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