ATmega16A Atmel Corporation, ATmega16A Datasheet - Page 203
ATmega16A
Manufacturer Part Number
ATmega16A
Description
Manufacturer
Atmel Corporation
Specifications of ATmega16A
Flash (kbytes)
16 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
3
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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20.9.5
8154B–AVR–07/09
TWA R– TWI (Slave) Address Register
• Bits 7:0 – TWD: TWI Data Register
These eight bits contain the next data byte to be transmitted, or the latest data byte received on
the Two-wire Serial Bus.
The TWAR should be loaded with the 7-bit Slave address (in the seven most significant bits of
TWAR) to which the TWI will respond when programmed as a Slave Transmitter or receiver. In
multi-master systems, TWAR must be set in Masters which can be addressed as Slaves by
other Masters.
The LSB of TWAR is used to enable recognition of the general call address ($00). There is an
associated address comparator that looks for the Slave address (or general call address if
enabled) in the received serial address. If a match is found, an interrupt request is generated.
• Bits 7:1 – TWA[6:0]: TWI (Slave) Address Register
These seven bits constitute the Slave address of the TWI unit.
• Bit 0 – TWGCE: TWI General Call Recognition Enable Bit
If set, this bit enables the recognition of a General Call given over the Two-wire Serial Bus.
Bit
Read/Write
Initial Value
TWA6
R/W
7
1
TWA5
R/W
6
1
TWA4
R/W
5
1
TWA3
R/W
4
1
TWA2
R/W
3
1
TWA1
R/W
2
1
TWA0
R/W
1
1
ATmega16A
TWGCE
R/W
0
0
TWAR
203
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