MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 82

• Manufacturer Part Number: MC68HC708AS48
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Central Processor Unit (CPU)
7.4.2 Index Register
Advance Information
82
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.
Reset:
Read:
Write:
X = Indeterminate
Bit
15
0
14
Central Processor Unit (CPU)
0
13
0
Figure 7-3. Index Register (H:X)
12
0
11
0
10
0
9
0
8
0
X
7
X
6
MC68HC708AS48
X
5
X
4
X
3
MOTOROLA
X
2
—
Rev. 4.0
1
X
Bit
0
X