ATmega168P Atmel Corporation, ATmega168P Datasheet - Page 22

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ATmega168P

Manufacturer Part Number
ATmega168P
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega168P

Flash (kbytes)
16 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
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)
1
Eeprom (bytes)
512
Self Program Memory
YES
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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8.6
8.6.1
8.6.2
8.6.3
22
Register Description
ATmega48P/88P/168P
EEARH and EEARL – The EEPROM Address Register
EEDR – The EEPROM Data Register
EECR – The EEPROM Control Register
• Bits 15:9 – Reserved
These bits are reserved bits in the ATmega48P/88P/168P and will always read as zero.
• Bits 8:0 – EEAR[8:0]: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the
256/512/512 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0
and 255/511/511. The initial value of EEAR is undefined. A proper value must be written before
the EEPROM may be accessed.
EEAR8 is an unused bit in ATmega48P and must always be written to zero.
• Bits 7:0 – EEDR[7:0]: 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.
• Bits 7:6 – Reserved
These bits are reserved bits in the ATmega48P/88P/168P and will always read as zero.
• Bits 5, 4 – EEPM1 and EEPM0: EEPROM Programming Mode Bits
The EEPROM Programming mode bit setting defines which programming action that will be trig-
gered when writing EEPE. It is possible to program data in one atomic operation (erase the old
value and program the new value) or to split the Erase and Write operations in two different
operations. The Programming times for the different modes are shown in
Bit
0x22 (0x42)
0x21 (0x41)
Read/Write
Initial Value
Bit
0x20 (0x40)
Read/Write
Initial Value
Bit
0x1F (0x3F)
Read/Write
Initial Value
EEAR7
MSB
R/W
R/W
15
R
X
R
7
0
7
0
7
0
EEAR6
R/W
R/W
14
R
R
X
6
0
6
0
6
0
EEPM1
EEAR5
R/W
R/W
R/W
13
R
5
X
5
0
X
5
0
EEPM0
EEAR4
R/W
R/W
R/W
12
X
R
X
4
4
0
4
0
EEAR3
EERIE
R/W
R/W
R/W
11
R
3
0
3
0
X
3
0
EEMPE
EEAR2
R/W
R/W
R/W
10
R
X
2
0
2
0
2
0
EEAR1
EEPE
R/W
R/W
R/W
R
9
1
0
X
1
0
X
1
Table
EEAR8
EEAR0
EERE
8-1. While EEPE
R/W
R/W
LSB
R/W
R/W
X
X
8
0
0
0
0
0
8025M–AVR–6/11
EEARH
EEARL
EEDR
EECR

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