ATmega48 Automotive Atmel Corporation, ATmega48 Automotive Datasheet - Page 126
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
ATmega48 Automotive
Manufacturer Part Number
ATmega48 Automotive
Description
Manufacturer
Atmel Corporation
Specifications of ATmega48 Automotive
Flash (kbytes)
4 Kbytes
Pin Count
32
Max. Operating Frequency
16 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)
0.5
Eeprom (bytes)
256
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
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
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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16.3.3
126
Atmel ATtiny24/44/84 [Preliminary]
SPI Slave Operation Example
The following code demonstrates how to use the USI module as a SPI Slave:
The code is size optimized using only eight instructions (+ ret). The code example assumes
that the DO is configured as output and USCK pin is configured as input in the DDR register.
The value stored in register r16 prior to the function being called is transferred to the master
device, and when the transfer is completed, the data received from the master is stored back
into the r16 register.
Note that the first two instructions are for initialization only and need only to be executed once.
These instructions set the three-wire mode and positive edge shift register clock. The loop is
repeated until the USI counter overflow flag is set.
ret
init:
...
SlaveSPITransfer:
SlaveSPITransfer_loop:
out
in
ldi
out
out
ldi
out
in
sbrs
rjmp
in
ret
USICR,r17
r16,USIDR
r16,(1<<USIWM0)|(1<<USICS1)
USICR,r16
USIDR,r16
r16,(1<<USIOIF)
USISR,r16
r16, USISR
r16, USIOIF
SlaveSPITransfer_loop
r16,USIDR
7701E–AVR–02/11
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