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.