MC908MR16CFUE Datasheet, PDF (17/282 Pages) Freescale Semiconductor, Inc – On-chip programming firmware for use with host personal computer, Clock generator module (CGM)

Chapter 1
General Description
1.1 Introduction
The MC68HC908MR32 is a member of the low-cost, high-performance M68HC08 Family of 8-bit
microcontroller units (MCUs). All MCUs in the family use the enhanced M68HC08 central processor unit
(CPU08) and are available with a variety of modules, memory sizes and types, and package types.
The information contained in this document pertains to the MC68HC908MR16 with the exceptions shown
in Appendix A MC68HC908MR16.
1.2 Features
Features include:
• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
• 8-MHz internal bus frequency
• On-chip FLASH memory with in-circuit programming capabilities of FLASH program memory:
MC68HC908MR32 — 32 Kbytes
MC68HC908MR16 — 16 Kbytes
• On-chip programming firmware for use with host personal computer
• FLASH data security⁽¹⁾
• 768 bytes of on-chip random-access memory (RAM)
• 12-bit, 6-channel center-aligned or edge-aligned pulse-width modulator (PWMMC)
• Serial peripheral interface module (SPI)
• Serial communications interface module (SCI)
• 16-bit, 4-channel timer interface module (TIMA)
• 16-bit, 2-channel timer interface module (TIMB)
• Clock generator module (CGM)
• Low-voltage inhibit (LVI) module with software selectable trip points
• 10-bit, 10-channel analog-to-digital converter (ADC)
• System protection features:
– Optional computer operating properly (COP) reset
– Low-voltage detection with optional reset
– Illegal opcode or address detection with optional reset
– Fault detection with optional PWM disabling
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
unauthorized users.
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Freescale Semiconductor
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