Rainbow-electronics ATmega32L Uživatelský manuál stáhnout pdf (Strana 192)

192

ATmega32(L)

2503C–AVR–10/02

Table 77. Status Codes for Slave Transmitter Mode

Status Code

(TWSR)

Prescaler Bits

are 0

Status of the Two-wire Serial Bus

and Two-wire Serial Interface

Hardware

Application Software Response

Next Action Taken by TWI Hardware

To/from TWDR

To TWCR

STA

STO TWINT TWEA

$A8 Own SLA+R has been received;

ACK has been returned

Load data byte or

Load data byte

Last data byte will be transmitted and NOT ACK should

be received

Data byte will be transmitted and ACK should be re-

ceived

$B0 Arbitration lost in SLA+R/W as

master; own SLA+R has been

received; ACK has been returned

Load data byte or

Load data byte

Last data byte will be transmitted and NOT ACK should

be received

Data byte will be transmitted and ACK should be re-

ceived

$B8 Data byte in TWDR has been

transmitted; ACK has been

received

Load data byte or

Load data byte

Last data byte will be transmitted and NOT ACK should

be received

Data byte will be transmitted and ACK should be re-

ceived

$C0 Data byte in TWDR has been

transmitted; NOT ACK has been

received

No TWDR action or

No TWDR action

Switched to the not addressed Slave mode;

no recognition of own SLA or GCA

Switched to the not addressed Slave mode;

own SLA will be recognized;

GCA will be recognized if TWGCE = “1”

Switched to the not addressed Slave mode;

no recognition of own SLA or GCA;

a START condition will be transmitted when the bus

becomes free

Switched to the not addressed Slave mode;

own SLA will be recognized;

GCA will be recognized if TWGCE = “1”;

a START condition will be transmitted when the bus

becomes free

$C8 Last data byte in TWDR has been

transmitted (TWEA = “0”); ACK

has been received

No TWDR action or

No TWDR action

Switched to the not addressed Slave mode;

no recognition of own SLA or GCA

Switched to the not addressed Slave mode;

own SLA will be recognized;

GCA will be recognized if TWGCE = “1”

Switched to the not addressed Slave mode;

no recognition of own SLA or GCA;

a START condition will be transmitted when the bus

becomes free

Switched to the not addressed Slave mode;

own SLA will be recognized;

GCA will be recognized if TWGCE = “1”;

a START condition will be transmitted when the bus

becomes free

1 2 ... 187 188 189 190 191 192 193 194 195 196 197 ... 312 313

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