Datasheet

488
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
27.5.9 Transfer Control Register
Name: PERIPH_PTCR
Access: Write-only
• RXTEN: Receiver Transfer Enable
0: No effect.
1: Enables PDC receiver channel requests if RXTDIS is not set.
When a half-duplex peripheral is connected to the PDC, enabling the receiver channel requests automatically disables the trans-
mitter channel requests. It is forbidden to set both TXTEN and RXTEN for a half-duplex peripheral.
• RXTDIS: Receiver Transfer Disable
0: No effect.
1: Disables the PDC receiver channel requests.
When a half-duplex peripheral is connected to the PDC, disabling the receiver channel requests also disables the transmitter
channel requests.
• TXTEN: Transmitter Transfer Enable
0: No effect.
1: Enables the PDC transmitter channel requests.
When a half-duplex peripheral is connected to the PDC, it enables the transmitter channel requests only if RXTEN is not set. It is
forbidden to set both TXTEN and RXTEN for a half-duplex peripheral.
• TXTDIS: Transmitter Transfer Disable
0: No effect.
1: Disables the PDC transmitter channel requests.
When a half-duplex peripheral is connected to the PDC, disabling the transmitter channel requests disables the receiver channel
requests.
31 30 29 28 27 26 25 24
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23 22 21 20 19 18 17 16
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15 14 13 12 11 10 9 8
––––––TXTDISTXTEN
76543210
––––––RXTDISRXTEN