HD6432670 Hitachi, HD6432670 Datasheet - Page 748

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Channel
0
1
2
15.9.2
Table 15.14 shows the interrupt sources in Smart Card interface mode. The transmit end interrupt
(TEI) request cannot be used in this mode.
Table 15.14 SCI Interrupt Sources
In Smart Card interface mode, as in normal serial communication interface mode, transfer can be
carried out using the DTC or DMAC. In transmit operations, the TDRE flag is also set to 1 at the
same time as the TEND flag in SSR, and a TXI interrupt is generated. If the TXI request is
designated beforehand as a DTC or DMAC activation source, the DTC or DMAC will be activated
by the TXI request, and transfer of the transmit data will be carried out. The TDRE and TEND
flags are automatically cleared to 0 when data transfer is performed by the DTC or DMAC. In the
event of an error, the SCI retransmits the same data automatically. During this period, the TEND
flag remains cleared to 0 and the DTC or DMAC is not activated. Therefore, the SCI and DTC or
DMAC will automatically transmit the specified number of bytes in the event of an error,
including retransmission. However, the ERS flag is not cleared automatically when an error
occurs, and so the RIE bit should be set to 1 beforehand so that an ERI request will be generated in
the event of an error, and the ERS flag will be cleared.
When performing transfer using the DTC or DMAC, it is essential to set and enable the DTC or
DMAC before carrying out SCI setting. For details on the DTC or DMAC setting procedures,
refer to section 9, Data Transfer Controller (DTC) or section 7, DMA Controller (DMAC).
In receive operations, an RXI interrupt request is generated when the RDRF flag in SSR is set to
1. If the RXI request is designated beforehand as a DTC or DMAC activation source, the DTC or
DMAC will be activated by the RXI request, and transfer of the receive data will be carried out.
The RDRF flag is cleared to 0 automatically when data transfer is performed by the DTC or
DMAC. If an error occurs, an error flag is set but the RDRF flag is not. Consequently, the DTC or
Rev. 2.0, 04/02, page 702 of 906
Interrupts in Smart Card Interface Mode
Name
ERI0
RXI0
TXI0
ERI1
RXI1
TXI1
ERI2
RXI2
TXI2
Interrupt Source
Receive Error, detection
Receive Data Full
Transmit Data Empty
Receive Error, detection
Receive Data Full
Transmit Data Empty
Receive Error, detection
Receive Data Full
Transmit Data Empty
Interrupt Flag
ORER, PER, ERS
RDRF
TEND
ORER, PER, ERS
RDRF
TEND
ORER, PER, ERS
RDRF
TEND
DTC
Activation
Not possible
Possible
Possible
Not possible
Possible
Possible
Not possible
Possible
Possible
DMAC
Activation
Not possible
Possible
Possible
Not possible
Possible
Possible
Not possible
Not possible
Not possible
Priority
High
Low