ATMEGA64L-8MQR Atmel, ATMEGA64L-8MQR Datasheet - Page 207
ATMEGA64L-8MQR
Manufacturer Part Number
ATMEGA64L-8MQR
Description
MCU AVR 64KB FLASH 8MHZ 64QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA64L-8MQR
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 207 of 392
- Download datasheet (8Mb)
TWSR – TWI Status
Register
2490Q–AVR–06/10
is detected, and then generates a new START condition to claim the Bus Master status. TWSTA
must be cleared by software when the START condition has been transmitted.
• Bit 4 – TWSTO: TWI STOP Condition Bit
Writing the TWSTO bit to one in Master mode will generate a STOP condition on the Two-wire
Serial Bus. When the STOP condition is executed on the bus, the TWSTO bit is cleared auto-
matically. In Slave mode, setting the TWSTO bit can be used to recover from an error condition.
This will not generate a STOP condition, but the TWI returns to a well-defined unaddressed
Slave mode and releases the SCL and SDA lines to a high impedance state.
• Bit 3 – TWWC: TWI Write Collision Flag
The TWWC bit is set when attempting to write to the TWI Data Register – TWDR when TWINT is
low. This flag is cleared by writing the TWDR Register when TWINT is high.
• Bit 2 – TWEN: TWI Enable Bit
The TWEN bit enables TWI operation and activates the TWI interface. When TWEN is written to
one, the TWI takes control over the I/O pins connected to the SCL and SDA pins, enabling the
slew-rate limiters and spike filters. If this bit is written to zero, the TWI is switched off and all TWI
transmissions are terminated, regardless of any ongoing operation.
• Bit 1 – Res: Reserved Bit
This bit is a reserved bit and will always read as zero.
• Bit 0 – TWIE: TWI Interrupt Enable
When this bit is written to one, and the I-bit in SREG is set, the TWI interrupt request will be acti-
vated for as long as the TWINT flag is high.
• Bits 7..3 – TWS: TWI Status
These five bits reflect the status of the TWI logic and the Two-wire Serial Bus. The different sta-
tus codes are described later in this section. Note that the value read from TWSR contains both
the 5-bit status value and the 2-bit prescaler value. The application designer should mask the
prescaler bits to zero when checking the status bits. This makes status checking independent of
prescaler setting. This approach is used in this datasheet, unless otherwise noted.
• Bit 2 – Res: Reserved Bit
This bit is reserved and will always read as zero.
Bit
(0x71)
Read/Write
Initial Value
TWS7
R
7
1
TWS6
R
6
1
TWS5
R
5
1
TWS4
4
R
1
TWS3
R
3
1
R
2
–
0
TWPS1
R/W
1
0
ATmega64(L)
TWPS0
R/W
0
0
TWSR
207
Related parts for ATMEGA64L-8MQR
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
IC AVR MCU 64K 8MHZ COM 64-QFN
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC AVR MCU 64K 8MHZ 3V 64TQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC AVR MCU 64K 8MHZ 3V 64-QFN
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC MCU AVR 64K FLASH 64-QFN
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC AVR MCU 64K LV 8MHZ COM64TQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC AVR MCU 64K LV 8MHZ IND64TQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC AVR MCU 64K 8MHZ IND 64-QFN
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
MCU AVR 64KB FLASH 8MHZ 64QFN
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC MCU AVR 64K FLASH 64-TQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC MCU AVR 64K 5V 8MHZ 64-TQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC MCU AVR 64K 5V 8MHZ 64-QFN
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC MCU AVR 64K 8MHZ 3V 64TQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC MCU AVR 64K FLASH 64TQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet: