MC68HC08AS32 Datasheet, PDF (180/280 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

SCR2–SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate divisor as shown in Table 12-7.
Reset clears SCR2:SCR0.
Table 12-7. SCI Baud Rate Selection
SCR2:SCR1:SCR0
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 = ----C----G-----M-----X----C----L----K------
64 × PD × BD
PD = Prescale divisor (see Table 12-6)
BD = Baud rate divisor (see Table 12-7)
Table 12-8 shows the SCI baud rates that can be generated with a 4.194-MHz
crystal.
Data Sheet
180
MC68HC08AS32 — Rev. 4.1
Freescale Semiconductor