Rainbow-electronics ATtiny10 Manual de usuario descargar pdf (Pagina 39)

8127B–AVR–08/09

ATtiny4/5/9/10

9.3.4 PCICR – Pin Change Interrupt Control Register

• Bits 7:1 – Res: Reserved Bits

These bits are reserved and will always read zero.

• Bit 0 – PCIE0: Pin Change Interrupt Enable 0

When the PCIE0 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), pin

change interrupt 0 is enabled. Any change on any enabled PCINT3..0 pin will cause an interrupt.

The corresponding interrupt of Pin Change Interrupt Request is executed from the PCI0 Inter-

rupt Vector. PCINT3..0 pins are enabled individually by the PCMSK Register.

9.3.5 PCIFR – Pin Change Interrupt Flag Register

• Bits 7:1 – Res: Reserved Bits

These bits are reserved and will always read zero.

• Bit 0 – PCIF0: Pin Change Interrupt Flag 0

When a logic change on any PCINT3..0 pin triggers an interrupt request, PCIF0 becomes set

(one). If the I-bit in SREG and the PCIE0 bit in PCICR are set (one), the MCU will jump to the

corresponding Interrupt Vector. The flag is cleared when the interrupt routine is executed. Alter-

natively, the flag can be cleared by writing a logical one to it.

9.3.6 PCMSK – Pin Change Mask Register

• Bits 7:4 – Res: Reserved Bits

These bits are reserved and will always read zero.

• Bits 3:0 – PCINT3..0: Pin Change Enable Mask 3..0

Each PCINT3..0 bit selects whether pin change interrupt is enabled on the corresponding I/O

pin. If PCINT3..0 is set and the PCIE0 bit in PCICR is set, pin change interrupt is enabled on the

corresponding I/O pin. If PCINT3..0 is cleared, pin change interrupt on the corresponding I/O pin

is disabled.

Bit 76543210

0x12

– – – – – – –PCIE0PCICR

Read/Write RRRRRRRR/W

Initial Value 0 0 0 0 0 0 0 0

Bit 76543210

0x11

– – – – – – – PCIF0 PCIFR

Read/Write RRRRRRRR/W

Initial Value 0 0 0 0 0 0 0 0

Bit 76543210

0x10

– – – – PCINT3 PCINT2 PCINT1 PCINT0 PCMSK

Read/Write R R R R R/W R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 165 166

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Rainbow-electronics ATtiny10 Manual de usuario Pagina 39