attiny25v ATMEL Corporation, attiny25v Datasheet - Page 54

• Manufacturer Part Number: attiny25v
• Description: Microcontroller With 2/4/8k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

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 PCINT5:0 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 – PCINT5:0: Pin Change Enable Mask 5:0
Each PCINT5:0 bit selects whether pin change interrupt is enabled on the corresponding I/O pin.
If PCINT5:0 is set and the PCIE bit in GIMSK is set, pin change interrupt is enabled on the corre-
sponding I/O pin. If PCINT5:0 is cleared, pin change interrupt on the corresponding I/O pin is
disabled.
Bit
0x15
Read/Write
Initial Value
7
–
R
0
6
–
R
0
5
PCINT5
R/W
1
4
PCINT4
R/W
1
3
PCINT3
R/W
1
2
PCINT2
R/W
1
1
PCINT1
R/W
1
0
PCINT0
R/W
1
2586K–AVR–01/08
PCMSK