參數(shù)資料
型號： MC68HC705E6
廠商： 飛思卡爾半導體(中國)有限公司
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 87/140頁
文件大?。?/td> 788K
代理商： MC68HC705E6
Central Processing Unit
CPU Registers
MC68HC05E6 — Rev. 1.0
Central Processing Unit
For More Information On This Product,
Go to: www.freescale.com
3-cpu
Index Register
In the indexed addressing modes, the CPU uses the byte in the index
register to determine the conditional address of the operand.
The 8-bit index register can also serve as a temporary data storage
location.
Stack Pointer
The stack pointer is a 16-bit register that contains the address of the next
location on the stack. During a reset or after the reset stack pointer
(RSP) instruction, the stack pointer is preset to $00FF. The address in
the stack pointer decrements as data is pushed onto the stack and
increments as data is pulled from the stack.
The ten most significant bits of the stack pointer are permanently fixed
at 000000011, so the stack pointer produces addresses from $00C0 to
$00FF. If subroutines and interrupts use more than 64 stack locations,
the stack pointer wraps around to address $00FF and begins writing
over the previously stored data. A subroutine uses two stack locations.
An interrupt uses five locations.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
RESET:
Unaffected by reset
Figure 24 Accumulator
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
RESET:
Unaffected by reset
Figure 25 Index Register
BIT 15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
BIT 0
0
0
0
0
0
0
0
0
1
1
RESET:
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Figure 26 Stack Pointer
F
Freescale Semiconductor, Inc.
n
.
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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