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PIC18F258-E/SOSQTP 数据表(PDF) 41 Page - Microchip Technology |
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PIC18F258-E/SOSQTP 数据表(HTML) 41 Page - Microchip Technology |
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41 / 402 page  © 2006 Microchip Technology Inc. DS41159E-page 39 PIC18FXX8 REGISTER 4-1: STKPTR: STACK POINTER REGISTER FIGURE 4-3: RETURN ADDRESS STACK AND ASSOCIATED REGISTERS R/C-0 R/C-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 STKFUL STKUNF — SP4 SP3 SP2 SP1 SP0 bit 7 bit 0 bit 7 STKFUL: Stack Full Flag bit 1 = Stack became full or overflowed 0 = Stack has not become full or overflowed bit 6 STKUNF: Stack Underflow Flag bit 1 = Stack underflow occurred 0 = Stack underflow did not occur bit 5 Unimplemented: Read as ‘0’ bit 4-0 SP4:SP0: Stack Pointer Location bits Note: Bit 7 and bit 6 need to be cleared following a stack underflow or a stack overflow. Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared C = Clearable bit 00011 001A34h 11111 11110 11101 00010 00001 00000(1) 00010 Return Address Stack Top-of-Stack 000D58h TOSL TOSH TOSU 34h 1Ah 00h STKPTR<4:0> 000000h Note 1: No RAM associated with this address; always maintained ‘0’s. |
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