ATmega88 Atmel Corporation, ATmega88 Datasheet - Page 228

• Manufacturer Part Number: ATmega88
• Manufacturer: Atmel Corporation

Specifications of ATmega88

• Flash (kbytes): 8 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 23
• Ext Interrupts: 24
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• 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: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

22.7.3
2545T–AVR–05/11
Slave receiver mode
Figure 22-14. Formats and states in the master receiver mode.
In the Slave Receiver mode, a number of data bytes are received from a Master Transmitter
(see
are zero or are masked to zero.
Figure 22-15. Data transfer in slave receiver mode.
To initiate the Slave Receiver mode, TWAR and TWCR must be initialized as follows:
TWAR
Value
Figure
Successfull
reception
from a slave
receiver
Next transfer
started with a
repeated start
condition
Not acknowledge
received after the
slave address
Arbitration lost in slave
address or data byte
Arbitration lost and
addressed as slave
SDA
SCL
22-15). All the status codes mentioned in this section assume that the prescaler bits
From master to slave
From slave to master
$08
S
TWA6
SLA
Device 1
RECEIVER
SLAVE
TWA5
R
MR
TRANSMITTER
Device 2
A or A
DATA
MASTER
$40
$48
$38
$68
A
A
A
$78
TWA4
Other master
Other master
n
continues
continues
P
Device’s own slave address
$B0
Device 3
DATA
A
TWA3
Any number of data bytes
and their associated acknowledge bits
This number (contained in TWSR) corresponds
to a defined state of the 2-wire serial bus. The
prescaler bits are zero or masked to zero
........
$50
$38
To corresponding
states in slave mode
A
A
TWA2
Other master
Device n
DATA
continues
ATmega48/88/168
V
CC
$58
A
TWA1
R1
$10
P
R
S
R2
SLA
TWA0
W
R
TWGCE
MT
228