MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
20-25
20.3.2.7
DSPI POP RX FIFO Register (DSPIx_POPR)
The DSPI
x
_POPR provides a means to read the RX FIFO. See
Section 20.4.3.5, “Receive First In First
Out (RX FIFO) Buffering Mechanism
” for a description of the RX FIFO operations. Eight or sixteen bit
read accesses to the DSPI
x
_POPR will read from the RX FIFO and update the counter and pointer.
NOTE
The DSPI
x
_POPR must not be read speculatively. For future compatibility,
the TLB entry covering the DSPI
x
_POPR must be configured to be guarded.
10–15
PCSn
Peripheral chip select n. Selects which PCS signals will be asserted for the transfer.
0 Negate the PCSn signal
1 Assert the PCSn signal
Note: This bitfield is only used in SPI master mode
16–31
TXDATA
[0:15]
Transmit data. Holds SPI data to be transferred according to the associated SPI
command.
Note: TXDATA is used in master and slave modes.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0038
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
RXDATA
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0038
Figure 20-9. DSPI POP RX FIFO Register (DSPIx_POPR)
Table 20-9. DSPIx_POPR Field Descriptions
Bits
Name
Description
0–15
—
Reserved, should be cleared.
16–31
RXDATA
[0:15]
Received data. The RXDATA field contains the SPI data from the RX FIFO entry
pointed to by the pop next data pointer (POPNXTPTR).
Table 20-8. DSPIx_PUSHR Field Descriptions
Bits
Name
Description
Summary of Contents for MPC5553
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