ATAVRSB202 Atmel, ATAVRSB202 Datasheet - Page 173

• Manufacturer Part Number: ATAVRSB202
• Description: KIT BATT MGMT FOR ATMEGA32HVB
• Manufacturer: Atmel

Specifications of ATAVRSB202

• Main Purpose: *
• Embedded: *
• Utilized Ic / Part: *
• Primary Attributes: *
• Secondary Attributes: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 27-3.
8042B–AVR–06/10
Status Code
(TWSR)
Prescaler Bits
are 0
0x08
0x10
0x38
0x40
0x48
0x50
0x58
Status of the Two-wire Serial
Bus and Two-wire Serial Inter-
face Hardware
A START condition has been
transmitted
A repeated START condition
has been transmitted
Arbitration lost in SLA+R or
NOT ACK bit
SLA+R has been transmitted;
ACK has been received
SLA+R has been transmitted;
NOT ACK has been received
Data byte has been received;
ACK has been returned
Data byte has been received;
NOT ACK has been returned
Status Codes for Master Receiver Mode
A REPEATED START condition is generated by writing the following value to TWCR:
After a repeated START condition (state 0x10) the Two-wire Serial Interface can access the
same slave again, or a new slave without transmitting a STOP condition. Repeated START
enables the master to switch between slaves, Master Transmitter mode and Master Receiver
mode without losing control over the bus.
TWCR
Value
TWCR
Value
To/from TWDR
Load SLA+R
Load SLA+R or
Load SLA+W
No TWDR action or
No TWDR action
No TWDR action or
No TWDR action
No TWDR action or
No TWDR action or
No TWDR action
Read data byte or
Read data byte
Read data byte or
Read data byte or
Read data byte
TWINT
TWINT
1
1
Application Software Response
TWEA
TWEA
X
X
STA
X
X
X
0
1
0
0
1
0
1
0
0
1
0
1
STO
TWSTA
TWSTA
0
0
0
0
0
0
0
0
1
1
0
0
0
1
1
0
1
To TWCR
TWINT
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
TWSTO
TWSTO
1
0
TWEA
X
X
X
X
X
0
1
X
X
X
0
1
X
X
X
ATmega16HVB/32HVB
Next Action Taken by TWI Hardware
SLA+R will be transmitted
ACK or NOT ACK will be received
SLA+R will be transmitted
ACK or NOT ACK will be received
SLA+W will be transmitted
Logic will switch to Master Transmitter mode
Two-wire Serial Bus will be released and not ad-
dressed Slave mode will be entered
A START condition will be transmitted when the bus
becomes free
Data byte will be received and NOT ACK will be
returned
Data byte will be received and ACK will be returned
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
Data byte will be received and NOT ACK will be
returned
Data byte will be received and ACK will be returned
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
TWWC
TWWC
X
X
TWEN
TWEN
1
1
–
0
–
0
TWIE
TWIE
X
X
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