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CHCHK
CHCHK
PLACE CHANNEL IN
LOCAL LOOPBACK
MODE
ENABLE CHANNEL'S
TRANSMITTER CLEAR
CHANNEL
STATUS WORD
TxCHK
IS
TRANSMITTER
READY
?
N
SNDCHR
SEND CHARACTER
TO TRANSMITTER
RxCHK
HAS
RECEIVER
RECEIVED
CHARACTER
?
Y
A
Figure 7-10. Serial Module Programming Flowchart (2 of 5)
7-42
Freescale Semiconductor, Inc.
N
Y
WAITED
TOO LONG
?
N
N
WAITED
TOO LONG
?
MC68340 USER'S MANUAL
For More Information On This Product,
Go to: www.freescale.com
Y
SET TRANSMITTER-
NEVER-READY FLAG
Y
SET RECEIVER-
NEVER-READY FLAG
B
MOTOROLA
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