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CHAPTER 20 UART2, UART3
Machine clock
SCK2/SCK3
(external
clock
input)
374
Figure 20.6-1 Baud Rate Selection Circuit (Reload Counter)
Reload Value: v
Reception
15-bit Reload Counter
Reload Value: v
0
Transmission
15-bit Reload Counter
1
Count Value: Txc
SMR2/
SMR3
EXT
register
REST
OTO
REST
Rxc = 0?
Reload
Rxc = v/2?
Txc = 0?
Reload
Txc = v/2?
Internal data bus
BGR7
BGR14
BGR6
BGR13
BGR5
BGR12
BGR12/
BGR4
BGR13
BGR11
BGR3
register
BGR10
BGR2
BGR9
BGR1
BGR8
BGR0
Start bit falling
edge detected
set
Reception
FF
0
Clock
reset
1
EXT
set
OTO
FF
0
reset
1
Transmission
Clock
BGR02/
BGR03
register
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