Datasheet

Rev.6.00 Oct.28.2004 page 533 of 1016
REJ09B0138-0600H
If a parity error occurs during reception and the PER is set to 1, the received data is still transferred to RDR, and therefore
this data can be read.
Mode Switching Operation: When switching from receive mode to transmit mode, first confirm that the receive
operation has been completed, then start from initialization, clearing RE bit to 0 and setting TE bit to 1. The RDRF flag or
the PER and ORER flags can be used to check that the receive operation has been completed.
When switching from transmit mode to receive mode, first confirm that the transmit operation has been completed, then
start from initialization, clearing TE bit to 0 and setting RE bit to 1. The TEND flag can be used to check that the transmit
operation has been completed.
Fixing Clock Output Level: When the GSM bit in SMR is set to 1, the clock output level can be fixed with bits CKE1
and CKE0 in SCR. At this time, the minimum clock pulse width can be made the specified width.
Figure 15-8 shows the timing for fixing the clock output level. In this example, GSM is set to 1, CKE1 is cleared to 0, and
the CKE0 bit is controlled.
SCK
Specified pulse width
SCR write
(CKE0 = 0)
SCR write
(CKE0 = 1)
Specified pulse width
Figure 15-8 Timing for Fixing Clock Output Level
Interrupt Operation: There are three interrupt sources in Smart Card interface mode: transmit data empty interrupt (TXI)
requests, transfer 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.
Table 15-8 Smart Card Mode Operating States and Interrupt Sources
Operating State Flag Enable Bit
Interrupt
Source
DMAC
Activation
DTC
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
Data Transfer Operation by DMAC or DTC: In Smart Card mode, as with the normal SCI, transfer can be carried out
using the DMAC or DTC. In a transmit operation, 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 DMAC or DTC activation source,
the DMAC or DTC will be activated by the TXI request, and transfer of the transmit data will be carried out. The TDRE