Datasheet

Section 15 Smart Card Interface
Rev.6.00 Sep. 27, 2007 Page 692 of 1268
REJ09B0220-0600
SCK
Specified pulse width
SCR write
(CKE0 = 0)
SCR write
(CKE0 = 1)
Specified pulse width
Figure 15.8 Timing for Fixing Clock Output
Interrupt Operation (Except Block Transfer Mode): There are three interrupt sources in smart
card interface mode: transmit-data-empty interrupt (TXI) requests, transmit/receive-error interrupt
(ERI) requests, and receive-data-full interrupt (RXI) requests. The transmit-end interrupt (TEI)
request is not used in this mode.
When the TEND flag in SSR is set to 1, a TXI interrupt request is generated.
When the RDRF flag in SSR is set to 1, an RXI interrupt request is generated.
When any of flags ORER, PER, and ERS in SSR is set to 1, an ERI interrupt request is generated.
The relationship between the operating states and interrupt sources is shown in table 15.8.
Note: For details of operation in block transfer mode, see section 14.4, SCI Interrupts.
Table 15.8 Smart Card Mode Operating States and Interrupt Sources
Operating State Flag Enable Bit
Interrupt
Source
DTC
Activation
DMAC
*
Activation
Transmit
Mode
Normal
operation
TEND TIE TXI Possible Possible
Error ERS RIE ERI Not possible Not possible
Receive
Mode
Normal
operation
RDRF RIE RXI Possible Possible
Error PER, ORER RIE ERI Not possible Not possible
Note: * The DMAC is not supported in the H8S/2321.