DESCRIPTION
The MC68HC05BS8 HCMOS microcontroller is a member of the MC68HC05 Family of low-cost
single-chip microcontrollers. It is particularly suitable as a multi-sync computer monitor controller.
This 8-bit microcontroller unit (MCU) contains on-chip oscillator, CPU, RAM, ROM, EEPROM, I/O,
Timers, COP Watchdog, M-Bus Serial Interface System, PWM, and Sync Signal Processor.
The MC68HC705BS8 is an EPROM version of the MC68HC05BS8. All references to the
MC68HC05BS8 apply equally to the MC68HC705BS8, unless otherwise stated. References
specific to the MC68HC705BS8 are italicized in the text, and also, for quick reference, they are
summarized in Appendix A.

Features
• Fully static chip design featuring the industry standard 8-bit M68HC05 core
• Power saving Stop and Wait modes
• 256 bytes of RAM (64 bytes for stack)
• 10K-bytes of ROM for MC68HC05BS8
10K-bytes of EPROM for MC68HC705BS8
• 512 bytes of EEPROM
• 24 bidirectional I/O lines
• 6 keyboard interrupts
• Core timer with RTI and COP watchdog reset
• 2 M-Bus (I2C†) Serial Interfaces (one full H/W, one S/W with hardware support)
• Single channel 6-bit general purpose PWM
Single channel 7-bit raster positioning PWM
• 16-bit programmable timer with one TCAP and one TCMP
• Sync signal processor
• Low voltage reset (LVR)
• Available in 44-pin QFP package