参数资料
型号: SN8P1602BS
厂商: SONIX Technology Co., Ltd.
英文描述: 8-Bit Micro-Controller
中文描述: 8位微控制器
文件页数: 31/94页
文件大小: 540K
代理商: SN8P1602BS
SN8P1600
8-bit micro-controller
SONiX TECHNOLOGY CO., LTD
Page 31
Revision 1.94
STACK OPERATION EXAMPLE
The two kinds of Stack-Save operations refer to the stack pointer (STKP) and write the content of program counter (PC)
to the stack buffer are CALL instruction and interrupt service. Under each condition, the STKP decreases and points to
the next available stack location. The stack buffer stores the program counter about the op-code address. The
Stack-Save operation is as the following table.
STKP Register
Stack Level
STKPB2
STKPB1
STKPB0
0
1
1
1
1
1
1
0
2
1
0
1
3
1
0
0
4
0
1
1
> 4
0
1
0
There are Stack-Restore operations correspond to each push operation to restore the program counter (PC). The RETI
instruction uses for interrupt service routine. The RET instruction is for CALL instruction. When a pop operation occurs,
the STKP is incremented and points to the next free stack location. The stack buffer restores the last program counter
(PC) to the program counter registers. The Stack-Restore operation is as the following table.
STKP Register
Stack Level
STKPB2
STKPB1
STKPB0
4
0
1
1
3
1
0
0
2
1
0
1
1
1
1
0
0
1
1
1
Stack Buffer
High Byte
Free
STK0H
STK1H
STK2H
STK3H
-
Low Byte
Free
STK0L
STK1L
STK2L
STK3L
-
Description
-
-
-
-
-
Stack Over, error
Stack Buffer
High Byte
STK3H
STK2H
STK1H
STK0H
Free
Low Byte
STK3L
STK2L
STK1L
STK0L
Free
Description
-
-
-
-
-
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