XR68C681J-F Datasheet, PDF (29/75 Pages) Exar Corporation – CMOS Dual Channel UART(DUART)

XR68C681
D.4 External Inputs
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D.5 Clock Select Registers, CSRA and CSRB
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Bit 7
Bit 6
Bit 5
'(
'3 '
 Table 9
Bit 4
Bit 3
Bit 2
Bit 1
 %(
'3 '
  
Bit 0
Table 8. Bit Format of the Clock Select Registers, CSRA and CSRB
Field
CSR[7:4]
CSR[3:0]
































































Bit Rate
ACR[7] = 0 (Bit Rate Set #1)
ACR[7] = 1 (Bit Rate Set #2)
X=0
X=1
X=0
X=1
6
@6
@6
6




1=6
1=6
1=6
1=6

6
6

1
1/
1
1/
/
==7
/
==7

<<7

<<7
6
6@/7

6@/7
=
67
=
67
=<
=<
=<
=<
@
<
<
@
/
/
/
/
1<=7
7
7
1<=7
(
(
(
(
2!   /5
2!   /5
2!   /5
2!   /5
2!   5
2!   5
2!   5
2!   5
Table 9. Bit Format of the Clock Select Registers CSR[3:0] and CSR[7:4]