参数资料
型号: MC68HC705SJ7CDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 89/164页
文件大小: 1165K
代理商: MC68HC705SJ7CDW
Central Processor Unit (CPU)
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
30
Freescale Semiconductor
3.3 Index Register
The index register is a general-purpose 8-bit register as shown in Figure 3-3. 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.
3.4 Stack Pointer
The stack pointer is a 16-bit register that contains the address of the next location on the stack as shown
in Figure 3-4. During a reset or after the reset stack pointer (RSP) instruction, the stack pointer initializes
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 10 most significant bits of the stack pointer are permanently fixed at 0000000011, 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.
3.5 Program Counter
The program counter is a 16-bit register that contains the address of the next instruction or operand to be
fetched as shown in Figure 3-5. The three most significant bits of the program counter are ignored
internally and appear as 111 during stacking and subroutine calls.
Normally, the address in the program counter automatically increments to the next sequential memory
location every time an instruction or operand is fetched. Jump, branch, and interrupt operations load the
program counter with an address other than that of the next sequential location.
Bit 7
654321
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 3-3. Index Register (X)
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Bit
0
Read:
0
000
00
11
Write:
Reset:
0
000
00
111
11
1
Figure 3-4. Stack Pointer (SP)
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Bit
0
Read:
11
1
Write:
Reset:
0
Loaded with vector from $1FFE and $1FFF
Figure 3-5. Program Counter (PC)
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