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SN8A1702AX データシート(PDF) 29 Page - SONiX Technology Company |
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SN8A1702AX データシート(HTML) 29 Page - SONiX Technology Company |
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29 / 112 page ![]() Preliminary SN8P1702A/SN8P1703A 8-bit micro-controller build-in 12-bit ADC SONiX TECHNOLOGY CO., LTD Page 29 Revision 0.5 STACK OPERATIONS OVERVIEW The stack buffer of SN8P1702A/SN8P1703A has 8-level high area and each level is 12-bits length. This buffer is designed to save and restore program counter’s (PC) data when interrupt service is executed. The STKP register is a pointer designed to point active level in order to save or restore data from stack buffer for kernel circuit. The STKnH and STKnL are the 12-bit stack buffers to store program counter (PC) data. Figure 3-3 Stack-Save and Stack-Restore Operation STACK BUFFER STK7H STK6H STK5H STK4H STK3H STK2H STK1H STK0H STK7L STK6L STK5L STK4L STK3L STK2L STK1L STK0L STKP = 0 STKP = 1 STKP = 2 STKP = 3 STKP = 4 STKP = 5 STKP = 6 STKP = 7 STKP - 1 STKP + 1 CALL / interrupt RET / RETI STKP PCH PCL STKP STACK BUFFER STK7H STK6H STK5H STK4H STK3H STK2H STK1H STK0H STK7L STK6L STK5L STK4L STK3L STK2L STK1L STK0L STK7H STK6H STK5H STK4H STK3H STK2H STK1H STK0H STK7L STK6L STK5L STK4L STK3L STK2L STK1L STK0L STKP = 0 STKP = 1 STKP = 2 STKP = 3 STKP = 4 STKP = 5 STKP = 6 STKP = 7 STKP = 0 STKP = 1 STKP = 2 STKP = 3 STKP = 4 STKP = 5 STKP = 6 STKP = 7 STKP - 1 STKP + 1 STKP - 1 STKP - 1 STKP + 1 CALL / interrupt RET / RETI STKP STKP PCH PCL PCH PCH PCL PCL STKP STKP |
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