MC68HC705BD3 FREESCALE [Freescale Semiconductor, Inc], MC68HC705BD3 Datasheet - Page 73

• Manufacturer Part Number: MC68HC705BD3
• Description: High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

This section provides a description of the CPU core registers, the instruction set and the
addressing modes of the MC68HC05BD3.
9.1
The MCU contains five registers, as shown in the programming model of Figure 9-1. The interrupt
stacking order is shown in Figure 9-2.
9.1.1
The accumulator is a general purpose 8-bit register used to hold operands and results of
arithmetic calculations or data manipulations.
MC68HC05BD3
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 9-1 Programming model
1 1 1 H I N Z C
7
7
7
7
7
9
0
0
0
0
0
Accumulator
Index register
Program counter
Stack pointer
Condition code register
Carry / borrow
Zero
Negative
Interrupt mask
Half carry
TPG
9-1
9