The MC68HC05B6 microcomputer (MCU) is a member of Motorola's
MC68HC05 family of low-cost single chip microcomputers. This
8-bit MCU contains an on-chip oscillator, CPU, RAM, ROM,
EEPROM, A/D converter, pulse length modulated outputs, I/O,
serial communications interface, programmable timer system
and watchdog. The fully static design allows operation at
frequencies down to dc to further reduce the already low
power consumption to a few micro-amps.


Hardware features
* Fully static design featuring the industry standard M68HC05 family CPU core
* On chip crystal oscillator with divide by 2 or a software selectable divide by 32 option (SLOW mode)
* 2.1 MHz internal operating frequency at 5V; 1.0 MHz at 3V
* 176 bytes of RAM
* 5936 bytes of user ROM plus 14 bytes of user vectors
* 256 bytes of byte erasable EEPROM with internal charge pump and security bit
* Write/erase protect bit for 224 of the 256 bytes EEPROM
* Self test/bootstrap mode
* Power saving STOP, WAIT and SLOW modes
* Three 8-bit parallel I/O ports and one 8-bit input-only port
* Software option available to output the internal E-clock to port pin PC2
* 16-bit timer with 2 input captures and 2 output compares
* Computer operating properly (COP) watchdog timer
* Serial communications interface system (SCI) with independent transmitter/receiver baud rate
selection; receiver wake-up function for use in multi-receiver systems
* 8 channel A/D converter
* 2 pulse length modulation systems which can be used as D/A converters
* One interrupt request input plus 4 on-board hardware interrupt sources
* Available in 52-pin plastic leaded chip carrier (PLCC), 64-pin quad flat pack (QFP) and 56-pin
shrink dual in line (SDIP) packages