mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 201

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908BD48
Freescale Semiconductor
—
Rev. 2.1
BR2–BR0 — Baud Rate Select
These three bits select one of eight clock rates as the master clock
when the module is in master mode.
Since this master clock is derived the CPU bus clock, the user
program should not execute the WAIT instruction when the DDC
module in master mode. This will cause the SDA and SCL lines to
hang, as the WAIT instruction places the MCU in WAIT mode, with
CPU clock is halted. These bits are cleared upon reset. (See
15-3 . Baud Rate
NOTE:
CPU bus clock is external clock ÷ 4 = 6MHz
BR2
0
0
0
0
1
1
1
1
DDC12AB Interface
Table 15-3. Baud Rate Select
Select.)
BR1
0
0
1
1
0
0
1
1
BR0
0
1
0
1
0
1
0
1
Baud Rate
3.125k
12.5k
6.25k
1.56k
0.78k
100k
50k
25k
DDC12AB Interface
Data Sheet
Table
201