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SN8P1602A Datasheet(PDF) 28 Page - SONiX Technology Company |
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SN8P1602A Datasheet(HTML) 28 Page - SONiX Technology Company |
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28 / 76 page  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 - - - - R/W R/W R/W After reset 0 - - - - 1 1 1 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 R/W After reset - - - - - - 0 0 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 R/W R/W R/W R/W R/W R/W R/W After reset 0 0 0 0 0 0 0 0 For SN8P1602B : STKn = <STKnH , STKnL> (n = 3 ~ 0) |
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