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DSPIC33EP64GS708 数据表(PDF) 28 Page - Microchip Technology |
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DSPIC33EP64GS708 数据表(HTML) 28 Page - Microchip Technology |
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28 / 484 page  dsPIC33EPXXXGS70X/80X FAMILY DS70005258C-page 28 2016-2018 Microchip Technology Inc. 3.7 CPU Control Registers REGISTER 3-1: SR: CPU STATUS REGISTER R/W-0 R/W-0 R/W-0 R/W-0 R/C-0 R/C-0 R-0 R/W-0 OA OB SA(3) SB(3) OAB SAB DA DC bit 15 bit 8 R/W-0(2) R/W-0(2) R/W-0(2) R-0 R/W-0 R/W-0 R/W-0 R/W-0 IPL2(1) IPL1(1) IPL0(1) RA N OV Z C bit 7 bit 0 Legend: C = Clearable bit R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’= Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15 OA: Accumulator A Overflow Status bit 1 = Accumulator A has overflowed 0 = Accumulator A has not overflowed bit 14 OB: Accumulator B Overflow Status bit 1 = Accumulator B has overflowed 0 = Accumulator B has not overflowed bit 13 SA: Accumulator A Saturation ‘Sticky’ Status bit(3) 1 = Accumulator A is saturated or has been saturated at some time 0 = Accumulator A is not saturated bit 12 SB: Accumulator B Saturation ‘Sticky’ Status bit(3) 1 = Accumulator B is saturated or has been saturated at some time 0 = Accumulator B is not saturated bit 11 OAB: OA || OB Combined Accumulator Overflow Status bit 1 = Accumulator A or B has overflowed 0 = Neither Accumulator A or B has overflowed bit 10 SAB: SA || SB Combined Accumulator ‘Sticky’ Status bit 1 = Accumulator A or B is saturated or has been saturated at some time 0 = Neither Accumulator A or B is saturated bit 9 DA: DO Loop Active bit 1 = DO loop is in progress 0 = DO loop is not in progress bit 8 DC: MCU ALU Half Carry/Borrow bit 1 = A carry-out from the 4th low-order bit (for byte-sized data) or 8th low-order bit (for word-sized data) of the result occurred 0 = No carry-out from the 4th low-order bit (for byte-sized data) or 8th low-order bit (for word-sized data) of the result occurred Note 1: The IPL<2:0> bits are concatenated with the IPL<3> bit (CORCON<3>) to form the CPU Interrupt Priority Level. The value in parentheses indicates the IPL, if IPL<3> = 1. User interrupts are disabled when IPL<3> = 1. 2: The IPL<2:0> Status bits are read-only when the NSTDIS bit (INTCON1<15>) = 1. 3: A data write to the SR register can modify the SA and SB bits by either a data write to SA and SB or by clearing the SAB bit. To avoid a possible SA or SB bit write race condition, the SA and SB bits should not be modified using bit operations. |
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