SN8P1602A datasheet(28/76 Pages) SONIX

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SN8P1602B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 28

Version 1.1

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.

SN8P1602B

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

After reset

STKPBn: Stack pointer (n = 0 ~ 2)

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

SN8P1602B

0F0H~0FFH

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

STKnH

SnPC9

SnPC8

Read/Write

R/W

After reset

STKn = <STKnH , STKnL> (n = 3 ~ 0)

SN8P1602B

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

After reset

For SN8P1602B : STKn = <STKnH , STKnL> (n = 3 ~ 0)

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