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SMBP2501BPB Datasheet(PDF) 34 Page - SONiX Technology Company |
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SMBP2501BPB Datasheet(HTML) 34 Page - SONiX Technology Company |
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34 / 107 page  SN8P2501B 8-Bit Micro-Controller SONiX TECHNOLOGY CO., LTD Page 34 Version 2.1 2.3.2 STACK REGISTERS The stack pointer (STKP) is a 2-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 - - - - - STKPB1 STKPB0 Read/Write R/W - - - - - R/W R/W After reset 0 - - - - - 1 1 Bit[2:0] STKPBn: Stack pointer (n = 0 ~ 1) 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, #00000011B B0MOV STKP, A 0F0H~0F8H 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 0F0H~0F8H 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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