Philips Semiconductors
Telecom microcontrollers
Product specification
PCF84C21A; PCF84C41A;
PCF84C81A
1 FEATURES
• Manufactured in silicon gate CMOS process
• 8-bit CPU, ROM, RAM, I/O in a 28-lead package
• 2 kbyte ROM, 64 byte RAM (PCF84C21A)
• 4 kbyte ROM, 128 byte RAM (PCF84C41A)
• 8 kbyte ROM, 256 byte RAM (PCF84C81A)
• I2C-bus interface with multi-master capability
• Over 100 instructions (based on MAB8048) all of
1 or 2 cycles
• 20 quasi-bidirectional I/O Port lines
• High sink current capability on the 8 lines of Port 1
• 8-bit programmable timer/event counter 1
• 3 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
• Supply voltage: 2.5 to 5.5 V
• Clock frequency: 1 to 16 MHz
• Operating temperature: −40 to +85 °C.
2 GENERAL DESCRIPTION
This data sheet details the specific properties of the
PCF84C21A, PCF84C41A and PCF84C81A. The shared
properties of the PCF84CxxxA family of microcontrollers
are described in the “PCF84CxxxA family” data sheet
which should be read in conjunction with this publication.
The PCF84C21A, PCF84C41A and PCF84C81A are
general purpose CMOS microcontrollers with 2 kbytes,
4 kbytes and 8 kbytes of program memory and 64,128 and
256 bytes of RAM, respectively. In addition to 20 I/O port
lines, the microcontrollers provide an on-chip I2C-bus
interface. This two-line serial bus extends the
microcontroller capabilities when implemented with the
powerful I2C-bus peripherals. These include LCD drivers,
I/O expanders, telecom circuits, ADC and DAC converters,
clock/calendar circuits, EEPROM and RAM and are listed
in “Data Handbook IC12, I2C Peripherals”.
The instruction set is based on that of the MAB8048 and
is a sub-set of that listed in the “PCF84CxxxA family” data
sheet.
3 ORDERING INFORMATION (see note 1)
TYPE NUMBER
PCF84C21AP
PCF84C41AP
PCF84C81AP
PCF84C21AT
PCF84C41AT
PCF84C81AT
NAME
DIP28
PACKAGE
DESCRIPTION
plastic dual in-line package; 28 leads (600 mil)
SO28 plastic small outline package; 28 leads; body width 7.5 mm
VERSION
SOT117-1
SOT136-1
Note
1. Please refer to the Order Entry Form (OEF) for these devices for the full type number to use when ordering. This type
number will also specify the required program and the ROM mask options.
1996 Nov 20
3