Central Processor Unit (CPU)
Technical Data MC68HC908AB32 — Rev. 1.0
106 Central Processor Unit (CPU) MOTOROLA
A Accumulator
n
Any bit
C Carry/borrow bit
opr
Operand (one or two bytes)
CCR Condition code register PC Program counter
dd Direct address of operand PCH Program counter high byte
dd rr Direct address of operand and relative offset of branch instruction PCL Program counter low byte
DD Direct to direct addressing mode REL Relative addressing mode
DIR Direct addressing mode
rel
Relative program counter offset byte
DIX+ Direct to indexed with post increment addressing mode rr Relative program counter offset byte
ee ff High and low bytes of offset in indexed, 16-bit offset addressing SP1 Stack pointer, 8-bit offset addressing mode
EXT Extended addressing mode SP2 Stack pointer 16-bit offset addressing mode
ff Offset byte in indexed, 8-bit offset addressing SP Stack pointer
H Half-carry bit U Undefined
H Index register high byte V Overflow bit
hh ll High and low bytes of operand address in extended addressing X Index register low byte
I Interrupt mask Z Zero bit
ii Immediate operand byte & Logical AND
IMD Immediate source to direct destination addressing mode | Logical OR
IMM Immediate addressing mode ⊕ Logical EXCLUSIVE OR
INH Inherent addressing mode ( ) Contents of
IX Indexed, no offset addressing mode –( ) Negation (two’s complement)
IX+ Indexed, no offset, post increment addressing mode # Immediate value
IX+D Indexed with post increment to direct addressing mode « Sign extend
IX1 Indexed, 8-bit offset addressing mode ← Loaded with
IX1+ Indexed, 8-bit offset, post increment addressing mode ? If
IX2 Indexed, 16-bit offset addressing mode : Concatenated with
M Memory location ↕ Set or cleared
N Negative bit — Not affected
Table 7-1. Instruction Set Summary (Continued)
Source
Form
Operation Description
Effect on
CCR
Address
Mode
Opcode
Operand
Cycles
VHINZC
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