H8SLASH3028F datasheet(562/923 Pages) RENESAS

562 / 923 page

Rev. 2.00, 09/03, page 532 of 890

Switching Modes: When switching from receive mode to transmit mode, first confirm that the

receive operation has been completed, then start from initialization, clearing RE to 0 and setting

TE to 1. The RDRF, PER, or ORER flag 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 to 0 and setting RE to 1. The TEND

flag can be used to check that the transmit operation has been completed.

Fixing Clock Output: When the GM bit is set to 1 in SMR, clock output can be fixed by means

of the CKE1 and CKE0 bits in SCR. The minimum clock pulse width can be set to the specified

width in this case.

Figure 14.9 shows the timing for fixing clock output. In this example, GM = 1, CKE1 = 0, and the

CKE0 bit is controlled.

Specified pulse

width

CKE1 value

SCK

Specified pulse

width

SCR write

(CKE0 = 1)

SCR write

(CKE0 = 0)

Figure 14.9 Timing for Fixing Cock Output

Interrupt Operations: The smart card interface has three interrupt sources: transmit-data-empty

(TXI), transmit/receive-error (ERI), and receive-data-full (RXI). The transmit-end interrupt

request (TEI) is not available in smart card mode.

A TXI interrupt is requested when the TEND flag is set to 1 in SSR. An RXI interrupt is requested

when the RDRF flag is set to 1 in SSR. An ERI interrupt is requested when the ORER, PER, or

ERS flag is set to 1 in SSR. These relationships are shown in table 14.8.

H8/3028F Datasheet(PDF) 562 Page - Renesas Technology Corp