D12320VF25IV Datasheet, PDF(694/1304 Page) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

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D12320VF25IV Datasheet, PDF (694/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

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Section 14 Serial Communication Interface (SCI)

Operation in Case of Mode Transition

â¢ Transmission

Operation should be stopped (by clearing TE, TIE, and TEIE to 0) before making a module

stop mode or software standby mode transition. TSR, TDR, and SSR are reset. The output pin

states in module stop mode or software standby mode depend on the port settings, and

becomes high-level output after the relevant mode is cleared. If a transition is made during

transmission, the data being transmitted will be undefined. When transmitting without

changing the transmit mode after the relevant mode is cleared, transmission can be started by

setting TE to 1 again, and performing the following sequence: SSR read â TDR write â

TDRE clearance. To transmit with a different transmit mode after clearing the relevant mode,

the procedure must be started again from initialization. Figure 14.23 shows a sample flowchart

for mode transition during transmission. Port pin states are shown in figures 14.24 and 14.25.

Operation should also be stopped (by clearing TE, TIE, and TEIE to 0) before making a

transition from transmission by DTC transfer to module stop mode or software standby mode

transition. To perform transmission with the DTC after the relevant mode is cleared, setting TE

and TIE to 1 will set the TXI flag and start DTC transmission.

â¢ Reception

Receive operation should be stopped (by clearing RE to 0) before making a module stop mode

or software standby mode transition. RSR, RDR, and SSR are reset. If a transition is made

without stopping operation, the data being received will be invalid.

To continue receiving without changing the reception mode after the relevant mode is cleared,

set RE to 1 before starting reception. To receive with a different receive mode, the procedure

must be started again from initialization.

Figure 14.26 shows a sample flowchart for mode transition during reception.

Rev.6.00 Sep. 27, 2007 Page 662 of 1268

REJ09B0220-0600

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