ATmega88 Atmel Corporation, ATmega88 Datasheet - Page 34
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ATmega88
Manufacturer Part Number
ATmega88
Description
Manufacturer
Atmel Corporation
Specifications of ATmega88
Flash (kbytes)
8 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
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
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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9.7
2545T–AVR–05/11
128kHz internal oscillator
Table 9-8.
Notes:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 9-9.
Note:
The 128kHz internal oscillator is a low power oscillator providing a clock of 128kHz. The fre-
quency is nominal at 3V and 25°C. This clock may be select as the system clock by
programming the CKSEL fuses to “11” as shown in
Table 9-10.
Note:
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 9-11.
Note:
Power conditions
BOD enabled
Fast rising power
Slowly rising power
BOD enabled
Fast rising power
Slowly rising power
Power conditions
9-9.
9-11.
1. The device is shipped with this option selected.
2. If 8MHz frequency exceeds the specification of the device (depends on V
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
2. The device is shipped with this option selected.
1. Note that the 128kHz oscillator is a very low power clock source, and is not designed for a high
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
Fuse can be programmed in order to divide the internal frequency by 8.
14CK + 4.1ms to ensure programming mode can be entered.
accuracy.
14CK + 4.1ms to ensure programming mode can be entered.
Frequency range (MHz)
Internal calibrated RC oscillator operating modes
Start-up times for the internal calibrated RC Oscillator clock selection.
128kHz internal oscillator operating modes.
Start-up times for the 128kHz internal oscillator.
7.3 - 8.1
Nominal frequency
128kHz
power-down and power-save
power-down and power-save
Start-up time from
Start-up time from
Reserved
Reserved
6CK
6CK
6CK
6CK
6CK
6CK
Table
9-10.
Additional delay from
Additional delay from
ATmega48/88/168
reset (V
(1)(2)
14CK + 65ms
14CK + 4.1ms
14CK + 64ms
14CK + 4ms
.
CKSEL3..0
14CK
14CK
reset
0010
CC
CKSEL3..0
(1)
= 5.0V)
(1)
0011
(2)
CC
), the CKDIV8
SUT1..0
SUT1..0
00
01
10
11
00
01
10
11
34