H8S2245 datasheet(20/818 Pages) RENESAS

20 / 818 page

Rev.3.00 Mar. 26, 2007 Page xx of xlii

REJ09B0355-0300

Item

Page Revision (See Manual for Details)

12.4 SCI Interrupt

462

Note

* added

When TDRE flag in ... The TDRE flag is cleared to 0

automatically when data transfer is performed by the DTC*. The

DTC cannot be activated by ...

When RDRF flag in ... The RDRF flag is cleared to 0

automatically when data transfer is performed by the DTC*. The

DTC cannot be activated by an ERI interrupt request.

Note:

* The flag is not cleared when DISEL is 0 and the transfer

counter value is not 0.

12.5 Usage Notes

464

Description added

The following points should be noted when using the SCI.

Module Stop Mode Setting

SCI operation can be disabled or enabled using the module stop

control register. The initial setting is for SCI operation to be

halted. Register access is enabled by clearing module stop

mode. For details, see section 18, Power-Down Modes.

Relation between Writes to TDR and TDRE Flag

467

Restrictions Concerning DTC Updating

...

• When RDR is read by the DTC, be sure to set the activation

source to the relevant SCI reception data full interrupt (RXI).

• The flag is cleared only when DISEL in DTC is 0 with the

transfer counter not being 0. When DISEL is 1,or DISEL is 0 with

the transfer counter being 0, the flag should be cleared by CPU.

Note that transmitting, in particular, may not successfully be

executed unless the TDRE flag is cleared by CPU.

467

472

Description of "Operation in Case of Mode Transition" and

"Switching from SCK Pin Function to Port Pin Function" added

13.2.2 Serial Status

479

Bit 2 TEND description amended

[Clearing conditions]

• When 0 is written to ...

• When the DTC* is activated by a TXI interrupt and write data

to TDR

[Setting conditions] ...

• When TDRE = 1 and ERS = 0 (normal transmission) 12.5 etu

after transmission of 1-byte serial character when GM = 0

• When TDRE = 1 and ERS = 0 (normal transmission) 11.0 etu

after transmission of 1-byte serial character when GM = 1

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