Datasheet

Status Code
(TWSR)
Prescaler
Bits are 0
Status of the Two-Wire Serial
Bus and Two-Wire Serial
Interface Hardware
Application SofTWARne Response Next Action Taken by TWI
Hardware
To/from
TWDRn
To TWCRn
STA STO TWINT TWEA
NOT ACK has been returned 0 0 1 1 Switched to the not addressed
Slave mode;
own SLA will be recognized;
GCA will be recognized if
TWGCE = “1”
1 0 1 0 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
1 0 1 1 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
0xA0 A STOP condition or repeated
START condition has been
received while still addressed
as Slave
No action 0 0 1 0 Switched to the not addressed
Slave mode;
no recognition of own SLA or
GCA
0 0 1 1 Switched to the not addressed
Slave mode;
own SLA will be recognized;
GCA will be recognized if
TWGCE = “1”
1 0 1 0 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
1 0 1 1 Switched to the not addressed
Slave mode;
own SLA will be recognized;
ATmega48PA/88PA/168PA
Two-Wire Serial Interface (TWI)
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40002011A-page 297