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SMBP2501BPB Datasheet(PDF) 33 Page - SONiX Technology Company |
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SMBP2501BPB Datasheet(HTML) 33 Page - SONiX Technology Company |
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33 / 107 page  SN8P2501B 8-Bit Micro-Controller SONiX TECHNOLOGY CO., LTD Page 33 Version 2.1 2.3 STACK OPERATION 2.3.1 OVERVIEW The stack buffer has 4- level. These buffers are designed to push and pop up program counter’s (PC) data when interrupt service routine and “CALL” instruction are executed. The STKP register is a pointer designed to point active level in order to push or pop up data from stack buffer. The STKnH and STKnL are the stack buffers to store program counter (PC) data. RET / RETI CALL / INTERRUPT STKP = 3 STKP = 2 STKP = 1 STKP = 0 STACK Level STK3H STK2H STK1H STK0H STACK Buffer High Byte PCH STKP STK3L STK2L STK1L STK0L STACK Buffer Low Byte PCL STKP STKP - 1 STKP + 1 |
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