7 transmit next pointer register, 8 transmit next counter register – Rainbow Electronics AT91CAP9S250A User Manual
Page 345
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345
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
27.4.7
Transmit Next Pointer Register
Register Name:
PERIPH_TNPR
Access Type:
Read/Write
• TXNPTR: Transmit Next Pointer
TXNPTR contains next transmit buffer address.
When a half duplex peripheral is connected to the PDC, RXNPTR = TXNPTR.
27.4.8
Transmit Next Counter Register
Register Name:
PERIPH_TNCR
Access Type:
Read/Write
• TXNCTR: Transmit Counter Next
TXNCTR contains next transmit buffer size.
When a half duplex peripheral is connected to the PDC, RXNCTR = TXNCTR.
31
30
29
28
27
26
25
24
TXNPTR
23
22
21
20
19
18
17
16
TXNPTR
15
14
13
12
11
10
9
8
TXNPTR
7
6
5
4
3
2
1
0
TXNPTR
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
TXNCTR
7
6
5
4
3
2
1
0
TXNCTR
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