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143

8008H–AVR–04/11

ATtiny48/88

the Master to switch between Slaves, Master Transmitter mode and Master Receiver mode with-

out losing control of the bus.

Table 15-2.

Status codes for Master Transmitter Mode

Status Code

(TWSR)

Prescaler Bits

are 0

Status of the 2-wire Serial Bus

and 2-wire Serial Interface

Hardware

Application Software Response

Next Action Taken by TWI Hardware

To/from TWDR

To TWCR

STA

STO

TWIN

TWE

0x08

A START condition has been

transmitted

Load SLA+W

SLA+W will be transmitted;

ACK or NOT ACK will be received

0x10

A repeated START condition

has been transmitted

Load SLA+W or

Load SLA+R

SLA+W will be transmitted;

ACK or NOT ACK will be received

SLA+R will be transmitted;

Logic will switch to Master Receiver mode

0x18

SLA+W has been transmitted;

ACK has been received

Load data byte or

No TWDR action or

No TWDR action

Data byte will be transmitted and ACK or NOT ACK will

be received

Repeated START will be transmitted

STOP condition will be transmitted and

TWSTO Flag will be reset

STOP condition followed by a START condition will be

transmitted and TWSTO Flag will be reset

0x20

SLA+W has been transmitted;

NOT ACK has been received

Load data byte or

No TWDR action or

No TWDR action

Data byte will be transmitted and ACK or NOT ACK will

be received

Repeated START will be transmitted

STOP condition will be transmitted and

TWSTO Flag will be reset

STOP condition followed by a START condition will be

transmitted and TWSTO Flag will be reset

0x28

Data byte has been transmit-

ted;

ACK has been received

Load data byte or

No TWDR action or

No TWDR action

Data byte will be transmitted and ACK or NOT ACK will

be received

Repeated START will be transmitted

STOP condition will be transmitted and

TWSTO Flag will be reset

STOP condition followed by a START condition will be

transmitted and TWSTO Flag will be reset

0x30

Data byte has been transmit-

ted;

NOT ACK has been received

Load data byte or

No TWDR action or

No TWDR action

Data byte will be transmitted and ACK or NOT ACK will

be received

Repeated START will be transmitted

STOP condition will be transmitted and

TWSTO Flag will be reset

STOP condition followed by a START condition will be

transmitted and TWSTO Flag will be reset

0x38

Arbitration lost in SLA+W or

data bytes

No TWDR action or

No TWDR action

2-wire Serial Bus will be released and not addressed

Slave mode entered

A START condition will be transmitted when the bus

becomes free

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