ATmega48PA Atmel Corporation, ATmega48PA Datasheet - Page 235

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ATmega48PA

Manufacturer Part Number
ATmega48PA
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega48PA

Flash (kbytes)
4 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
Yes
Crypto Engine
No
Sram (kbytes)
0.5
Eeprom (bytes)
256
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
Yes
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

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22.7.3
8271D–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
SDA
SCL
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
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
Device 1
RECEIVER
SLAVE
SLA
ATmega48A/PA/88A/PA/168A/PA/328/P
TRANSMITTER
R
Device 2
MASTER
MR
A or A
DATA
$40
$48
$38
$68
A
A
A
$78
Other master
Other master
n
continues
continues
P
$B0
Device 3
DATA
A
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
Other master
DATA
continues
Device n
$58
A
V
CC
$10
P
R
S
R1
SLA
R2
W
R
MT
235

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