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MSB
1
2
0
Field
Reset
Addr
Figure 18-18. Receive Data Register (RX_DATA)
18.4.6
Receive Shift Register (RX_SHIFTER)
The RX_SHIFTER register receives data serially from the PPM input signals
PPM_RX[0:1] (depending on the value of PPMPCR[OP_16_8]). Data bits are shifted in on
every TCLK cycle. Data in the RX_SHIFTER register is delivered directly to the MPC533
internal modules with no wait time.
MSB
1
2
0
Field
Reset
Addr
Figure 18-19. Receive Shifter Register (RX_SHIFTER)
18.4.7
Transmit Data Register (TX_DATA)
The TX_DATA register contains data from the internally multiplexed modules that is to be
transmitted from the PPM module on the PPM_TX[1:0] signals (depending on the value in
PPMPCR[OP_16_8]). Data bits are transmitted serially (shifted out) on each TCLK cycle.
The data is shifted out least significant bit (LSB) first, therefore TX_DATA[15] first,
TX_DATA[0] last.
MSB
1
2
0
Field
Reset
Addr
Figure 18-20. Transmit Data Register (TX_DATA)
18.4.8
General-Purpose Data Out (GPDO)
The GPDO register is an internal register whose data can be transmitted serially through the
PPM. By default, the transmit configuration registers are set to transmit from this register.
The value in GPDO[0:15] is written into TX_DATA[0:15].
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
3
4
5
6
0000_0000_0000_0000
3
4
5
6
0000_0000_0000_0000
3
4
5
6
0000_0000_0000_0000
Chapter 18. Peripheral Pin Multiplexing (PPM) Module
7
8
9
10
RX_DATA
0x30 5C16
7
8
9
10
RX_SHIFTER
0x30 5C1A
7
8
9
10
TX_DATA
0x30 5C1E
PPM Registers
11
12
13
14
LSB
11
12
13
14
LSB
11
12
13
14
LSB
18-17
15
15
15
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