ATmega32A Atmel Corporation, ATmega32A Datasheet - Page 194

• Manufacturer Part Number: ATmega32A
• Manufacturer: Atmel Corporation

Specifications of ATmega32A

• Flash (kbytes): 32 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): 2
• Eeprom (bytes): 1024
• 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

20.7.3
8155C–AVR–02/11
Slave Receiver Mode
Figure 20-14. 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
Figure
zero or are masked to zero.
Figure 20-15. Data Transfer in Slave Receiver Mode
To initiate the Slave Receiver mode, TWAR and TWCR must be initialized as follows:
TWAR
Value
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
20-15). All the status codes mentioned in this section assume that the prescaler bits are
From master to slave
From slave to master
$08
S
TWA6
Device 1
RECEIVER
SLAVE
SLA
TWA5
TRANSMITTER
Device 2
R
MASTER
MR
A or A
DATA
$40
$48
$38
$68
A
A
A
TWA4
$78
Device’s Own Slave Address
Other master
Other master
n
continues
continues
P
Device 3
$B0
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 Two-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
DATA
continues
Device n
V
$58
CC
A
TWA1
ATmega32A
$10
P
R
R1
S
TWA0
SLA
R2
W
R
TWGCE
MT
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