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DVR 数据表(PDF) 209 Page - Microchip Technology |
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DVR 数据表(HTML) 209 Page - Microchip Technology |
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209 / 416 page  2016-2018 Microchip Technology Inc. DS30010118D-page 209 PIC24FJ256GA705 FAMILY REGISTER 17-4: SPIxSTATL: SPIx STATUS REGISTER LOW U-0 U-0 U-0 HS/R/C-0 HSC/R-0 U-0 U-0 HSC/R-0 — — — FRMERR SPIBUSY — — SPITUR(1) bit 15 bit 8 HSC/R-0 HS/R/C-0 HSC/R-1 U-0 HSC/R-1 U-0 HSC/R-0 HSC/R-0 SRMT SPIROV SPIRBE — SPITBE — SPITBF SPIRBF bit 7 bit 0 Legend: C = Clearable bit HS = Hardware Settable bit x = Bit is unknown R = Readable bit W = Writable bit ‘0’ = Bit is cleared HSC = Hardware Settable/Clearable bit -n = Value at POR ‘1’ = Bit is set U = Unimplemented bit, read as ‘0’ bit 15-13 Unimplemented: Read as ‘0’ bit 12 FRMERR: SPIx Frame Error Status bit 1 = Frame error is detected 0 = No frame error is detected bit 11 SPIBUSY: SPIx Activity Status bit 1 = Module is currently busy with some transactions 0 = No ongoing transactions (at time of read) bit 10-9 Unimplemented: Read as ‘0’ bit 8 SPITUR: SPIx Transmit Underrun Status bit(1) 1 = Transmit buffer has encountered a Transmit Underrun condition 0 = Transmit buffer does not have a Transmit Underrun condition bit 7 SRMT: Shift Register Empty Status bit 1 = No current or pending transactions (i.e., neither SPIxTXB or SPIxTXSR contains data to transmit) 0 = Current or pending transactions bit 6 SPIROV: SPIx Receive Overflow Status bit 1 = A new byte/half-word/word has been completely received when the SPIxRXB is full 0 = No overflow bit 5 SPIRBE: SPIx RX Buffer Empty Status bit 1 = RX buffer is empty 0 = RX buffer is not empty Standard Buffer Mode: Automatically set in hardware when SPIxBUF is read from, reading SPIxRXB. Automatically cleared in hardware when SPIx transfers data from SPIxRXSR to SPIxRXB. Enhanced Buffer Mode: Indicates RXELM<5:0> = 6’b000000. bit 4 Unimplemented: Read as ‘0’ bit 3 SPITBE: SPIx Transmit Buffer Empty Status bit 1 = SPIxTXB is empty 0 = SPIxTXB is not empty Standard Buffer Mode: Automatically set in hardware when SPIx transfers data from SPIxTXB to SPIxTXSR. Automatically cleared in hardware when SPIxBUF is written, loading SPIxTXB. Enhanced Buffer Mode: Indicates TXELM<5:0> = 6’b000000. Note 1: SPITUR is cleared when SPIEN = 0. When IGNTUR = 1, SPITUR provides dynamic status of the Transmit Underrun condition, but does not stop RX/TX operation and does not need to be cleared by software. |
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