mc68hc908lv8 Freescale Semiconductor, Inc, mc68hc908lv8 Datasheet - Page 166
mc68hc908lv8
Manufacturer Part Number
mc68hc908lv8
Description
M68hc08 Microcontrollers 8-bit Microcontroller With Integrated Lcd Driver
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908LV8.pdf
(218 pages)
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Central Processor Unit (CPU)
15.3.1 Accumulator
The accumulator is a general-purpose 8-bit register. The CPU uses the accumulator to hold operands and
the results of arithmetic/logic operations.
15.3.2 Index Register
The 16-bit index register allows indexed addressing of a 64-Kbyte memory space. H is the upper byte of
the index register, and X is the lower byte. H:X is the concatenated 16-bit index register.
In the indexed addressing modes, the CPU uses the contents of the index register to determine the
conditional address of the operand.
The index register can serve also as a temporary data storage location.
166
Reset:
Reset:
Read:
Write:
Read:
Write:
X = Indeterminate
15
15
15
Bit
15
0
Bit 7
14
0
H
13
0
6
12
0
Figure 15-3. Index Register (H:X)
Figure 15-2. Accumulator (A)
MC68HC908LV8 Data Sheet, Rev. 2
Figure 15-1. CPU Registers
11
7
7
V 1 1 H I N Z C
0
5
10
0
X
9
0
Unaffected by reset
4
8
0
0
0
0
0
0
X
7
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
3
X
6
X
5
2
X
4
X
3
1
2
X
Freescale Semiconductor
X
1
Bit 0
Bit
0
X
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