H8S2245 datasheet(536/818 Pages) RENESAS

tên linh kiện	H8S2245

Giải thích chi tiết về linh kiện	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

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Section 13 Smart Card Interface

Rev.3.00 Mar. 26, 2007 Page 494 of 772

REJ09B0355-0300

Serial Data Reception

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

Figure 13.7 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.

Initialization

Read RDR and clear

RDRF flag in SSR to 0

Clear RE bit to 0

Start reception

Start

Error processing

Yes

ORER = 0 and

PER = 0?

RDRF = 1?

All data received?

Yes

Figure 13.7 Example of Reception Processing Flow

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

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