Specifications

SCI Port Interrupts
8-18
8.5.1 SCI Baud Rate Calculation
The internally generated serial clock is determined by the device clock fre-
quency (CLKOUT) and the baud rate select registers. The SCI uses the 16-bit
value of the baud select registers to select one of the 64K different serial clock
rates possible for a given device clock.
See the bit descriptions in section 8.6.3, Baud-Select Registers , for the formu-
la to use to calculate the SCI Asynchronous Baud.
Table 8–3. Asynchronous Baud Register Values for Common SCI Bit Rates
Device Clock Frequency, 30 MHz
Ideal Baud
BRR
Actual Baud % Error
2400 1562 2399 –0.03
4800 780 4802 0.03
8192 457 8188 –0.05
9600 390 9591 – 0.10
19200 194 19230 0.16
38400
97 38265 –0.35
Note: The maximum CLKOUT frequency for ’240x devices is 30 MHz.