MC68HC908RF2 Datasheet, PDF (26/254 Pages) Motorola, Inc – HCMOS Microcontroller Unit

General Description
1.3 Features
Advance Information
26
Features of the MC68HC908RF2 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 security⁽¹⁾
• 128 bytes of on-chip RAM
• 16-bit, 2-channel timer interface module (TIM)
• 12 general-purpose input/output (I/O) ports:
– Six shared with keyboard wakeup function
– Two shared with the timer module
– Port A pins have 3-mA sink capabilities
• Low-voltage inhibit (LVI) 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)
• Ultra high frequency (UHF) transmitter
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
MC68HC908RF2 — Rev. 1
MOTOROLA