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H8/3021 Datasheet(PDF) 411 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 411 Page - Renesas Technology Corp

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11. Serial Communication Interface
Rev.2.00 Mar. 22, 2007 Page 387 of 684
REJ09B0352-0200
11.4
SCI Interrupts
The SCI has four interrupt request sources: TEI (transmit-end interrupt), ERI (receive-error
interrupt), RXI (receive-data-full interrupt), and TXI (transmit-data-empty interrupt). Table 11.12
lists the interrupt sources and indicates their priority. These interrupts can be enabled and disabled
by the TIE, RIE, and TEIE bits in SCR. Each interrupt request is sent separately to the interrupt
controller.
The TXI interrupt is requested when the TDRE flag is set to 1 in SSR. The TEI interrupt is
requested when the TEND flag is set to 1 in SSR.
The RXI interrupt is requested when the RDRF flag is set to 1 in SSR. The ERI interrupt is
requested when the ORER, PER, or FER flag is set to 1 in SSR.
Table 11.12 SCI Interrupt Sources
Interrupt
Description
Priority
ERI
Receive error (ORER, FER, or PER)
High
RXI
Receive data register full (RDRF)
TXI
Transmit data register empty (TDRE)
TEI
Transmit end (TEND)
Low



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