MC68HC08AZ0 Datasheet, PDF (216/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Serial Communications Interface Module (SCI)
Table 8. SCI baud rate prescaling
SCP1:0
00
01
10
11
Prescaler Divisor (PD)
1
3
4
13
SCR2–SCR0 — SCI baud rate select bits
These read/write bits select the SCI baud rate divisor as shown in
Table 9. Reset clears SCR2–SCR0.
Table 9. SCI baud rate selection
SCR2:1:0
000
001
010
011
100
101
110
111
Baud Rate Divisor (BD)
1
2
4
8
16
32
64
128
Use the following formula to calculate the SCI baud rate:
Baud rate = -6---4----_×--f--^X-P---^C-D---^L--_×-^K----B-----D--
where:
f_XCLK = clock frequency
PD = prescaler divisor
BD = baud rate divisor
Table 10 shows the SCI baud rates that can be generated with a
4.9152-MHz crystal.
MC68HC08AZ0
214
Serial Communications Interface Module (SCI)
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