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Enhanced Serial Communications Interface (ESCI) Module
MC68HC908GT16 MC68HC908GT8 Data Sheet, Rev. 3
172
Freescale Semiconductor
Use the following formula to calculate the ESCI baud rate:
where:
f
Bus
BPD = Baud rate register prescaler divisor
BD
= Baud rate divisor
PD
= Prescaler divisor
PDFA = Prescaler divisor fine adjust
= Bus frequency
Table 14-11
shows the ESCI baud rates that can be generated with a 4.9152-MHz bus frequency.
0 1 1 1 1
15/32 = 0.46875
1 0 0 0 0
16/32 = 0.5
1 0 0 0 1
17/32 = 0.53125
1 0 0 1 0
18/32 = 0.5625
1 0 0 1 1
19/32 = 0.59375
1 0 1 0 0
20/32 = 0.625
1 0 1 0 1
21/32 = 0.65625
1 0 1 1 0
22/32 = 0.6875
1 0 1 1 1
23/32 = 0.71875
1 1 0 0 0
24/32 = 0.75
1 1 0 0 1
25/32 = 0.78125
1 1 0 1 0
26/32 = 0.8125
1 1 0 1 1
27/32 = 0.84375
1 1 1 0 0
28/32 = 0.875
1 1 1 0 1
29/32 = 0.90625
1 1 1 1 0
30/32 = 0.9375
1 1 1 1 1
31/32 = 0.96875
Table 14-10. ESCI Prescaler Divisor Fine Adjust (Continued)
PSSB[4:3:2:1:0]
Prescaler Divisor Fine Adjust (PDFA)
Baud rate
fBus
BD
64
BPD
PD
PDFA
+
(
)
×
×
×
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