MC68HC05P9A Datasheet, PDF (30/158 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
CPU
CPU Control Unit
The CPU control unit fetches and decodes instructions during program
operation. The control unit selects the memory locations to read and
write and coordinates the timing of all CPU operations.
Arithmetic/Logic Unit
The arithmetic/logic unit (ALU) performs the arithmetic, logic, and
manipulation operations decoded from the instruction set by the CPU
control unit. The ALU produces the results called for by the program and
sets or clears status and control bits in the condition code register
(CCR).
CPU Registers
The M68HC05 CPU contains five registers that control and monitor MCU
operation:
• Accumulator
• Index register
• Stack pointer
• Program counter
• Condition code register
CPU registers are not memory mapped.
8-hc05cpu
30
CPU
MOTOROLA
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