ATmega32 Atmel Corporation, ATmega32 Datasheet - Page 192

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ATmega32

Manufacturer Part Number
ATmega32
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega32

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

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Slave Transmitter
Mode
2503Q–AVR–02/11
Figure 91. Formats and States in the Slave Receiver Mode
In the Slave Transmitter mode, a number of data bytes are transmitted to a master receiver (see
Figure
or are masked to zero.
Figure 92. Data Transfer in Slave Transmitter Mode
To initiate the Slave Transmitter mode, TWAR and TWCR must be initialized as follows:
TWAR
Value
SDA
SCL
92). All the status codes mentioned in this section assume that the prescaler bits are zero
Reception of the own
slave address and one or
more data bytes. All are
acknowledged
Last data byte received
is not acknowledged
Arbitration lost as master
and addressed as slave
Reception of the general call
address and one or more data
bytes
Last data byte received is
not acknowledged
Arbitration lost as master and
addressed as slave by general call
From master to slave
From slave to master
TWA6
TRANSMITTER
Device 1
SLAVE
S
TWA5
SLA
Device 2
General Call
RECEIVER
MASTER
TWA4
Device’s Own Slave Address
W
DATA
Device 3
$60
$68
$70
$78
TWA3
A
A
A
A
n
A
TWA2
DATA
DATA
........
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
TWA1
Device n
$80
$90
A
A
V
CC
DATA
DATA
ATmega32(L)
TWA0
R1
$80
$90
$88
$98
A
A
A
A
TWGCE
R2
P or S
P or S
P or S
P or S
$A0
$A0
192

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