Description

The HMS9xC7132/4 is a single-chip microcontroller of the 80C51 family, which is dedicated for monitor application. It is particularly suitable for multi-sync computer monitor controller. This contains DDC interfaces to the PC host, sync-detector and sync-processor for auto-sync application, ADC, static PWM, dynamic PWM and I2C bus interface for control of the video and deflection functions of the monitor.

Features

• 80C51 core

• 32K bytes of ROM for HMS91C7132/4 (32K bytes of OTP ROM for HMS97C7132/4)

• 256 bytes of RAM and 256 bytes of XRAM for DDC operation

• Uses an external crystal of 12 MHz

• One DDC compliant interface :

- Fully supports DDC1 with dedicated hardware

- DDC2B, DDC2AB and DDC2B+ compliant dedicated hardware based on an I2C bus interface

- RAM buffer with programmable size, 128 bytes or 256 bytes, which can be used for DDC operation or shared as system RAM

• On-chip sync processor

- HSYNC frequency with 12-bit resolution

- VSYNC frequency with 12-bit resolution

- HSYNC and VSYNC polarity

- HSYNC and VSYNC presence detection

- Composite sync separation

- Free running sync. generation

- Clamping pulse output

- Pattern generation

- Separate input for a SOG signal

- Missing pulse insertion option

- HSYNC/ VSYNC change interrupt

• One multi-master/slave I2C interface (up to 400K bit/s) for control of other system IC’s

• Eight 8-bit Static PWM outputs for digital control applications

• Two 8-bit Dynamic PWM outputs for various waveform generation

• One 8-bit ADC with 4 input channels

• LED driver port ; two port lines with 15 mA drive capability

• One 8-bit port only for I/O function

• 24 derivative I/O ports configurable for alternative functions

• Watchdog timer (524ms max.)

• On-chip low VDD voltage detect and reset (reset period: 524ms)

• Operating temperature : 0
to 70

• Special idle and power-down modes with low power consumption

• Single power supply : 4.5V to 5.5V