Datasheet

MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor 19
Chapter 1
General Description
1.1 Introduction
The MC68HC908AP64 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.
1.2 Features
Features of the MC68HC908AP64 include the following:
• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
• Maximum internal bus frequency:
– 8-MHz at 5V or 3V operating voltage
• Clock input options:
– RC-oscillator
– 32-kHz crystal-oscillator with 32MHz internal PLL
• User program FLASH memory with security
(1)
feature
– 62,368 bytes for MC68HC908AP64
– 32,768 bytes for MC68HC908AP32
– 16,384 bytes for MC68HC908AP16
– 8,192 bytes for MC68HC908AP8
• On-chip RAM
– 2,048 bytes for MC68HC908AP64 and MC68HC908AP32
– 1,024 bytes for MC68HC908AP16 and MC68HC908AP8
• Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2) with selectable input capture,
output compare, and PWM capability on each channel
Table 1-1. Summary of Device Variations
Device
RAM Size
(bytes)
FLASH Memory Size
(bytes)
MC68HC908AP64 2,048 62,368
MC68HC908AP32 2,048 32,768
MC68HC908AP16 1,024 16,384
MC68HC908AP8 1,024 8,192
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
unauthorized users.