ATTINY25-20SI Atmel, ATTINY25-20SI Datasheet - Page 52
![IC AVR MCU 2K 20MHZ 8SOIC](/photos/6/50/65032/453-8-soic_sml.jpg)
ATTINY25-20SI
Manufacturer Part Number
ATTINY25-20SI
Description
IC AVR MCU 2K 20MHZ 8SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY25-20SI
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
6
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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9.2.2
9.3
9.3.1
52
Register Description
ATtiny25/45/85
Pin Change Interrupt Timing
MCUCR – MCU Control Register
An example of timing of a pin change interrupt is shown in
Figure 9-1.
The External Interrupt Control Register A contains control bits for interrupt sense control.
• Bits 1:0 – ISC0[1:0]: Interrupt Sense Control 0 Bit 1 and Bit 0
The External Interrupt 0 is activated by the external pin INT0 if the SREG I-flag and the corre-
sponding interrupt mask are set. The level and edges on the external INT0 pin that activate the
interrupt are defined in
If edge or toggle interrupt is selected, pulses that last longer than one clock period will generate
an interrupt. Shorter pulses are not guaranteed to generate an interrupt. If low level interrupt is
pcint_setflag
Bit
0x35
Read/Write
Initial Value
pcint_in_(0)
PCINT(0)
pcint_syn
pin_sync
pin_lat
PCINT(0)
PCIF
clk
clk
Timing of pin change interrupts
BODS
R
7
0
LE
pin_lat
Table
PUD
R/W
D
6
0
Q
9-2. The value on the INT0 pin is sampled before detecting edges.
pin_sync
PCINT(0) in PCMSK(x)
R/W
SE
5
0
SM1
R/W
4
0
pcint_in_(0)
SM0
R/W
3
0
0
x
clk
Figure
BODSE
R
2
0
9-1.
pcint_syn
ISC01
R/W
1
0
pcint_setflag
ISC00
R/W
0
0
2586M–AVR–07/10
MCUCR
PCIF
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