Peripheral Pin Multiplexing (PPM) Module
MPC561/MPC563 Reference Manual, Rev. 1.2
18-22
Freescale Semiconductor
Figure 18-25. Short Between TPU Channels
18.4.11
Short Channels Register (SHORT_CH_REG)
SHORT_CH_REG allows the shorting of transmit channels from the PPM using the bit field SHORT[7:0].
The PPM normally transmits data by right-shifting TX_DATA at the rate of one bit per PPM_TCLK cycle,
TX_DATA15 first. Shorts can be enabled for transmit data bits TX_DATA[1, 3, 5, 7, 9, 11, 13, and 15].
Where a short is enabled for any of these transmit data bits, that bit will be transmitted for two PPM_TCLK
cycles, during its own bit time and the bit time of the following transmit data bit.
EXAMPLE
If SHORT_CH
x
= 1, transmit TX_DATA
x
during TX_DATA
x
bit time and
repeat TX_DATA
x
during TX_DATA[
x
-1] bit time.
SH_TPU1
A_TPUCH1
B_TPUCH1
Effect on TPU3 Modules
1
Input
Input
Data on pad A_TPUCH1 will be the input to A_TPUCH1 and
B_TPUCH1
1
Input
Output
Output data on B_TPUCH1 will be the input to A_TPUCH1
1
Output
Input
Output on A_TPUCH1 will be the input data to B_TPUCH1
1
Output
Output
No Short
0
X
X
No Short
Table 18-9. SHORT_REG[SH_TPU] Bit Settings
Pad
Pad
A_CH
B_CH
A_TPUCH
B_TPUCH
TPU_A
TPU_B
MPC561/MPC563
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...