HD6433636SW datasheet(258/418 Pages) RENESAS

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Continuous Transmit/Receive Operation Using Interrupts: Continuous transmit and receive

operations are possible with SCI3, using the RXI or TXI interrupts. Table 10.13 explains this use

of these interrupts.

Table 10.13 Transmit/Receive Interrupts

Interrupt

Flag

Interrupt Conditions

Remarks

RXI

RDRF

RIE

When serial data is received normally

and receive data is transferred from

RSR to RDR, RDRF is set to 1. If RIE

is 1 at this time, RXI is enabled and

an interrupt occurs. (See figure 10.4

(a).)

The RXI interrupt handling routine

reads the receive data from RDR

and clears RDRF to 0.

Continuous data reception is

possible by performing these

operations before the reception of

the next serial data in RSR is

completed.

TXI

TDRE

TIE

When TSR empty (previous

transmission complete) is detected

and the transmit data set in TDR is

transferred to TSR, TDRE is set to 1.

If TIE is 1 at this time, TXI is enabled

and an interrupt occurs. (See figure

10.4 (b).)

The TXI interrupt handling routine

writes the next transmit data to

TDR and clears TDRE to 0.

Continuous data transmission is

possible by performing these

operations before the

transmission of data transferred

to TSR is completed.

TEI

TEND

TEIE

When the last bit of the TSR transmit

character has been sent, if TDRE is 1,

then 1 is set in TEND. If TEIE is 1 at

this time, TEI is enabled and an

interrupt occurs. (See figure 10.4 (c).)

TEI indicates that, when the last

bit of the TSR transmit character

was sent, the next transmit data

had not been written to TDR.

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