HD6432351 datasheet(668/1025 Pages) RENESAS

668 / 1025 page

Section 14 Smart Card Interface

Rev. 3.00 Sep 15, 2006 page 634 of 988

REJ09B0330-0300

SCK

Specified pulse width

SCR write

(CKE0 = 0)

SCR write

(CKE0 = 1)

Specified pulse width

Figure 14.8 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 14.8.

Table 14.8 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

Error

ERS

RIE

ERI

Not possible Not possible

Receive

Mode

Normal

operation

RDRF

RIE

RXI

Possible

Error

PER, ORER

RIE

ERI

Not possible Not possible

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