MC68HC908GT16 Datasheet, PDF (288/412 Pages) Motorola, Inc – Microcontrollers

Enhanced Serial Communications Interface (ESCI)
Table 18-10. ESCI Prescaler Divisor Fine Adjust (Continued)
PSSB[4:3:2:1:0]
1 0 111
11 0 0 0
11 0 0 1
11 0 1 0
11 0 11
111 0 0
111 0 1
1111 0
11111
Prescaler Divisor Fine Adjust (PDFA)
23/32 = 0.71875
24/32 = 0.75
25/32 = 0.78125
26/32 = 0.8125
27/32 = 0.84375
28/32 = 0.875
29/32 = 0.90625
30/32 = 0.9375
31/32 = 0.96875
Use the following formula to calculate the ESCI baud rate:
Baud rate = _{6----4-----×}----B-----P----D------_×-----B---f-D-B----u-_×---s--₍--P-----D-----+-----P-----D----F-----A---₎-
where:
f_Bus = Bus frequency
BPD = Baud rate register prescaler divisor
BD = Baud rate divisor
PD = Prescaler divisor
PDFA = Prescaler divisor fine adjust
Table 18-11 shows the ESCI baud rates that can be generated with a
4.9152-MHz bus frequency.
Technical Data
288
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
Enhanced Serial Communications Interface (ESCI) Module
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