Renesas H8S Series Hardware Manual page 560

16-bit single-chip microcomputer

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Table of Contents

Serial Data Reception: Data reception in Smart Card mode uses the same processing procedure as for the normal SCI.

Figure 15-7 shows an example of the transmission processing flow.

[1] Perform Smart Card interface mode initialization as described above in Initialization.

[2] Check that the ORER flag and PER flag in SSR are cleared to 0. If either is set, perform the appropriate receive error

processing, then clear both the ORER and the PER flag to 0.

[3] Repeat steps [2] and [3] until it can be confirmed that the RDRF flag is set to 1.

[4] Read the receive data from RDR.

[5] When receiving data continuously, clear the RDRF flag to 0 and go back to step [2].

[6] To end reception, clear the RE bit to 0.

With the above processing, interrupt servicing or data transfer by the DMAC or DTC 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.

If the DMAC or DTC is activated by an RXI request, the receive data in which the error occurred is skipped, and only the

number of bytes of receive data set in the DMAC or DTC are transferred.

For details, see Interrupt Operation and Data Transfer Operation by DMAC or DTC below.

Rev.6.00 Oct.28.2004 page 532 of 1016

REJ09B0138-0600H

Initialization

Start reception

ORER = 0 and

Read RDR and clear

RDRF flag in SSR to 0

All data received?

Clear RE bit to 0

Figure 15-7 Example of Reception Processing Flow

Error processing