H8SX1663 datasheet(776/1158 Pages) RENESAS

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Section 15 Serial Communication Interface (SCI, IrDA, CRC)

Rev.1.00 Jun. 07, 2006 Page 724 of 1102

REJ09B0294-0100

For the direct convention type, logic levels 1 and 0 correspond to states Z and A, respectively, and

data is transferred with LSB-first as the start character, as shown in figure 15.26. Therefore, data

in the start character in the figure is H'3B. When using the direct convention type, write 0 to both

the SDIR and SINV bits in SCMR. Write 0 to the O/

E bit in SMR in order to use even parity,

which is prescribed by the smart card standard.

(Z)

(Z) state

Figure 15.27 Inverse Convention (SDIR = SINV = O/

E = 1)

For the inverse convention type, logic levels 1 and 0 correspond to states A and Z, respectively

and data is transferred with MSB-first as the start character, as shown in figure 15.27. Therefore,

data in the start character in the figure is H'3F. When using the inverse convention type, write 1 to

both the SDIR and SINV bits in SCMR. The parity bit is logic level 0 to produce even parity,

which is prescribed by the smart card standard, and corresponds to state Z. Since the SNIV bit of

this LSI only inverts data bits D7 to D0, write 1 to the O/

E bit in SMR to invert the parity bit in

both transmission and reception.

15.7.3

Block Transfer Mode

Block transfer mode is different from normal smart card interface mode in the following respects.

• Even if a parity error is detected during reception, no error signal is output. Since the PER bit

in SSR is set by error detection, clear the PER bit before receiving the parity bit of the next

frame.

• During transmission, at least 1 etu is secured as a guard time after the end of the parity bit

before the start of the next frame.

• Since the same data is not re-transmitted during transmission, the TEND flag is set 11.5 etu

after transmission start.

• Although the ERS flag in block transfer mode displays the error signal status as in normal

smart card interface mode, the flag is always read as 0 because no error signal is transferred.

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