MC908GR8CDWE Datasheet, PDF (140/408 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Freescale Semiconductor, Inc.
Central Processing Unit (CPU)
• 64K byte program/data memory space
• 16 addressing modes
• Memory-to-memory data moves without using accumulator
• Fast 8-bit by 8-bit multiply and 16-bit by 8-bit divide instructions
• Enhanced binary-coded decimal (BCD) data handling
• Modular architecture with expandable internal bus definition for
extension of addressing range beyond 64K bytes
• Low-power stop and wait modes
10.4 CPU registers
Figure 10-1 shows the five CPU registers. CPU registers are not part of
the memory map.
15
H
15
15
7
0
ACCUMULATOR (A)
0
X
INDEX REGISTER (H:X)
0
STACK POINTER (SP)
0
PROGRAM COUNTER (PC)
7
0
V 1 1 H I N Z C CONDITION CODE REGISTER (CCR)
CARRY/BORROW FLAG
ZERO FLAG
NEGATIVE FLAG
INTERRUPT MASK
HALF-CARRY FLAG
TWO’S COMPLEMENT OVERFLOW FLAG
Figure 10-1. CPU registers
Technical Data
140
MC68HC908GR8 — Rev 4.0
Central Processing Unit (CPU)
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