Datasheet

Central Processing Unit (CPU)
Technical Data MC68HC908GR8 — Rev 4.0
140 Central Processing Unit (CPU) MOTOROLA
• 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.
Figure 10-1. CPU registers
ACCUMULATOR (A)
INDEX REGISTER (H:X)
STACK POINTER (SP)
PROGRAM COUNTER (PC)
CONDITION CODE REGISTER (CCR)
CARRY/BORROW FLAG
ZERO FLAG
NEGATIVE FLAG
INTERRUPT MASK
HALF-CARRY FLAG
TWO’S COMPLEMENT OVERFLOW FLAG
V11HINZC
H X
0
0
0
0
7
15
15
15
70
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