H838532H datasheet(335/508 Pages) RENESAS

335 / 508 page

Section 10 Serial Communication Interface

Rev. 1.00 May 30, 2008 Page 315 of 484

REJ09B0436-0100

(3) Interrupts and Continuous Transmission/Reception

SCI3 can carry out continuous reception using RXI and continuous transmission using TXI. These

interrupts are shown in table 10.10.

Table 10.10 Transmit/Receive Interrupts

Interrupt

Flags

Interrupt Request Conditions

Notes

RXI

RDRF

RIE

When serial reception is performed

normally and receive data is transferred

from RSR to RDR, bit RDRF is set to 1,

and if bit RIE is set to 1 at this time, RXI

is enabled and an interrupt is requested.

(See figure 10.2(a).)

The RXI interrupt routine reads the

receive data transferred to RDR

and clears bit RDRF to 0.

Continuous reception can be

performed by repeating the above

operations until reception of the

next RSR data is completed.

TXI

TDRE

TIE

When TSR is found to be empty (on

completion of the previous transmission)

and the transmit data placed in TDR is

transferred to TSR, bit TDRE is set to 1.

If bit TIE is set to 1 at this time, TXI is

enabled and an interrupt is requested.

(See figure 10.2(b).)

The TXI interrupt routine writes the

next transmit data to TDR and

clears bit TDRE to 0. Continuous

transmission can be performed by

repeating the above operations until

the data transferred to TSR has

been transmitted.

TEI

TEND

TEIE

When the last bit of the character in

TSR is transmitted, if bit TDRE is set to

1, bit TEND is set to 1. If bit TEIE is set

to 1 at this time, TEI is enabled and an

interrupt is requested. (See figure

10.2(c).)

TEI indicates that the next transmit

data has not been written to TDR

when the last bit of the transmit

character in TSR is sent.

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