GENERAL DESCRIPTION
INTRODUCTION
The ST7285C HCMOS Microcontroller Unit is a member of the ST7 family of Microcontrollers dedicated to car radio applications with RDS capability. The device is based on an industry-standard 8-bit core and features an enhanced instruction set.

■ 4.5V to 5.5V Supply Operating Range
■ Operates at 8.664MHz Oscillator Frequency for RDS compatibility
■ Fully Static operation
■ -40°C to + 85°C Maximum Operating Temperature Range
■ Run, Wait, Slow, Halt and RAM Retention modes
■ User ROM: 48 Kbytes
■ Data RAM: 3 Kbytes, including 128 byte stack
■ 80 pin plastic package
■ 62 multifunctional bidirectional I/O lines:
    – Programmable Interrupt inputs on some I/Os
    – 8 Analog inputs
    – EMI filtering
■ Two 16-bit Timers, each featuring:
    – 2 Input Captures
    – 2 Output Compares
    – External Clock input (on Timer A)
    – PWM and Pulse Generator modes
■ RDS Radio Data System Filter, Demodulator and GBS circuits
■ 8-bit Analog-to-Digital converter with 8 channel analog multiplexer
■ Digital Watchdog
■ Two SPI Serial Peripheral Interfaces
■ SCI Serial Communications Interface
■ Full I2C multiple Master/Slave interface
■ 2KHz Beep signal generator
■ Master Reset and Power-On Reset
■ 8-bit Data Manipulation
■ 63 Basic Instructions
■ 17 main Addressing Modes
■ 8 x 8 Unsigned Multiply Instruction
■ True Bit Manipulation
■ Complete Development Support on PC/DOS/ WindowsTM Real-Time Emulator
■ Full Software Package (C-Compiler, Cross-Assembler, Debugger)