FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 211)

197
CHAPTER 10 UART
Figure 10.1-2 Sample calculation of the baud rate (external clock is selected)
Table 10.1-5 Transfer cycle and transfer rate by external clocks
Asynchronous transfer mode Synchronous transfer mode
Selected baud
rate division
value
Transfer
cycle
Transfer rate
(baud)
(*1)
Selected baud
rate division
value
Transfer
cycle
Transfer rate
(baud)
(*1)
CR = 0 16
128/F
CH
or
more
39062 or less
1 8/F
CH
or more 625k or less
CR = 1 64
512/F
CH
or
more
9765 or less
F
CH
: Main clock oscillation frequency
*1: Min. external clock cycle of (8/F
CH
= 0.16
µs) for F
CH
set at 5 MHz.
Baud rate value =
External clock input (F CH /2/4 min.)
CR=0...16
CR=1...64 ( )
CR
F CH : Main clock oscillation frequency