GENERAL DESCRIPTION

The MC68HC05F8 HCMOS microcontroller is a member of the M68HC05 family of low-cost single-chip microcontrollers. This 8-bit microcontroller unit (MCU) contains an on-chip oscillator, CPU, RAM, ROM, I/O, timer, serial peripheral interface, Manchester encoder/decoder, DTMF/melody generator, and COP watchdog monitor. This MCU is particularly suitable for cordless telephones with an answering machine.

The MC68HC705F8 is an EPROM version of the MC68HC05F8. All references to the MC68HC05F8 apply equally to the MC68HC705F8, unless otherwise stated. References specific to the MC68HC705F8 are italicized in the text.

Features

The following are some of the hardware and software features of the MC68HC05F8 single-chip microcontroller.

Hardware Features

• HCMOS technology

• 8-bit architecture

• Power saving Wait and Stop modes

• Full static operation

• 2.5V to 6V operating voltage

• 320 bytes of on-chip RAM (64 bytes for stack)

• 8K-bytes of on-chip ROM; 8K-bytes of on-chip EPROM for MC68HC705F8

• 496-bytes self-check ROM; 496-bytes bootstrap ROM for MC68HC705F8

• 8 keyboard interrupt lines

• Manchester encoder/decoder

• DTMF/melody generator

• Oscillator for 3.579MHz crystal

• 16-bit free-running programmable timer with 4 selectable prescaler frequencies

• 16-bit auto-reload timer with 4 selectable prescaler frequencies

• Computer Operating Properly (COP) watchdog monitor

• Serial peripheral interface

• 10mA high current output pins for LED direct driving

• Available in 56-pin SDIP and 64-pin QFP packages

Software Features

• Similar to MC6800

• 8 x 8 unsigned multiply instruction

• Efficient use of program space

• Versatile interrupt handling

• True bit manipulation

• Addressing modes with index addressing for tables

• Efficient instruction set

• Memory mapped I/O

• Two power saving standby modes

• Upward software compatible with the M146805 CMOS family