Datasheet

MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
Freescale Semiconductor 17
Chapter 1
General Description
1.1 Introduction
The MC68HC908KX8 is a member of the low-cost, high-performance M68HC08 Family of 8-bit
microcontroller units (MCU). The M68HC08 Family is based on the customer-specified integrated circuit
(CSIC) design strategy. 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 is this document pertains to the MC68HC908KX2 and the MC68HC08KX8 with
the exceptions found in:
• Appendix A MC68HC908KX2
• Appendix B MC68HC08KX8
1.2 Features
Features include:
• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
• Maximum internal bus frequencies of:
– 8 MHz at 5.0 V
– 4 MHz at 3.0 V
• Internal oscillator requiring no external components:
– Software selectable bus frequencies
– 25 percent accuracy with trim capability to 2 percent
– Clock monitor
– Option to allow use of external clock source or external crystal/ceramic resonator
• Eight Kbytes of on-chip, in-circuit programmable FLASH memory
• FLASH program memory security
(1)
• On-chip programming firmware for use with host personal computer which does not require high
voltage for entry
• 192 bytes of on-chip random-access memory (RAM)
• 16-bit, 2-channel timer interface (TIM) module
• 4-channel, 8-bit, analog-to-digital converter (ADC) with high-voltage reference (V
REFH
) double
bonded to V
DD
pin
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
unauthorized users.