MC68HC908GT16_07 Datasheet, PDF (174/292 Pages) Freescale Semiconductor, Inc – Microcontrollers

Enhanced Serial Communications Interface (ESCI) Module
Table 14-10. ESCI Prescaler Divisor Fine Adjust (Continued)
PSSB[4:3:2:1:0]
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
Prescaler Divisor Fine Adjust (PDFA)
15/32 = 0.46875
16/32 = 0.5
17/32 = 0.53125
18/32 = 0.5625
19/32 = 0.59375
20/32 = 0.625
21/32 = 0.65625
22/32 = 0.6875
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----fD--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 14-11 shows the ESCI baud rates that can be generated with a 4.9152-MHz bus frequency.
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
174
Freescale Semiconductor