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SN8F2280 Datasheet(PDF) 39 Page - SONiX Technology Company |
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SN8F2280 Datasheet(HTML) 39 Page - SONiX Technology Company |
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39 / 163 page  SN8F2280 Series USB 2.0 Full-Speed 8-Bit Micro-Controller SONiX TECHNOLOGY CO., LTD Page 39 Version 1.1 2.3 STACK OPERATION 2.3.1 OVERVIEW The stack buffer has 8-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 = 7 STKP = 6 STKP = 5 STKP = 4 STACK Level STK7H STK6H STK5H STK4H STACK Buffer High Byte PCH STKP STK7L STK6L STK5L STK4L STACK Buffer Low Byte PCL STKP STKP - 1 STKP + 1 STKP = 3 STKP = 2 STKP = 1 STKP = 0 STK3L STK2L STK1L STK0L STK3H STK2H STK1H STK0H |
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