Manual

343
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
27.4.3 Transmit Pointer Register
Register Name: PERIPH_TPR
Access Type: Read/Write
• TXPTR: Transmit Counter Register
TXPTR must be set to transmit buffer address.
When a half duplex peripheral is connected to the PDC, RXPTR = TXPTR.
27.4.4 Transmit Counter Register
Register Name: PERIPH_TCR
Access Type: Read/Write
• TXCTR: Transmit Counter Register
TXCTR must be set to transmit buffer size.
When a half duplex peripheral is connected to the PDC, RXCTR = TXCTR.
0 = Stops peripheral data transfer to the transmitter
1- 65535 = Starts peripheral data transfer if corresponding channel is active
31 30 29 28 27 26 25 24
TXPTR
23 22 21 20 19 18 17 16
TXPTR
15 14 13 12 11 10 9 8
TXPTR
76543210
TXPTR
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
TXCTR
76543210
TXCTR