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AT90SCR100 데이터시트(PDF) 302 Page - ATMEL Corporation

부품명 AT90SCR100
상세설명  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 데이터시트(HTML) 302 Page - ATMEL Corporation

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TPR0327AY–SMS–30Jan09
AT90SCR100
address packet. Arbitration will continue until only one Master remains, and this may take many
bits. If several masters are trying to address the same Slave, arbitration will continue into the
data packet.
Figure 22-8.
Arbitration Between Two Masters
Note that arbitration is not allowed between:
• A REPEATED START condition and a data bit.
• A STOP condition and a data bit.
• A REPEATED START and a STOP condition.
It is the user software’s responsibility to ensure that these illegal arbitration conditions never
occur. This implies that in multi-master systems, all data transfers must use the same composi-
tion of SLA+R/W and data packets. In other words: All transmissions must contain the same
number of data packets, otherwise the result of the arbitration is undefined.
22.5
Overview of the TWI Module
The TWI module is comprised of several submodules, as shown in Figure 22-9. All registers
drawn in a thick line are accessible through the AVR data bus.
SDA from
Master A
SDA from
Master B
SDA Line
Synchronized
SCL Line
START
Master A Loses
Arbitration, SDA
A
SDA



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