H8SLASH3028F datasheet(560/923 Pages) RENESAS

560 / 923 page

Rev. 2.00, 09/03, page 530 of 890

1. Data write

TDR

TSR

(shift register)

Data 1

2. Transfer from TDR to TSR

Data 1

Data remains in TDR

Data 1

3. Serial data output

Note: When the ERS flag is set, it should be cleared until transfer of the last bit (D7 in LSB-first

transmission, D0 in MSB-first transmission) of the retransmit data to be transmitted next has

been completed.

In case of normal transmission: TEND flag is set

In case of transmit error:

ERS flag is set

Steps 2 and 3 above are repeated until the

TEND flag is set.

I/O signal

output

Data 1

Figure 14.6 Relation Between Transmit Operation and Internal Registers

I/O data

When GM = 0

Guard time

12.5 etu

11.0 etu

When GM = 1

TXI (TEND

interrupt)

Note: etu (Elementary time unit: the time for transfer of one bit)

Figure 14.7 Timing of TEND Flag Setting

Receiving Serial Data: Data reception in smart card mode uses the same processing procedure as

for the normal SCI. Figure 14.8 shows a sample reception processing flowchart.

1. Perform smart card interface mode initialization as described in Initialization above.

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

appropriate receive error handling, 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. To continue receiving data, clear the RDRF flag to 0 and go back to step 2.

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

H8/3028F Datasheet(PDF) 560 Page - Renesas Technology Corp

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