SN8P1602B View Datasheet(PDF) - Sonix Technology Co., Ltd
Part Name
Description
MFG CO.
'SN8P1602B' PDF : 76 Pages View PDF
SN8P1602B
8-Bit Micro-Controller
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.
SN8P1602B
Stack Level
0
1
2
3
4
>4
STKP Register
STKPB2 STKPB1 STKPB0
1
1
1
1
1
0
1
0
1
1
0
0
0
1
1
0
1
0
Stack Buffer
High Byte Low Byte
Free
Free
STK0H
STK0L
STK1H
STK1L
STK2H
STK2L
STK3H
STK3L
-
-
Description
-
-
-
-
-
Stack Over, error
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.
SN8P1602B
Stack Level
4
3
2
1
0
STKP Register
STKPB2 STKPB1 STKPB0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Stack Buffer
High Byte Low Byte
STK3H
STK3L
STK2H
STK2L
STK1H
STK1L
STK0H
STK0L
Free
Free
Description
-
-
-
-
-
PROGRAM COUNTER
The program counter (PC) is a 10-bit binary counter separated into the high-byte 2 and the low-byte 8 bits. This
counter is responsible for pointing a location in order to fetch an instruction for kernel circuit. Normally, the program
counter is automatically incremented with each instruction during program execution.
Besides, it can be replaced with specific address by executing CALL or JMP instruction. When JMP or CALL instruction
is executed, the destination address will be inserted to bit 0 ~ bit 9.
SN8P1602B
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PC -
-
-
-
-
- PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0
After
reset
-
-
-
-
-
-
0000000000
PCH
PCL
SONiX TECHNOLOGY CO., LTD
Page 29
Version 1.2
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