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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SN8P1602AX 데이터시트(PDF) 30 Page - SONiX Technology Company |
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SN8P1602AX 데이터시트(HTML) 30 Page - SONiX Technology Company |
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30 / 94 page  SN8P1600 8-bit micro-controller SONiX TECHNOLOGY CO., LTD Page 30 Revision 1.94 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 and reading from the top of stack. 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 STKPBn: Stack pointer. (n = 0 ~ 2) GIE: Global interrupt control bit. 0 = disable, 1 = enable. There is more on this in interrupt chapter. Example: Stack pointer (STKP) reset routine. MOV A, #00000111B B0MOV STKP, A STKn = <STKnH , STKnL> (n = 3 ~ 0) SN8P1602/1603 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 SN8P1604 0F0H~0FFH Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 STKnH - - - - SnPC11 SnPC10 SnPC9 SnPC8 Read/Write - - - - R/W R/W R/W R/W After reset - - - - 0 0 0 0 SN8P1602/1603/1604 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 STKnH: Store PCH data as interrupt or call executing. The n expressed 0 ~3. STKnL: Store PCL data as interrupt or call executing. The n expressed 0 ~3. |
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