參數(shù)資料
型號(hào)： MC68HC05X4CDW
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： HCMOS Microcontroller Unit
中文描述： 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝： PLASTIC, SOIC-28
文件頁數(shù)： 29/156頁
文件大?。?/td> 926K
代理商： MC68HC05X4CDW
CPU
CPU Registers
MC68HC05X4 Rev 1.0
MOTOROLA
CPU
29
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
6
5
4
3
2
1
Bit 0
Reset:
Unaffected by reset
Figure 2. Accumulator
Bit 7
6
5
4
3
2
1
Bit 0
Reset:
Unaffected by reset
Figure 3. 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 4. Stack Pointer
3-cpu
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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