H8SLASH3021 datasheet(439/712 Pages) RENESAS

439 / 712 page

12. Smart Card Interface

Rev.2.00 Mar. 22, 2007 Page 415 of 684

REJ09B0352-0200

With the above processing, interrupt servicing is possible.

If reception ends and the RDRF flag is set to 1 while the RIE bit is set to 1 and interrupt requests

are enabled, a receive data full interrupt (RXI) request will be generated. If an error occurs in

reception and either the ORER flag or the PER flag is set to 1, a transfer error interrupt (ERI)

request will be generated.

For details, see Interrupt Operation below.

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.

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 12.8.

Table 12.8

Smart Card Mode Operating States and Interrupt Sources

Operating State

Flag

Mask Bit

Interrupt Source

Transmit

Mode

Normal

operation

TEND

TIE

TXI

Error

ERS

RIE

ERI

Receive

Mode

Normal

operation

RDRF

RIE

RXI

Error

PER, ORER

RIE

ERI

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