ATTINY22L(2000) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATTINY22L
(Rev.:2000)

8-bit Microcontroller with 2K Bytes of In-System Programmable Flash

Atmel Corporation 

Figure 21. Reset Logic

VCC

RESET

Power-On Reset

Circuit

100 - 500K

Reset Circuit

POR

Watchdog

Timer

On-Chip

RC-Oscillator

14-Stage Ripple Counter

Q0

Q3

Q13

ATtiny22L

S

Q

R

Q

INTERNAL

RESET

The ATtiny22L has a fixed startup time.

Table 3. Reset Characteristics (VCC = 5.0V)

Symbol

Parameter

Min

Typ

VPOT(1)

Power-On Reset Threshold Voltage, rising

Power-On Reset Threshold Voltage, falling

1.0

0.4

1.4

0.6

VRST

RESET Pin Threshold Voltage

0.6 VCC

tTOUT

Reset Delay Time-Out Period ATtiny22L

11

16

Notes: 1. The Power-On Reset will not work unless the supply voltage has been below VPOT (falling).

Table 4. Reset Characteristics (VCC = 3.0V)

Symbol

Parameter

Min

Typ

Power-On Reset Threshold Voltage, rising

1.0

1.4

VPOT(1)

Power-On Reset Threshold Voltage, falling

0.4

0.6

VRST

tTOUT

Notes:

RESET Pin Threshold Voltage

Reset Delay Time-Out Period ATtiny22L

0.6 VCC

22

32

1. The Power-On Reset will not work unless the supply voltage has been below VPOT (falling).

Max

1.8

0.8

21

Max

1.8

0.8

42

Units

V

V

V

µs

Units

V

V

V

µs

Power-On Reset

The ATtiny22L is designed for use in systems where it can operate from the internal RC oscillator. After VCC has reached

VPOT, the device will start after the time tTOUT (see Figure 22).

The start-up time tTOUT is one RC-oscillator cycle. The frequency of the RC oscillator is voltage dependent as shown in

“Typical characteristics” on page 44.

19

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