MC68HC705C9A Datasheet, PDF (13/118 Pages) Motorola, Inc – Microcontrollers

Chapter 1
General Description
1.1 Introduction
The MC68HC705C9A HCMOS microcomputer is a member of the M68HC05 Family. The
MC68HC705C9A is the EPROM version of the MC68HC05C9A and also can be configured as the
EPROM version of the MC68HC05C12A. The MC68HC705C9A memory map consists of 12,092 bytes
of user EPROM and 176 bytes of RAM when it is configured as an MC68HC05C12A and 15,932 bytes of
user EPROM and 352 bytes of RAM when configured as an MC68HC05C9A. The MC68HC705C9A
includes a serial communications interface, a serial peripheral interface, and a 16-bit capture/compare
timer.
1.2 Features
Features include:
• Programmable mask option register (MOR) for C9A/C12A configuration
• Programmable MOR for port B pullups and interrupts
• Popular M68HC05 central processor unit (CPU)
• 15,932 bytes of EPROM (12,092 bytes for C12A configuration)
• 352 bytes of RAM (176 for C12A configuration)
• Memory mapped input/output (I/O)
• 31 bidirectional I/O lines (24 I/O + 6 input only for C12A configuration) with high current sink and
source on PC7
• Asynchronous serial communications interface (SCI)
• Synchronous serial peripheral interface (SPI)
• 16-bit capture/compare timer
• Computer operating properly (COP) watchdog timer and clock monitor
• Power-saving wait and stop modes
• On-chip crystal oscillator connections
• Single 3.0 volts to 5.5 volts power supply requirement
• EPROM contents security⁽¹⁾ feature
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the EPROM difficult for
unauthorized users.
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
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