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參數資料
型號: MC68HC11A8BCFU2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Single-Chip Microcontroller
中文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP64
封裝: QFP-64
文件頁數: 100/158頁
文件大?。?/td> 776K
代理商: MC68HC11A8BCFU2
MOTOROLA
10-2
CPU, ADDRESSING MODES, AND INSTRUCTION SET
MC68HC11A8
TECHNICAL DATA
10
Figure 10-1 Programming Model
10.1.3 Index Register Y (IY)
The 16-bit IY register is also used for indexed mode addressing similar to the IX reg-
ister; however, all instructions using the IY register require an extra byte of machine
code and an extra cycle of execution time since they are two byte opcodes.
10.1.4 Stack Pointer (SP)
The stack pointer (SP) is a 16-bit register that contains the address of the next free
location on the stack. The stack is configured as a sequence of last-in-first-out read/
write registers which allow important data to be stored during interrupts and subroutine
calls. Each time a new byte is added to the stack (a push instruction), the SP is dec-
rement; whereas, each time a byte is removed from the stack (a pull instruction) the
SP is incremented.
10.1.5 Program Counter (PC)
The program counter is a 16-bit register that contains the address of the next instruc-
tion to be executed.
10.1.6 Condition Code Register (CCR)
The condition code register is an 8-bit register in which each bit signifies the results of
the instruction just executed. These bits can be individually tested by a program and
a specific action can be taken as a result of the test. Each individual condition code
register bit is explained below.
8-BIT ACCUMULATORS A & B
OR 16-BIT DOUBLE ACCUMULATOR D
7
15
0
7
0
0
A
B
D
IX
IY
SP
PC
7
0
C
V
Z
N
I
H
X
S
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
相關PDF資料
PDF描述
MC68HC11A8BCP2 HCMOS Single-Chip Microcontroller
MC68HC11A8BMP2 HCMOS Single-Chip Microcontroller
MC68HC11A8BVP2 HCMOS Single-Chip Microcontroller
MC68HC11A1CFN2 HCMOS Single-Chip Microcontroller
MC68HCP11A1CFN2 HCMOS Single-Chip Microcontroller
相關代理商/技術參數
參數描述
MC68HC11A8BCP2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A8BMP2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A8BVP2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A8FN 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11A8FN1 制造商:Motorola Inc 功能描述:
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