NXP Semiconductors MPC5605BK, Reference Manual

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Chapter 26 Deserial Serial Peripheral Interface (DSPI)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 617
26.5.9 DSPI Transmit FIFO Registers 0–3 (DSPI x _TXFR n )
The DSPI x _TXFR n registers provide visibility into the TX FIFO for debugging purposes. Each register is
an entry in the TX FIFO. The registers are read-only and cannot be modified. Reading the DSPI x _TXFR n
registers does not alter the state of the TX FIFO. The MCU uses four registers to implement the TX FIFO,
that is DSPI
x _TXFR0–DSPI x _TXFR3 are used.
26.5.9.1 DSPI Receive FIFO Registers 0–3 (DSPI x _RXFR n )
The DSPI x _RXFR n registers provide visibility into the RX FIFO for debugging purposes. Each register is
an entry in the RX FIFO. The DSPI x _RXFR registers are read-only. Reading the DSPI x _RXFR n registers
does not alter the state of the RX FIFO. The device uses four registers to implement the RX FIFO, that is
DSPI
x _RXFR0–DSPI x _RXFR3 are used.
Offsets: 0x3C–0x48 (4 registers) Access: Read
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R TXCMD
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 TXDATA
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 26-10. DSPI Transmit FIFO Register 0–3 (DSPI x _TXFR n )
Table 26-22. DSPI x _TXFR n field descriptions
Field Description
TXCMD Transmit command
Contains the command that sets the transfer attributes for the SPI data. See
Section 26.5.7, DSPI PUSH
TX FIFO Register (DSPIx_PUSHR) , for details on the command field.
TXDATA Transmit data
Contains the SPI data to be shifted out.