MC68HC05F8 Datasheet, PDF (87/126 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
10
CPU CORE AND INSTRUCTION SET
This section provides a description of the CPU core registers, the instruction set and the
addressing modes of the MC68HC05F8.
10.1
Registers
The MCU contains five registers, as shown in the programming model of Figure 10-1. The interrupt
stacking order is shown in Figure 10-2.
7
0
7
0
15
7
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
10
Figure 10-1 Programming model
10.1.1 Accumulator (A)
The accumulator is a general purpose 8-bit register used to hold operands and results of
arithmetic calculations or data manipulations.
MC68HC05F8
CPU CORE AND INSTRUCTION SET
For More Information On This Product,
Go to: www.freescale.com
TPG
MOTOROLA
10-1