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