Operation

 

 

 

 

 

CHCHK

 

 

 

 

CHCHK

 

 

 

 

 

PLACE CHANNEL IN

 

 

 

 

LOCAL LOOPBACK

 

 

 

 

MODE

 

 

 

 

ENABLE

 

 

 

 

TRANSMITTER CLEAR

 

 

 

 

STATUS WORD

 

 

 

 

TxCHK

 

 

N

 

 

 

 

 

 

 

IS

 

N

WAITED

Y

SET TRANSMITTER-

TRANSMITTER

 

TOO LONG

 

NEVER-READY FLAG

READY

 

 

 

 

 

?

 

 

?

 

 

 

 

Y

 

 

 

 

SNDCHR

 

 

 

 

SEND CHARACTER

 

 

 

 

TO TRANSMITTER

 

 

 

 

RxCHK

 

 

N

 

 

 

 

 

 

 

HAS

 

N

WAITED

Y

SET RECEIVER-

CHARACTER BEEN

 

TOO LONG

 

NEVER-READY FLAG

RECEIVED

 

?

 

 

?

Y

 

 

 

 

 

 

 

 

 

A

 

 

 

 

B

Figure 23-26. UART Mode Programming Flowchart (Sheet 2 of 5)

23-32

MCF5282 User’s Manual

MOTOROLA

Page 506
Image 506
Motorola MCF5282, MCF5281 user manual Uart Mode Programming Flowchart Sheet 2