General Description
MCU Block Diagram
MC68HC908AB32 — Rev. 1.0 Technical Data
MOTOROLA General Description 31
• 51 general-purpose input/output (I/O) pins:
– 30 shared-function I/O pins
– 5-bit keyboard wakeup port
– Selectable pullups on inputs on port D and port F
• System protection features
– Optional computer operating properly (COP) reset
– Low-voltage detection with optional reset
– Illegal opcode detection with optional reset
– Illegal address detection with optional reset
• 64-pin quad flat pack (QFP)
Features of the CPU08 include the following:
• Enhanced HC05 programming model
• Extensive loop control functions
• 16 addressing modes (eight more than the HC05)
• 16-bit Index register and stack pointer
• Memory-to-memory data transfers
• Fast 8 × 8 multiply instruction
• Fast 16/8 divide instruction
• Binary-coded decimal (BCD) instructions
• Optimization for controller applications
• Efficient C language support
1.4 MCU Block Diagram
Figure 1-1 shows the structure of the MC68HC908AB32.
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