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Figure 10.7 shows a typical flow chart for SCI3 initialization.
Clear TE and RE to 0 in SCR3
1
Set bits CKE1 and CKE0
2
Select communication format in SMR
3
Set BRR value
Has a 1-bit
interval elapsed?
Set bits RIE, TIE, TEIE, and MPIE
4
in SCR3, and set TE or RE to 1
Figure 10.7 Typical Flow Chart when SCI3 Is Initialized
Start
Wait
Yes
End
1.
Select the clock using serial control
register 3(SCR3). Be sure to set 0 for other
unused bits.
When the clock output is selected in the
asynchronous mode, a clock signal is
output immediately after setting bits CKE1
and CKE0 appropriately.
2.
Set the transmit/receive format in the serial
mode register (SMR).
3.
Write the value corresponding to the desired
bit rate to the bit rate register (BRR). Note that
this setting is not required when using an
external clock.
4.
Wait for at least a 1-bit interval, then set
bits RIE, TIE, TEIE, and MPIE, and set bit
TE or RE in SCR3 to 1. Setting TE or RE
No
enables SCI3 to use the TXD or RXD pin.
The initial states in asynchronous mode
are the mark transmit state and the idle
receive state (waiting for a start bit).
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