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GENERAL DESCRIPTION

The ST639x microcontrollers are members of the 8-bit HCMOS ST638x family, a series of devices specially orientedto TV applications.

■ 4.5 to 6V supply operating range

■ 8MHz Maximum Clock Frequency

■ User Program ROM: Up to 20140 bytes

■ Reserved Test ROM:Up to 340 bytes

■ Data ROM: User selectable size

■ Data RAM: 256 bytes

■ Data EEPROM: Up to 384 bytes

■ 42-Pin Shrink Dual in Line Plastic Package

■ Up to 23 software programmable general purpose Inputs/Outputs, including 2 direct LED driving Outputs

■ Two Timers each including an 8-bit counter with a 7-bit programmable prescaler

■ Digital Watchdog Function

■ Serial Peripheral Interface (SPI) supporting S-BUS/ I2C BUS and standard serial protocols

■ SPI for external frequency synthesis tuning

■ Up to Six 6-Bit PWM D/A Converters

■ AFC A/D converter with 0.5V resolution

■ Five interrupt vectors (IRIN/NMI, Timer 1 & 2, VSYNC, PWR INT.)

■ On-chip clock oscillator

■ 5 Lines by 15 Characters On-Screen Display Generator with 128 Characters

■ All ROM types are supported by pin-to-pin EPROM and OTP versions.

■ The development tool of the ST639x microcontrollers consists of the ST638x-EMU emulation and development system to be connected via a standard RS232 serial line to an MS-DOS Personal Computer.