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參數資料
型號： W83637HF
廠商： WINBOND ELECTRONICS CORP
英文描述： LPC I/O
中文描述： LPC的I / O
文件頁數： 100/149頁
文件大小： 936K
代理商： W83637HF
W83637HF
Publication Release Date: June 25, 2003
- 95 -
Revision 1.3
To meet another timing requirement, tc of ISO/IEC 7816-3, a counter based on SCCLK is implemented
to start counting on the rising edge of SCRST#. SCPWR# is deactivated if no ATR (Answer To
Reset) is detected after 65536 clock cycles from the rising edge of SCRST#.
7.7 Answer-to-Reset
Answer-to-Reset (ATR) is the data streams sent by the card to the interface as an answer to a reset on
SCRST# signal. Refer to ISO/IEC 7816-3 for detailed description of ATR.
There're two kind of cards specified in ISO/IEC 7816-3, inverse convention card and direct convention
card. Although these two conventions treat logical meanings (0 or 1) of voltage levels (low or high)
differently, Winbond's implementation of Smart Card interface decodes a high voltage level data bit as
"1" and low voltage level data bit "0" nevertheless and resorts to software to interpret incoming data.
Software driver needs to interpret initial character of ATR first to determine which convention is for
inserted card and chooses a conversion procedure for it. Subsequent incoming data bytes must be
passed through a conversion procedure before actually transfers these data bytes to host. Similar
conversion procedure must be applied to outgoing data byte before writing to TBR too.
For example, the raw data byte for initial character of inverse-convention ATR would be 03h.
Software driver therefore needs a conversion procedure to reverse bit-significance and polarity to
process subsequent raw data bytes. On the other hand, initial character of direct-convention ATR is
3Bh which needs no conversion procedure to process data byte.
7.8 Data Transfer
Software driver might need to configure control registers again based on information contained in ATR
before process subsequent data transfer. The following guidelines are provided for programming
reference.
1. EPE should be set to "1" for direct-convention card and otherwise for inverse-convention card.
2. BLH, BLL and CBR should be set to comply with Fi and Di.
3. GTR is used for various stop bit requirement of different transmission protocols.
4. SCIODIR controls direction of data transfer.
5. Use interrupt resources to control communication sequence.
6. Monitor SCSR for transmission integrity.
7.9 Cold Reset and Warm Reset
Cold reset is achieved by writing a "1" to bit 7 of ECR. It deactivates SCPWR# to high.
Consequentially, SCRST# is pulled down and SCCLK is stopped. User must write a "0" to ECR bit 7
to resume Smart Card interface to a normal activation state as described in section 2.3.2 assuming
card is still present.
Writing a "1" to ECR bit 0 triggers a warm reset. This is a self-cleared reset operation unlike cold
reset which needs explicit cancellation. Its effect is similar to cold reset except SCPWR# is kept
activated and therefore power supply to card stays on.
相關PDF資料
PDF描述
W83637HF-AW LPC I/O
W83697HF WINBOND I/O
W83697 WINBOND I/O
W83697F WINBOND I/O
W83697SF WINBOND I/O
相關代理商/技術參數
參數描述
W83637HF_06 制造商:WINBOND 制造商全稱:Winbond 功能描述:LPC I/O
W83637HF-AW 制造商:WINBOND 制造商全稱:Winbond 功能描述:LPC I/O
W83637HG 制造商:WINBOND 制造商全稱:Winbond 功能描述:LPC I/O
W83637HG-AW 功能描述:IC I/O CONTROLLER 128-QFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:* 標準包裝:3,000 系列:- 應用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應商設備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2
W83667HG-B 制造商:Nuvoton Technology Corp 功能描述:LPC SUPER I/O, PECI 1.1A*, SST 制造商:Nuvoton Technology 功能描述:LPC SUPER I/O, PECI 1.1A*, SST
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