MC68340AB16E Datasheet, PDF (337/441 Pages) Motorola, Inc – Integrated Processor with DMA User’s Manual

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