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CHCHK
CHCHK
PLACE CHANNEL IN
LOCAL LOOPBACK
MODE
ENABLE
TRANSMITTER CLEAR
STATUS WORD
TxCHK
IS
N
TRANSMITTER
Y
READY
?
Y
N
SNDCHR
SEND CHARACTER
TO TRANSMITTER
RxCHK
HAS
N
CHARACTER BEEN
RECEIVED
?
Y
A
Figure 16-31. UART Mode Programming Flowchart (Sheet 2 of 5)
N
WAITED
Y
TOO LONG
?
N
WAITED
Y
TOO LONG
?
Chapter 16. UART Modules
SET TRANSMITTER-
NEVER-READY FLAG
SET RECEIVER-
NEVER-READY FLAG
Operation
B
16-33
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