MC68HC908RK2 Datasheet, PDF (24/232 Pages) Motorola, Inc – Microcontroller Unit

General Description
1.3 Features
Features of the MC68HC908RK2 MCU include:
• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and
M68HC05 Families
• Maximum internal bus frequency of 4 MHz at 3.3 volts
• Maximum internal bus frequency of 2 MHz at 1.8 volts
• Internal oscillator requiring no external components:
– Software selectable bus frequencies
– ±25 percent accuracy with trim capability to ±2 percent
– Option to allow use of external clock source or external
crystal/ceramic resonator
• 2 Kbytes of on-chip FLASH memory
• FLASH program memory security¹
• 128 bytes of on-chip RAM
• 16-bit, 2-channel timer interface module (TIM)
• 14 general-purpose input/output (I/O) ports:
– Six shared with keyboard wakeup function
– Three shared with the timer module
– Port A pins have 3-mA sink capabilities
• Low-voltage inhibit module:
– 1.85-V detection forces MCU into reset
– 2.0-V detection sets indicator flag
• 6-bit keyboard interrupt with wakeup feature
• External asynchronous interrupt pin with internal pullup (IRQ1)
Advance Information
24
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading
or copying the FLASH difficult for unauthorized users.
General Description
MC68HC908RK2 — Rev. 4.0
MOTOROLA