Datasheet

Section 13 Serial Communication Interface 3 (SCI3)
Rev.4.00 Nov. 02, 2005 Page 200 of 304
REJ09B0143-0400
13.7 Interrupts
The SCI3 creates the following six interrupt requests: transmission end, transmit data empty,
receive data full, and receive errors (overrun error, framing error, and parity error). Table 13.6
shows the interrupt sources.
Table 13.6 SCI3 Interrupt Requests
Interrupt Requests Abbreviation Interrupt Sources
Receive Data Full RXI Setting RDRF in SSR
Transmit Data Empty TXI Setting TDRE in SSR
Transmission End TEI Setting TEND in SSR
Receive Error ERI Setting OER, FER, and PER in SSR
The initial value of the TDRE flag in SSR is 1. Thus, when the TIE bit in SCR3 is set to 1 before
transferring the transmit data to TDR, a TXI interrupt request is generated even if the transmit data
is not ready. The initial value of the TEND flag in SSR is 1. Thus, when the TEIE bit in SCR3 is
set to 1 before transferring the transmit data to TDR, a TEI interrupt request is generated even if
the transmit data has not been sent. It is possible to make use of the most of these interrupt
requests efficiently by transferring the transmit data to TDR in the interrupt routine. To prevent the
generation of these interrupt requests (TXI and TEI), set the enable bits (TIE and TEIE) that
correspond to these interrupt requests to 1, after transferring the transmit data to TDR.