ATTINY25-20SUR Atmel, ATTINY25-20SUR Datasheet - Page 54

• Manufacturer Part Number: ATTINY25-20SUR
• Description: MCU AVR 2KB FLASH 20MHZ 8SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY25-20SUR

• 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: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.3.4
54
ATtiny25/45/85
PCMSK – Pin Change Mask Register
• Bit 5 – PCIF: Pin Change Interrupt Flag
When a logic change on any PCINT[5:0] pin triggers an interrupt request, PCIF becomes set
(one). If the I-bit in SREG and the PCIE bit in GIMSK are set (one), the MCU will jump to the cor-
responding Interrupt Vector. The flag is cleared when the interrupt routine is executed.
Alternatively, the flag can be cleared by writing a logical one to it.
• Bits 7:6 – Res: Reserved Bits
These bits are reserved bits in the ATtiny25/45/85 and will always read as zero.
• Bits 5:0 – PCINT[5:0]: Pin Change Enable Mask 5:0
Each PCINT[5:0] bit selects whether pin change interrupt is enabled on the corresponding I/O
pin. If PCINT[5:0] is set and the PCIE bit in GIMSK is set, pin change interrupt is enabled on the
corresponding I/O pin. If PCINT[5:0] is cleared, pin change interrupt on the corresponding I/O
pin is disabled.
Bit
0x15
Read/Write
Initial Value
R
7
–
0
R
6
–
0
PCINT5
R/W
5
0
PCINT4
R/W
4
0
PCINT3
R/W
3
0
PCINT2
R/W
2
0
PCINT1
R/W
1
0
PCINT0
R/W
0
0
2586M–AVR–07/10
PCMSK