Peripheral Pin Multiplexing (PPM) Module
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
18-23
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field
RESERVED
SHORT_CH[7:0]
SRESET
0000_0000_0000_0000
Addr
0x30 5C28
Figure 18-26. Short Channels Register (SHORT_CH_REG)
Table 18-10. SHORT_CH_REG Bit Descriptions
Bits
Name
Description
0:7
—
Reserved
8:17 SHORT_CH[7:0
]
Each bit of this field will short a specified pair of channels. Where a pair of channels are shorted,
the data for the shorted channel will be transmitted twice.
Refer to
for examples that illustrate the effects of enabling SHORT_CH[7:0] bits.
Table 18-11. Examples of the SHORT_CH Bits
Register Name
Register
Contents
Comments
Example 1
SHORT_CH_REG
0x0000
SHORT_CH[7:0] = 0x00, therefore no shorts enabled
TX_DATA[0:15]
0x1234
0b 0001 0010 0011 0100
Data transmitted
0x1234
Normal transmission.
Example 2
SHORT_CH_REG
0x00F0
SHORT_CH[7:4] = 1, therefore TX_DATA[1, 3, 5, 7]
are enabled for re-transmission.
TX_DATA[0:15]
0x1234
0b 0
0
0
1
0
0
1
0
0011 0100
Underlines show bits to be re-transmitted
Bit
Channel Shorted
Re-transmit (bit time)
SHORT_CH[x] = 0
No short
—
SHORT_CH7 = 1
TX_DATA1 to TX_DATA0
TX_DATA1 in TX_DATA0
SHORT_CH6 = 1
TX_DATA3 to TX_DATA2
TX_DATA3 in TX_DATA2
SHORT_CH5 = 1
TX_DATA5 to TX_DATA4
TX_DATA5 in TX_DATA4
SHORT_CH4 = 1
TX_DATA7 to TX_DATA6
TX_DATA7 in TX_DATA6
SHORT_CH3 = 1
TX_DATA9 to TX_DATA8
TX_DATA9 in TX_DATA8
SHORT_CH2 = 1
TX_DATA11 to TX_DATA10
TX_DATA11 in TX_DATA10
SHORT_CH1 = 1
TX_DATA13 to TX_DATA12
TX_DATA13 in TX_DATA12
SHORT_CH0 = 1
TX_DATA15 to TX_DATA14
TX_DATA15 in TX_DATA14
Summary of Contents for MPC561
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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...
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Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
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Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...