MC68HC05RC8 Datasheet, PDF (34/122 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
Central Processor Unit
7
0 _STACK
INCREASING
MEMORY
ADDRESSES
1
R
E
T
U
R
N
UNSTACK
1 1 CONDITION CODE REGISTER _I
N
ACCUMULATOR
T
E
INDEX REGISTER
R
R
PCH
U
P
PCL
T
DECREASING
MEMORY
ADDRESSES
NOTE: Since the stack pointer decrements during pushes, the PCL is stacked first,
followed by PCH, etc. Pulling from the stack is in the reverse order.
Figure 3-2. Stacking Order
3.3 Accumulator
The accumulator (A) is a general-purpose 8-bit register used to hold
operands and results of arithmetic calculations or data manipulations.
7
0
A
3.4 Index Register
The index register (X) is an 8-bit register used for the indexed
addressing value to create an effective address. The index register also
may be used as a temporary storage area.
7
0
X
General Release Specification
MC68HC05RC16 — Rev. 3.0
Central Processor Unit
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