参数资料
型号: MC68HC11D3CFB
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 46/131页
文件大小: 1640K
代理商: MC68HC11D3CFB
MC68HC11D3
CENTRAL PROCESSING UNIT
MOTOROLA
TECHNICAL DATA
3-1
SECTION 3
CENTRAL PROCESSING UNIT
This section presents information on M68HC11 central processing unit (CPU) archi-
tecture, data types, addressing modes, the instruction set, and special operations,
such as subroutine calls and interrupts.
The CPU is designed to treat all peripheral, I/O, and memory locations identically as
addresses in the 64 Kbyte memory map. This is referred to as memory-mapped I/O.
There are no special instructions for I/O that are separate from those used for memory.
This architecture also allows accessing an operand from an external memory location
with no execution-time penalty.
3.1 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 para-
graphs, are shown in Figure 3-1.
Figure 3-1 Programming Model
8-BIT ACCUMULATORS A & B
70
15
0
AB
D
IX
IY
SP
PC
70
C
V
Z
N
I
H
X
S
OR 16-BIT DOUBLE ACCUMULATOR D
INDEX REGISTER X
INDEX REGISTER Y
STACK POINTER
PROGRAM COUNTER
CARRY/BORROW FROM MSB
OVERFLOW
ZERO
NEGATIVE
I-INTERRUPT MASK
HALF CARRY (FROM BIT 3)
X-INTERRUPT MASK
STOP DISABLE
CONDITION CODES
HC11 PROG MODEL
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