SH7708 datasheet(425/633 Pages) RENESAS

425 / 633 page

407

The operating sequence is:

1. The data line is high impedance when not in use and is fixed high with a pull-up resistor.

2. The transmitting side starts one frame of data transmission. The data frame starts with a start

bit (Ds, low level). The start bit is followed by eight data bits (D0–D7) and a parity bit (Dp).

3. On the smart card interface, the data line returns to high impedance after this. The data line is

pulled high with a pull-up resistor.

4. The receiving side checks parity. When the data is received normally with no parity errors, the

receiving side then waits to receive the next data. When a parity error occurs, the receiving

side outputs an error signal (DE, low level) and requests re-transfer of data. The receiving

station returns the signal line to high impedance after outputting the error signal for a specified

period. The signal line is pulled high with a pull-up resistor.

5. The transmitting side transmits the next frame of data unless it receives an error signal. If it

does receive an error signal, it returns to step 2 to re-transmit the erroneous data.

14.3.4

Table 14.3 shows the bit map of the registers that the smart card interface uses. Bits shown as 1 or

0 must be set to the indicated value. The settings for the other bits are described below.

Table 14.3

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SCSMR

H'FFFFFE80

01O/

CKS1

CKS0

SCBRR

H'FFFFFE82

BRR7

BRR6

BRR5

BRR4

BRR3

BRR2

BRR1

BRR0

SCSCR

H'FFFFFE84

TIE

RIE

CKE1

CKE0

SCTDR

H'FFFFFE86

TDR7

TDR6

TDR5

TDR4

TDR3

TDR2

TDR1

TDR0

SCSSR

H'FFFFFE88

TDRE

RDRF

ORER

FER/

ERS

PER

TEND

SCRDR

H'FFFFFE8A

RDR7

RDR6

RDR5

RDR4

RDR3

RDR2

RDR1

RDR0

SCSCMR

H'FFFFFE8C

————

SDIR

SINV

—

SMIF

Note:

Dashes indicate unused bits.

SH7708 Datasheet(PDF) 425 Page - Renesas Technology Corp

SH7708 Datasheet(HTML) 425 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Descarga

Enlace URL