ATTINY20-EK1 Atmel, ATTINY20-EK1 Datasheet - Page 149

• Manufacturer Part Number: ATTINY20-EK1
• Description: KIT EVAL TOUCH ATTINY20
• Manufacturer: Atmel

Specifications of ATTINY20-EK1

• Sensor Type: *
• Sensing Range: *
• Interface: *
• Sensitivity: *
• Voltage - Supply: *
• Embedded: *
• Utilized Ic / Part: *
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: TinyAVR
• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Mcu Supported Families: ATtiny20
• Tool / Board Applications: Microcontroller
• Rohs Compliant: Yes
• Tool Type: Development Kit
• Cpu Core: AVR 8
• Data Bus Width: 8 bit
• Processor To Be Evaluated: ATtiny20
• Interface Type: Touch
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ATtiny20
If TWASIE in TWSCRA is set, a STOP condition on the bus will also set TWASIF. STOP condi-
tion will set the flag only if system clock is faster than the minimum bus free time between STOP
and START.
Writing a one to this bit will clear the flag. This flag is also automatically cleared when writing a
valid command to the TWCMDn bits in TWSCRB.
• Bit 5 – TWCH: TWI Clock Hold
This bit is set when the slave is holding the SCL line low.
This bit is read-only, and set when TWDIF or TWASIF is set. The bit can be cleared indirectly by
clearing the interrupt flags and releasing the SCL line.
• Bit 4 – TWRA: TWI Receive Acknowledge
This bit contains the most recently received acknowledge bit from the master.
This bit is read-only. When zero, the most recent acknowledge bit from the maser was ACK and,
when one, the most recent acknowledge bit was NACK.
• Bit 3 – TWC: TWI Collision
This bit is set when the slave was not able to transfer a high data bit or a NACK bit. When a col-
lision is detected, the slave will commence its normal operation, and disable data and
acknowledge output. No low values are shifted out onto the SDA line.
This bit is cleared by writing a one to it. The bit is also cleared automatically when a START or
Repeated START condition is detected.
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