Rev. 1.0, 09/02, page 351 of 568
14.8 Interrupt
Sources
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
Name
Interrupt Source
Interrupt Flag
DTC Activation
ERI_0
Receive Error
ORER, FER, PER
Not possible
RXI_0
Receive Data Full
RDRF
Possible
TXI_0
Transmit Data Empty
TDRE
Possible
0
TEI_0
Transmission End
TEND
Not possible
ERI_2
Receive Error
ORER, FER, PER
Not possible
RXI_2
Receive Data Full
RDRF
Possible
TXI_2
Transmit Data Empty
TDRE
Possible
2
TEI_2
Transmission End
TEND
Not possible
Содержание H8S/2627
Страница 22: ...Rev 1 0 09 02 page xx of xxxvi Index 565 ...
Страница 30: ...Rev 1 0 09 02 page xxviii of xxxiv ...
Страница 36: ...Rev 1 0 09 02 page xxxiv of xxxiv Table 23 9 Flash Memory Characteristics 561 ...
Страница 82: ...Rev 1 0 09 02 page 46 of 568 ...
Страница 88: ...Rev 1 0 09 02 page 52 of 568 ...
Страница 98: ...Rev 1 0 09 02 page 62 of 568 ...
Страница 156: ...Rev 1 0 09 02 page 120 of 568 ...
Страница 390: ...Rev 1 0 09 02 page 354 of 568 ...
Страница 480: ...Rev 1 0 09 02 page 444 of 568 ...
Страница 512: ...Rev 1 0 09 02 page 476 of 568 ...
Страница 527: ...Rev 1 0 09 02 page 491 of 568 21 8 5 Writing to MSTPCR MSTPCR should only be written to by the CPU ...
Страница 528: ...Rev 1 0 09 02 page 492 of 568 ...
Страница 580: ...Rev 1 0 09 02 page 544 of 568 ...