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MC68HC05E0 Datasheet, PDF (23/96 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit | |||
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3
3
CPU CORE AND INSTRUCTION SET
This section provides a description of the CPU core registers, the instruction set and the
addressing modes of the MC68HC05E0.
3.1
Registers
The MCU contains ï¬ve registers, as shown in the programming model of Figure 3-1. The interrupt
stacking order is shown in Figure 3-2.
7
0
7
0
15
7
0
0
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
Figure 3-1 Programming model
3.1.1 Accumulator (A)
The accumulator is a general purpose 8-bit register used to hold operands and results of
arithmetic calculations or data manipulations.
MC68HC05E0
CPU CORE AND INSTRUCTION SET
MOTOROLA
3-1
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