參數(shù)資料
型號: MC68HC11D3CFN3
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 66/138頁
文件大小: 1047K
代理商: MC68HC11D3CFN3
MC68HC711D3 Data Sheet, Rev. 2.1
Freescale Semiconductor
33
Chapter 3
Central Processor Unit (CPU)
3.1 Introduction
This section presents information on M68HC11 central processor unit (CPU):
Architecture
Data types
Addressing modes
Instruction set
Special operations such as subroutine calls and interrupts
The CPU is designed to treat all peripheral, input/output (I/O), and memory locations identically as
addresses in the 64-Kbyte memory map. This is referred to as memory-mapped I/O. I/O has no
instructions separate from those used by memory. This architecture also allows accessing an operand
from an external memory location with no execution time penalty.
3.2 CPU Registers
M68HC11 CPU registers are an integral part of the CPU and are not addressed as if they were memory
locations. The seven registers, discussed in the following paragraphs, are shown in Figure 3-1.
Figure 3-1. Programming Model
A:B
70
15
0
ACCUMULATOR A
ACCUMULATOR B
DOUBLE ACCUMULATOR D
INDEX REGISTER X
INDEX REGISTER Y
STACK POINTER
PROGRAM COUNTER
70
C
V
Z
N
I
H
X
S
D
IX
IY
SP
PC
CARRY
OVERFLOW
ZERO
NEGATIVE
I INTERRUPT MASK
HALF CARRY (FROM BIT 3)
X INTERRUPT MASK
STOP DISABLE
CCR
15
0
CONDITION CODE REGISTER
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