Rainbow-electronics ATmega128L Uživatelský manuál stáhnout pdf (Strana 195)

100

101

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ATmega128(L)

2467B–09/01

Figure 92. 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 ... 190 191 192 193 194 195 196 197 198 199 200 ... 330 331

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