MC68HC908AS60MFN MOTOROLA [Motorola, Inc], MC68HC908AS60MFN Datasheet - Page 116

• Manufacturer Part Number: MC68HC908AS60MFN
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Central Processor Unit (CPU)
8.4.1 Accumulator (A)
8.4.2 Index Register (H:X)
Technical Data
116
Reset:
Read:
Write:
Reset:
Read:
Write:
The accumulator is a general-purpose 8-bit register. The CPU uses the
accumulator to hold operands and the results of arithmetic/logic
operations.
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 also be used as a temporary data storage
location.
Freescale Semiconductor, Inc.
X = Indeterminate
For More Information On This Product,
Bit
15
0
Bit 7
14
0
Central Processor Unit (CPU)
Go to: www.freescale.com
13
0
6
Figure 8-3. Index Register (H:X)
12
0
Figure 8-2. Accumulator (A)
11
0
5
10
0
Unaffected by reset
9
0
4
8
0
7
X
3
X
6
MC68HC908AS60 — Rev. 1.0
X
5
2
X
4
X
3
1
X
2
MOTOROLA
X
1
Bit 0
Bit
X
0