HD64336901G Renesas Technology, HD64336901G Datasheet - Page 250
HD64336901G
Manufacturer Part Number
HD64336901G
Description
(HD64xxx Series) 16-BIT MICROCONTROLLER
Manufacturer
Renesas Technology
Datasheet
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14.7
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 14.6 shows the
interrupt sources.
Table 14.6 SCI3 Interrupt Requests
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.
Rev. 1.00, 11/03, page 222 of 376
Interrupt Requests
Receive Data Full
Transmit Data Empty
Transmission End
Receive Error
Interrupts
TXI
Abbreviation
RXI
TEI
ERI
Interrupt Sources
Setting TDRE in SSR
Setting TEND in SSR
Setting OER, FER, and PER in SSR
Setting RDRF in SSR
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