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Figure 13.4 shows a sample flowchart for initializing the SCI.
Start of initialization
Clear TE and RE bits
to 0 in SCR
Set CKE1 and CKE0 bits in SCR
(leaving TE and RE bits
cleared to 0)
Select communication format
in SMR
Set value in BRR
1-bit interval elapsed?
Set TE or RE bit to 1 in SCR
Set the RIE, TIE, TEIE, and
MPIE bits
<End of initialization>
Note: In simultaneous transmitting and receiving, the TE and RE bits should be cleared to
0 or set to 1 simultaneously.
Figure 13.4 Sample Flowchart for SCI Initialization
(1)
(2)
(3)
Wait
No
Yes
(4)
Section 13 Serial Communication Interface
(1)
Set the clock source in SCR. Clear the
RIE, TIE, TEIE, MPIE, TE, and RE bits to
0.
If
clock
asynchronous mode, clock output starts
immediately after the setting is made in
SCR.
(2)
Select the communication format in SMR.
(3)
Write the value corresponding to the bit
rate in BRR.
This step is not necessary when an
external clock is used.
(4)
Wait for at least the interval required to
transmit or receive one bit, then set the
TE or RE bit to 1 in SCR. Set the RIE,
TIE, TEIE, and MPIE bits as necessary.
Setting the TE or RE bit enables the SCI
to use the TxD or RxD pin.
Rev. 4.00 Jan 26, 2006 page 513 of 938
output
is
selected
REJ09B0276-0400
in
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