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SN8P2613 Datasheet(PDF) 35 Page - SONiX Technology Company

Part # SN8P2613
Description  8-Bit Micro-Controller
PDF  102 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  SONIX [SONiX Technology Company]
Direct Link  http://www.sonix.com.tw
Logo SONIX - SONiX Technology Company

SN8P2613 Datasheet(HTML) 35 Page - SONiX Technology Company

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SN8P2610 Series
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 35
Version 1.3
2.3.2 STACK REGISTERS
The stack pointer (STKP) is a 3-bit register to store the address used to access the stack buffer, 10-bit data memory
(STKnH and STKnL) set aside for temporary storage of stack addresses.
The two stack operations are writing to the top of the stack (push) and reading from the top of stack (pop). Push
operation decrements the STKP and the pop operation increments each time. That makes the STKP always point to
the top address of stack buffer and write the last program counter value (PC) into the stack buffer.
The program counter (PC) value is stored in the stack buffer before a CALL instruction executed or during interrupt
service routine. Stack operation is a LIFO type (Last in and first out). The stack pointer (STKP) and stack buffer
(STKnH and STKnL) are located in the system register area bank 0.
0DFH
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
STKP
GIE
-
-
-
-
STKPB2
STKPB1
STKPB0
Read/Write
R/W
-
-
-
-
R/W
R/W
R/W
After reset
0
-
-
-
-
1
1
1
Bit[2:0]
STKPBn:
Stack pointer (n = 0 ~ 2)
Bit 7
GIE:
Global interrupt control bit.
0 = Disable.
1 = Enable. Please refer to the interrupt chapter.
Example: Stack pointer (STKP) reset, we strongly recommended to clear the stack pointers in the
beginning of the program.
MOV
A, #00000111B
B0MOV
STKP, A
0F0H~0FFH
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
STKnH
-
-
-
-
-
SnPC10
SnPC9
SnPC8
Read/Write
-
-
-
-
-
R/W
R/W
R/W
After reset
-
-
-
-
-
0
0
0
0F0H~0FFH
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
STKnL
SnPC7
SnPC6
SnPC5
SnPC4
SnPC3
SnPC2
SnPC1
SnPC0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
After reset
0
0
0
0
0
0
0
0
STKn = STKnH , STKnL (n = 3 ~ 0)



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