MA8251
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
S2 S1 EP PEN L2 L1 B2 B1
BAUD RATE FACTOR
0
0
SYNC
MODE
0
0
(1x)
1
1
(16x)
1
1
(64x)
CHARACTER LENGTH
0
0
5
BITS
1
0
6
BITS
0
1
7
BITS
1
1
8
BITS
PARITY ENABLE AND SENSE
1 = ENABLE 0 = DISABLE
1 = EVEN 0 = ODD
NUMBER OF STOP BITS
0
0
NOT
VALID
1
0
1
BIT
0
1
1 1/2
BITS
1
1
2
BITS
Figure 4: Mode Instruction Format, Asynchronous Mode
DATA BITS D0-Dx
TxD
MARKING
GENERATED BY MA8251
PARITY BIT
STOP
BITS
DATA BITS D0-Dx
RxD
DOES NOT APPEAR ON DBUS
PARITY BIT
STOP
BITS
PROGRAMMED CHAR. LENGTH
Figure 5: Asynchronous Mode
6