3 transmit pointer register, 4 transmit counter register – Rainbow Electronics AT91CAP9S250A User Manual
Page 343
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
7
6
5
4
3
2
1
0
TXPTR
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
TXCTR
7
6
5
4
3
2
1
0
TXCTR