
18-16
MPC561/MPC563 Reference Manual
MOTOROLA
PPM Registers
TX_CONFIG_1 and TX_CONFIG_2 can only be written while PPM transmit mode is
disabled (PPMPCR[ENTX] = 0). While transmit is enabled these registers read as 0x00 and
writing them will return TEA (bus error access).
18.4.4
Receive Configuration Registers (RX_CONFIG_1 and
RX_CONFIG_2)
The two receive configuration registers control which internal modules will receive data
from the PPM. Each of the configuration registers contains eight separate 2-bit wide bit
fields. Each of the 16 fields controls a multiplexer that selects a 1-bit channel from the PPM
data receive register to an internal module. See
Table 18-6 for more information on channel
control and setting the channel values.
RX_CONFIG_1 and RX_CONFIG_2 can only be written while PPM receive mode is
disabled (PPMPCR[ENRX] = 0). While receive mode is enabled these registers read as
0x00 and writing them will return TEA (bus error access).
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
SRESET
0000_0000_0000_0000
Addr
0x30 5C06
Figure 18-14. Transmit Configuration Register 1 (TX_CONFIG_1)
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field
CH15
CH14
CH13
CH12
CH11
CH10
CH9
CH8
SRESET
0000_0000_0000_0000
Addr
0x30 5C08
Figure 18-15. Transmit Configuration Register 2 (TX_CONFIG_2)
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
SRESET
0000_0000_0000_0000
Addr
0x30 5C0E
Figure 18-16. Receive Configuration Register 1 (RX_CONFIG_1)