Rainbow-electronics ATmega32L Instrukcja Użytkownika Pobierz pdf (Strona 172)

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ATmega32(L)

2503C–AVR–10/02

Figure 83. 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 composition 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.

SDA from

Master A

SDA from

Master B

SDA Line

Synchronized

SCL Line

START

Master A Loses

Arbitration, SDA

SDA

1 2 ... 167 168 169 170 171 172 173 174 175 176 177 ... 312 313

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