mc68hc05ct4fn Freescale Semiconductor, Inc, mc68hc05ct4fn Datasheet - Page 32

• Manufacturer Part Number: mc68hc05ct4fn
• Description: Mc68hc05 Family Of Microcontrollers Mcus
• Manufacturer: Freescale Semiconductor, Inc

Central Processing Unit
3.3 Accumulator
3.4 Index Register
General Release Specification
The accumulator (A) is a general-purpose 8-bit register used to hold
operands and results of arithmetic calculations or data manipulations.
The index register (X) is an 8-bit register used for the indexed
addressing value to create an effective address. The index register may
also be used as a temporary storage area.
Freescale Semiconductor, Inc.
For More Information On This Product,
INCREASING
ADDRESSES
MEMORY
NOTE: Since the stack pointer decrements during pushes, the PCL is stacked
UNSTACK
first, followed by PCH, etc. Pulling from the stack is in the reverse order.
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Central Processing Unit
R
U
R
N
E
T
7
1
Figure 3-2. Stacking Order
7
7
1
1
INDEX REGISTER
ACCUMULATOR
CONDITION CODE REGISTER
PCH
PCL
X
A
0
0
0
MC68HC05CT4
N
E
R
R
U
P
T
T
I
STACK
DECREASING
ADDRESSES
MEMORY
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Rev. 2.0