Deserial Serial Peripheral Interface (DSPI)
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor
307
describes the field in the DSPI receive FIFO register.
11.8
Functional description
The DSPI supports full-duplex, synchronous serial communications between the MCU and peripheral
devices. All communications are through an SPI-like protocol.
The DSPI has one configuration:
•
Serial peripheral interface (SPI) configuration in which the DSPI operates as a basic SPI or a
queued SPI
The DCONF field in the DSPI
x
_MCR register determines the DSPI configuration. Refer to
the DSPI configuration values.
The DSPI
x
_CTAR0–DSPI
x
_CTAR7 registers hold clock and transfer attributes.The SPI configuration can
select which CTAR to use on a frame-by-frame basis by setting the CTAS field in the DSPI
x
_PUSHR.
The 16-bit shift register in the master and the 16-bit shift register in the slave are linked by the SOUT_
x
and SIN_
x
signals to form a distributed 32-bit register. When a data transfer operation is performed, data
is serially shifted a predetermined number of bit positions. Because the registers are linked, data is
exchanged between the master and the slave; the data that was in the master’s shift register is now in the
Address:
Base + 0x007C (DSPIx_RXFR0)
Base + 0x0080 (DSPIx_RXFR1)
Base + 0x0084 (DSPIx_RXFR2)
Base + 0x0088 (DSPIx_RXFR3)
Base + 0x008C (DSPIx_RXFR4)
Access: R/O
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
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
Figure 11-10. DSPI Receive FIFO Registers 0–4 (DSPIx_RXFRn)
Table 11-17. DSPIx_RXFRn field descriptions
Field
Description
0–15
Reserved, must be cleared.
16–31
RXDATA
[15:0]
Receive data. Contains the received SPI data.
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