GENERAL DESCRIPTION

This data sheet details the specific properties of the PCF84C85A. The shared properties of the PCF84CxxxA family of microcontrollers are described in the “PCD84xxxA family” data sheet which should be read in conjunction with this publication.

The PCF84C85A is a general purpose CMOS microcontroller with emphasis on input/output. It provides 32 I/O port lines, 8 kbytes of program memory and 256 bytes of RAM. In addition to the 32 I/O port lines, the microcontroller provides an on-chip I2C-bus interface. This two-line serial bus extends the microcontrollers capabilities when implemented with the powerful I2C-bus peripherals.These include LCD drivers, telecom circuits, AD/DA converters, clock/calendar circuits, EEPROM and RAM and are listed in “Data Handbook IC12, I2C Peripherals”

FEATURES

• 8-bit CPU, ROM, RAM, I/O in a single 40-lead package

• 8 kbytes ROM

• 256 bytes RAM

• I2C-bus interface with multi-master capability

• Over 100 instructions (based on MAB8048) all of 1 or 2 cycles

• 32 quasi-bidirectional I/O port lines

• 8-bit programmable timer/event counter 1

• Three single-level vectored interrupts:

– external

– 8-bit programmable timer/event counter 1

– I2C-bus

• Two test inputs, one of which also serves as the external interrupt input

• Stop and Idle modes

• Logic supply voltage: VDD = 2.5 to 5.5 V

• Clock frequency: 1 to 16 MHz

• Operating temperature: −40 to +85 °C

• Manufactured in silicon gate CMOS process.