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MC68HC08AZ32A Datasheet, PDF (224/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit
Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
SCR2 – SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate divisor as shown in
Table 15-10. Reset clears SCR2–SCR0.
Table 15-10. SCI Baud Rate Selection
SCR[2:1:0]
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--CP---r--yD--s--t-a-×--l--B-----D---
where:
fCrystal = crystal frequency
PD = prescaler divisor
BD = baud rate divisor
Table 15-11 shows the SCI baud rates that can be generated with a
4.9152-MHz crystal.
Technical Data
224
MC68HC08AZ32A — Rev 1.0
Serial Communications Interface (SCI)
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