INTRODUCTION
ST6373 Microcontrollers are members of the 8-bit HCMOS ST637x family, a series of devices specially intended for Digitally Controlled Multi Frequency Monitor applications. All ST637x devices are based on a building block approach: a common core is surrounded by a combination of onchip peripherals (macrocells) available from a standard library.

■ 4.5V to 6V Operating Supply Voltage Range
■ Low Current Consumption
■ 0 to +70°C Operating Temperature Range
■ 8 MHz clock Oscillator
■ 16K bytes ROM/OTP/EPROM (8K and 12K ROM versions also available)
■ 192 bytes RAM
■ 384 bytes general purpose EEPROM
■ 128 bytes dedicated EEPROM for DDC SPI
■ 22 fully programmable I/O pins, offering direct LED drive capability, as well as interrupt generation for keyboard inputs
■ Digital WATCHDOG timer
■ Three Timers, each comprising an 8-bit counter and a 7- bit Prescaler
■ SYNC Processor:
   – 12-bits HSYNC Event Counter
   – 12-bits VSYNC Period Counter
   – HSYNC and VSYNC Polarity Detection
   – HSYNC and VSYNC Outputs
   – HFLYBACK and VFLYBACK Inputs
   – CLAMP and BLANK Outputs
■ 14-bit (PWM + BRM) D/A Converter
■ Nine 7-bit PWM D/A Converter Outputs
■ 8-bit A/D Converter with 8 multiplexed inputs
■ DDC SPI with interrupt and 4 operating modes
■ A further SPI with interrupt and 2 operating modes
■ Remote Control Signal Input (Non Maskable Interrupt)
■ VSYNC Interrupt Input
■ Five Interrupt Vectors
■ XOR Register (Instruction Set expansion)
■ MIRROR Register (Instruction Set expansion)