ATtiny88 Atmel Corporation, ATtiny88 Datasheet - Page 43
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ATtiny88
Manufacturer Part Number
ATtiny88
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny88
Flash (kbytes)
8 Kbytes
Pin Count
32
Max. Operating Frequency
12 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
28
Ext Interrupts
28
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
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)
64
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
2
Output Compare Channels
4
Input Capture Channels
1
Pwm Channels
2
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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8.2
8.2.1
8008H–AVR–04/11
Reset Sources
Power-on Reset
The ATtiny48/88 has four sources of reset:
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
level. The POR circuit can be used to trigger the start-up Reset, as well as to detect a failure in
supply voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in RESET after V
when V
Figure 8-2.
Figure 8-3.
• Power-on Reset. The MCU is reset when the supply voltage is below the Power-on Reset
• External Reset. The MCU is reset when a low level is present on the RESET pin for longer
• Watchdog System Reset. The MCU is reset when the Watchdog Timer period expires and
• Brown-out Reset. The MCU is reset when the supply voltage V
threshold (V
than the required pulse length.
the Watchdog System Reset mode is enabled.
Reset threshold (V
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
RESET
RESET
CC
RESET
RESET
V
V
decreases below the detection level.
CC
CC
Table 22-3 on page
MCU Start-up, RESET Tied to V
MCU Start-up, RESET Extended Externally
POT
), or when the supply voltage falls rapidly.
BOT
) and the Brown-out Detector is enabled.
V
V
V
POT
POT
RST
CC
209. The POR is activated whenever V
t
TOUT
rise. The RESET signal is activated again, without any delay,
V
CC
RST
t
TOUT
CC
is below the Brown-out
CC
ATtiny48/88
is below the detection
43