Usart receive counter register, Usart transmit pointer register – Rainbow Electronics AT75C220 User Manual
Page 95
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AT75C220
95
USART Receive Counter Register
Name:
US_RCR
Access Type:Read/write
Reset Value: 0x0
•
RXCTR: Receive Counter
RXCTR must be loaded with the size of the receive buffer.
0: Stop peripheral data transfer dedicated to the receiver.
1 - 65535: Start peripheral data transfer if RXRDY is active.
USART Transmit Pointer Register
Name:
US_TPR
Access Type:Read/write
Reset Value: 0x0
•
TXPTR: Transmit Pointer
TXPTR must be loaded with the address of the transmit buffer.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
RXCTR
7
6
5
4
3
2
1
0
RXCTR
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
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