Typewriter User Manual

MOTOROLA MC68340 USER’S MANUAL 7- 41
SERIAL MODULE
INITIATE:
CHANNEL A
C
HANNEL B
I
NTERRUPTS
POINT TO CHANNEL A
SAVE CHANNEL A
STATUS
POINT TO CHANNEL B
SAVE CHANNEL B
STATUS
ANY
ERRORS IN
CHANNEL A
?
ENABLE CHANNEL
A'S RECEIVER
ASSERT CHANNEL A
REQUEST TO SEND
ANY
ERRORS IN
CHANNEL B
?
ENABLE CHANNEL
B'S TRANSMITTER
RETURN
SINIT
CHK1
CHK2
ENABLA
Y
N
ENABLB
SINITR
CALL CHCHK
CALL CHCHK
Y
N
Figure 7-10. Serial Module Programming Flowchart (1 of 5)
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cale Semiconductor,
I
Freescale Semiconductor, Inc.
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