SH7059 Datasheet, PDF (478/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

15. Serial Communication Interface (SCI)
Start of initialization
1. Select the clock source in the serial control
Clear TE and RE bits to 0 in SCR
register (SCR). Leave RIE, TIE, TEIE,
MPIE, TE, and RE cleared to 0.
2. Select the communication format in the
serial mode register (SMR) and serial
Set CKE1 and CKE0 bits in SCR
direction control register (SDCR).
(RIE, TIE, TEIE, MPIE,TE,
1 _{3. Write the value corresponding to the bit rate}
and RE are 0)
in the bit rate register (BRR) (unless an
external clock is used).
Select transmit/receive
format in SMR and SDCR
4. Wait for at least the interval required to
2
transmit or receive one bit, then set TE or
RE in the serial control register (SCR) to 1.*
Also set RIE, TIE, TEIE, and MPIE. The
Set value in BRR
3
TxD, RxD pins becomes usable in response
to the PFC corresponding bits and the TE,
Wait
RE bit settings.
No
1-bit interval elapsed?
Yes
Set TE and RE to 1 in SCR;
Set RIE, TIE, TEIE, and MPIE bits ⁴
Note: * In simultaneous transmit/receive
operation, the TE bit and RE bit must
be cleared to 0 or set to 1
simultaneously.
End of initialization
Figure 15.17 Sample Flowchart for SCI Initialization
Rev.3.00 Mar. 12, 2008 Page 388 of 948
REJ09B0177-0300