? Three AFC inputs with 4-bit DAC and comparator

? Four 6-bit PWM and four 7-bit PWM outputs (DACs for analog controls)

? Eight port lines with 10 mA LED drive (at ≤1.2 V) capability

? Programmable active level polarities of VSYNC/HSYNC

? Display RAM: 64 × 10-bit

? Display character fonts: 64 (62 customized + 2 special reserved codes)

? Display starting position: 64 different positions by software control, both vertical and horizontal

? Character size: 4 different character sizes, line-by-line basis, 1 dot = 1H/1V, 2H/2V, 3H/3V, 4H/4V. (H: OSD clock period, V: number of horizontal scan line height)

? Character matrix: 12 × 18 with no spacing between characters

? Foreground colours: 8, character-by-character basis

? Background colours: 8, word-by-word basis. Available when background is either in North-west shadowing, Box shadowing and Frame shadowing mode

? Background/shadowing modes: 4, No background, North-west shadowing, Box shadowing, Frame shadowing (raster blanking), frame basis

? On-chip oscillator for On Screen Display (OSD) function

? Character blinking rate: 1 : 1, 1 : 3, 3 : 1 (frequency: 1?16, 1?32, 1?64 or 1?128 of fVSYNC, programmable), character basis

? Display format: flexible display format by using Carriage Return (CR) code

? Spacing between lines: 4 different choices, from 0, 4, 8 or 12 horizontal scan lines

? Auto display character RAM address post increment when writing data

? On-chip Power-on-reset

? VSYNC leading edge can generate interrupt (programmable enable/disable by software)

? 8-bit counter triggered by external pulse input.