w65c51n Western Design Center, Inc., w65c51n Datasheet - Page 8

• Manufacturer Part Number: w65c51n
• Description: Asynchronous Communications Interface Adapter Acia
• Manufacturer: Western Design Center, Inc.

CONTROL REGISTER
The Control Register selects the desired baud rate, frequency source, word length and the number of
stop bits.
Reset Initialization
Bit 7
Bit 4
Bit 3-0
7
0
-
Bits 6-5
SB
3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
N
7
6
0
0
1
1
6
0
-
0
1
WL1
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
1
1
1
5
0
-
5
0
1
0
1
6
4
0
-
WL
Selected Baud Rate
(SBR)
WL0
Word Length (WL)
No. Bits
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
3
0
-
Receiver Clock Source
(RCS)
External receiver clock
Baud rate
8
7
6
5
5
Stop Bit Number (SBN)
1 Stop bit
2 Stop bits
1 ½ Stop bits
For WL = 5 and no parity
1 Stop bit
For WL = 8 and parity
2
0
-
RCS
1
0
-
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
4
0
0
-
Baud
16x
50
75
109.92
134.58
150
300
600
1200
1800
2400
3600
4800
7200
9600
19,200
SBR
Hardware reset (RESB)
Program reset
3
3
SBR
2
2
SBR
SBR
1
1
SBR
0
0
8