MA8251
D7 D6 D5 D4 D3 D2 D1 D0
S2 S1 EP PEN L2 L1 B2 B1
BAUD RATE FACTOR
0
0
0
0
1
1
1
1
SYNC
MODE
(1x)
(16x)
(64x)
CHARACTER LENGTH
0
0
1
0
0
1
1
1
5
6
7
8
BITS
BITS
BITS
BITS
PARITY ENABLE AND SENSE
1 = ENABLE 0 = DISABLE
1 = EVEN 0 = ODD
NUMBER OF STOP BITS
0
0
1
0
0
1
1
1
NOT
1
1 1/2
BITS
2
VALID
BIT
BITS
Figure 4: Mode Instruction Format, Asynchronous Mode
DATA BITS D0-Dx
DATA BITS D0-Dx
GENERATED BY MA8251
PARITY BIT
TxD MARKING
STOP
BITS
DOES NOT APPEAR ON DBUS
RxD
PROGRAMMED CHAR. LENGTH
PARITY BIT
STOP
BITS
Figure 5: Asynchronous Mode
6
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
