HD6417750RF240V Datasheet, PDF (411/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 14 Serial Communication Interface (SCI)
14.8 Interrupts
14.8.1 Interrupts in Normal Serial Communication Interface Mode
Table 14.12 shows the interrupt sources in normal serial communication interface mode. A
different interrupt vector is assigned to each interrupt source, and individual interrupt sources can
be enabled or disabled using the enable bits in SCR.
When the TDRE flag in SSR is set to 1, a TXI interrupt request is generated. When the TEND flag
in SSR is set to 1, a TEI interrupt request is generated. A TXI interrupt can activate the DTC to
perform data transfer. The TDRE flag is cleared to 0 automatically when data is transferred by the
DTC.
When the RDRF flag in SSR is set to 1, an RXI interrupt request is generated. When the ORER,
PER, or FER flag in SSR is set to 1, an ERI interrupt request is generated. An RXI interrupt
request can activate the DTC to transfer data. The RDRF flag is cleared to 0 automatically when
data is transferred by the DTC.
A TEI interrupt is requested when the TEND flag is set to 1 and the TEIE bit is set to 1. If a TEI
interrupt and a TXI interrupt are requested simultaneously, the TXI interrupt has priority for
acceptance. However, if the TDRE and TEND flags are cleared simultaneously by the TXI
interrupt routine, the SCI cannot branch to the TEI interrupt routine later.
Table 14.12 SCI Interrupt Sources
Channel
0
1
2
Name
ERI_0
RXI_0
TXI_0
TEI_0
ERI_1
RXI_1
TXI_1
TEI_1
ERI_2
RXI_2
TXI_2
TEI_2
Interrupt Source
Receive Error
Receive Data Full
Transmit Data Empty
Transmission End
Receive Error
Receive Data Full
Transmit Data Empty
Transmission End
Receive Error
Receive Data Full
Transmit Data Empty
Transmission End
Interrupt Flag
ORER, FER, PER
RDRF
TDRE
TEND
ORER, FER, PER
RDRF
TDRE
TEND
ORER, FER, PER
RDRF
TDRE
TEND
DTC Activation
Not possible
Possible
Possible
Not possible
Not possible
Possible
Possible
Not possible
Not possible
Possible
Possible
Not possible
Rev. 7.00 Sep. 11, 2009 Page 375 of 566
REJ09B0211-0700