Rainbow-electronics ATmega32L Bedienungsanleitung PDF herunterladen (Seite 186)

186

ATmega32(L)

2503C–AVR–10/02

Table 75. Status Codes for Master Receiver Mode

Status Code

(TWSR)

Prescaler Bits

are 0

Status of the Two-wire Serial

Bus and Two-wire Serial Inter-

face Hardware

Application Software Response

Next Action Taken by TWI Hardware

To/from TWDR

To TWCR

STA

STO TWINT TWEA

$08 A START condition has been

transmitted

Load SLA+R 0 0 1 X SLA+R will be transmitted

ACK or NOT ACK will be received

$10 A repeated START condition

has been transmitted

Load SLA+R or

Load SLA+W

SLA+R will be transmitted

ACK or NOT ACK will be received

SLA+W will be transmitted

Logic will switch to masTer Transmitter mode

$38 Arbitration lost in SLA+R or NOT

ACK bit

No TWDR action or

No TWDR action

Two-wire Serial Bus will be released and not addressed

slave mode will be entered

A START condition will be transmitted when the bus

becomes free

$40 SLA+R has been transmitted;

ACK has been received

No TWDR action or

No TWDR action

Data byte will be received and NOT ACK will be

returned

Data byte will be received and ACK will be returned

$48 SLA+R has been transmitted;

NOT ACK has been received

No TWDR action or

No TWDR action

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

$50 Data byte has been received;

ACK has been returned

Read data byte or

Read data byte

Data byte will be received and NOT ACK will be

returned

Data byte will be received and ACK will be returned

$58 Data byte has been received;

NOT ACK has been returned

Read data byte or

Read data byte

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

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