AT89C5122D-RDRUM datasheet(64/208 Pages) ATMEL

64 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

ATR

Answer To Reset. Response from the ICC to a Reset initiated by the Terminal

F and D

F = Clock Rate Conversion Factor, D = Bit rate adjustment factor. ETU is defined as :

ETU = F/(D*f) with f = Card Clock frequency. If f is in Hertz, ETU is in second. F and D

are available in the ATR (byte TA1). The default values are F=372, D=1.

Guard Time

The time between 2 leading edges of the start bit of 2 consecutive characters is com-

prised of the character duration (10) plus the guard time. Be aware that the Guard Time

counter and the Guard Time registers in the AT8xC5122/23 consider the time between 2

consecutive characters. So the equation is Guard Time Counter = Guard Time + 10. In

other words, the Guard Time is the number of Stop Bits between 2 characters sent in

the same direction.

Extra Guard Time

ISO IEC 7816-3 and EMV introduce the Extra Guard time to be added to the minimum

Guard Time. Extra Guard Time only apply to consecutive characters sent by the termi-

nal to the ICC. The TC1 byte in the ATR define the number N. For N=0 the character to

character duration is 12 ETUs. For N=254 the character to character duration is 266. For

N=255 (special case) The minimum character to character duration is to be used : 12 for

T=0 protocol and 11 for T=1 protocol.

Block Guard Time

The time between the leading edges of 2 consecutive characters sent in opposit direc-

tion. ISO IEC 7816-3 and EMV recommend a fixed Block Guard Time of 22 ETUs.

Work Waiting Time (WWT)

In T=0 protocol WWT is the interval between the leading edge of any character sent by

the ICC, and the leading edge of the previous character sent either by the ICC or the

Terminal. If no character is received by the terminal after WWTmax time, the Terminal

initiates a De-Activation Sequence.

Character Waiting Time (CWT)

In T=1 protocol CWT is the interval between the leading edge of 2 consecutive charac-

ters sent by the ICC. If the next character is not received by the Terminal after CWTmax

time, the Terminal initiates a De-Activation Sequence.

Block Waiting Time (BWT)

In T=1 protocol BWT is the interval between the leading edge of the start bit of the last

character sent by the Terminal that gives the right to sent to the ICC, and the leading

edge of the start bit of the first character sent by the ICC. If the first character from the

ICC is not received by the Terminal after BWTmax time, the Terminal initiates a De-Acti-

vation Sequence.

Waiting Time Extention (WTX)

In T=1 protocol the ICC can request a Waiting Time Extension with a S(WTX request)

request. The Terminal should acknowlege it. The Waiting time between the leading

edge of the start bit of the last character sent by the Terminal that gives the right to sent

to the ICC, and the leading edge of the start bit of the first character sent by the ICC will

be BWT*WTX ETUs.

Parity error in T=0 protocol

In T=0 protocol, a Terminal (respectively an ICC) detecting a parity error while receiving

a character shall force the Card IO line at 0 starting at 10.5 ETUs, thus reducing the first

Guard bit by half the time. The Terminal (respectively an ICC) shall maintain a 0 for 1

ETU min and 2 ETUs max (according to ISO IEC) or to 2 ETUs (according to EMV). The

ICC (respectively a Terminal) shall monitor the Card IO to detect this error signal then

attempt to repeat the character. According to EMV, following a parity error the character

can be repeated one time, if parity error is detected again this procedure can be

repeated 3 more times. The same character can be transmitted 5 times in total. ISO

AT89C5122D-RDRUM 数据表(PDF) 64 Page - ATMEL Corporation

AT89C5122D-RDRUM 数据表(HTML) 64 Page - ATMEL Corporation

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

数据表下载