ATmega48 Automotive Atmel Corporation, ATmega48 Automotive Datasheet - Page 22
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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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- Download datasheet (4Mb)
6.5
6.5.1
6.5.2
6.5.3
6.5.4
22
Register Description
Atmel ATtiny24/44/84 [Preliminary]
EEARH – EEPROM Address Register
EEARL – EEPROM Address Register
EEDR – EEPROM Data Register
EECR – EEPROM Control Register
• Bits 7..1 – Res: Reserved Bits
These are reserved bits in the ATtiny24/44/84, and will always read as zero.
• Bit 0 – EEAR8: EEPROM Address
The EEPROM address register, EEARH, specifies the most-significant bit for EEPROM
address in the 512-byte EEPROM space for Tiny84. This bit is reserved in the ATtiny24/44,
and will always read as zero. The initial value of EEAR is undefined. A proper value must be
written before the EEPROM may be accessed.
• Bits 7..0 – EEAR7..0: EEPROM Address
The EEPROM address register, EEARL, specifies the EEPROM address. In the 128-byte
EEPROM space in ATiny24, bit 7 is reserved and will always read as zero. The EEPROM data
bytes are addressed linearly between 0 and 128/256/512. The initial value of EEAR is unde-
fined. A proper value must be written before the EEPROM may be accessed.
• Bits 7..0 – EEDR7..0: EEPROM Data
For the EEPROM write operation the EEDR Register contains the data to be written to the
EEPROM in the address given by the EEAR Register. For the EEPROM read operation, the
EEDR contains the data read out from the EEPROM at the address given by EEAR.
Bit
0x1F (0x3F)
Read/Write
Initial Value
Bit
0x1E (0x3E)
Read/Write
Initial Value
Bit
0x1D (0x3D)
Read/Write
Initial Value
Bit
0x1C (0x3C)
Read/Write
Initial Value
EEAR7
EEDR7
R/W
R/W
R
R
7
–
0
7
X
7
0
7
–
0
EEAR6
EEDR6
R/W
R/W
R
R
6
X
6
0
6
–
0
6
–
0
EEAR5
EEDR5
EEPM1
R/W
R/W
R/W
R
5
X
5
0
X
5
–
0
5
EEAR4
EEDR4
EEPM0
R/W
R/W
R/W
R
4
X
4
0
X
4
–
0
4
EEAR3
EEDR3
EERIE
R/W
R/W
R/W
R
X
3
–
0
3
3
0
3
0
EEAR2
EEDR2
EEMPE
R/W
R/W
R/W
R
X
2
–
0
2
2
0
2
0
EEAR1
EEDR1
EEPE
R/W
R/W
R/W
X
1
–
R
0
1
1
0
1
X
EEAR0
EEDR0
EEAR8
EERE
R/W
R/W
R/W
R/W
X
X
0
0
0
0
0
0
7701E–AVR–02/11
EEARH
EEARL
EEDR
EECR
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