参数资料
型号: MC68711E20VFNE2
厂商: Freescale Semiconductor
文件页数: 66/138页
文件大小: 0K
描述: IC MCU 8BIT 52-PLCC
标准包装: 23
系列: HC11
核心处理器: HC11
芯体尺寸: 8-位
速度: 4MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 38
程序存储器容量: 20KB(20K x 8)
程序存储器类型: OTP
EEPROM 大小: 512 x 8
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
数据转换器: A/D 8x8b
振荡器型: 内部
工作温度: -40°C ~ 105°C
封装/外壳: 52-LCC(J 形引线)
包装: 管件
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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