Datasheet

PIC32MX5XX/6XX/7XX
DS60001156H-page 214  2009-2013 Microchip Technology Inc.
REGISTER 17-2: SPIxSTAT: SPI STATUS REGISTER
Bit
Range
Bit
31/23/15/7
Bit
30/22/14/6
Bit
29/21/13/5
Bit
28/20/12/4
Bit
27/19/11/3
Bit
26/18/10/2
Bit
25/17/9/1
Bit
24/16/8/0
31:24
U-0 U-0 U-0 R-0 R-0 R-0 R-0 R-0
— — — RXBUFELM<4:0>
23:16
U-0 U-0 U-0 R-0 R-0 R-0 R-0 R-0
— — — TXBUFELM<4:0>
15:8
U-0 U-0 U-0 U-0 R-0 U-0 U-0 R-0
— — — — SPIBUSY — —SPITUR
7:0
R-0 R/W-0 R-0 U-0 R-1 U-0 R-0 R-0
SRMT SPIROV SPIRBE —SPITBE— SPITBF SPIRBF
Legend: C = Clearable bit HS = Set in hardware
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 31-29 Unimplemented: Read as ‘0’
bit 28-24 RXBUFELM<4:0>: Receive Buffer Element Count bits (only valid when ENHBUF = 1)
bit 23-21 Unimplemented: Read as ‘0’
bit 20-16 TXBUFELM<4:0>: Transmit Buffer Element Count bits (only valid when ENHBUF = 1)
bit 15-12 Unimplemented: Read as ‘0’
bit 11 SPIBUSY: SPI Activity Status bit
1 = SPI peripheral is currently busy with some transactions
0 = SPI peripheral is currently idle
bit 10-9 Unimplemented: Read as ‘0’
bit 8 SPITUR: Transmit Under Run bit
1 = Transmit buffer has encountered an underrun condition
0 = Transmit buffer has no underrun condition
This bit is only valid in Framed Sync mode; the underrun condition must be cleared by disabling/re-enabling
the module.
bit 7 SRMT: Shift Register Empty bit (only valid when ENHBUF = 1)
1 = When SPI module shift register is empty
0 = When SPI module shift register is not empty
bit 6 SPIROV: Receive Overflow Flag bit
1 = A new data is completely received and discarded. The user software has not read the previous data in
the SPIxBUF register.
0 = No overflow has occurred
This bit is set in hardware; can only be cleared (= 0) in software.
bit 5 SPIRBE: RX FIFO Empty bit (only valid when ENHBUF = 1)
1 = RX FIFO is empty (CRPTR = SWPTR)
0 = RX FIFO is not empty (CRPTR
SWPTR)
bit 4 Unimplemented: Read as ‘0’
bit 3 SPITBE: SPI Transmit Buffer Empty Status bit
1 = Transmit buffer, SPIxTXB is empty
0 = Transmit buffer, SPIxTXB is not empty
Automatically set in hardware when SPI transfers data from SPIxTXB to SPIxSR.
Automatically cleared in hardware when SPIxBUF is written to, loading SPIxTXB.
bit 2 Unimplemented: Read as ‘0’