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MC68HC05L28 Datasheet, PDF (111/156 Pages) Motorola, Inc – Flexible general-purpose microcomputer | |||
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11
CPU CORE AND INSTRUCTION SET
This section provides a description of the CPU core registers, the instruction set and the
addressing modes of the MC68HC05L28.
11.1
Registers
The MCU contains ï¬ve registers, as shown in the programming model of Figure 11-1. The interrupt
stacking order is shown in Figure 11-2.
7
0
7
0
15
7
0
00
15
7
0
0000000011
7
0
111H I NZC
Accumulator
Index register
Program counter
Stack pointer
Condition code register
Carry / borrow
Zero
Negative
Interrupt mask
Half carry
11
Figure 11-1 Programming model
11.1.1 Accumulator (A)
The accumulator is a general purpose 8-bit register used to hold operands and results of arithmetic
calculations or data manipulations.
MC68HC05L28
CPU CORE AND INSTRUCTION SET
TPG
MOTOROLA
11-1
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