mc68hc05bs8 Freescale Semiconductor, Inc, mc68hc05bs8 Datasheet - Page 89

• Manufacturer Part Number: mc68hc05bs8
• Description: Mc68hc05 Family Of Low-cost Single-chip Microcontrollers.
• Manufacturer: Freescale Semiconductor, Inc

This section provides a description of the CPU core registers, the instruction set and the
addressing modes of the MC68HC05BS8.
10.1
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.
10.1.1
The accumulator is a general purpose 8-bit register used to hold operands and results of
arithmetic calculations or data manipulations.
MC68HC05BS8
CPU CORE AND INSTRUCTION SET
Registers
Accumulator (A)
15
15
0
0
0 0 0 0 0 0 0 1 1
0
CPU CORE AND INSTRUCTION SET
Figure 10-1 Programming model
1 1 1 H I N Z C
7
7
7
7
7
10
0
0
0
0
0
Accumulator
Index register
Program counter
Stack pointer
Condition code register
Carry / borrow
Zero
Negative
Interrupt mask
Half carry
TPG
10