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.
Table 1-1. Summary of Device Variations
RAM Size
(bytes)
FLASH Memory Size
(bytes)
Device
MC68HC908AP64
MC68HC908AP32
MC68HC908AP16
MC68HC908AP8
2,048
2,048
1,024
1,024
62,368
32,768
16,384
8,192
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
(1)
User program FLASH memory with security 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
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
unauthorized users.
MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor
19
FREESCALE [ Freescale ]
