Rainbow-electronics ATtiny43U Bedienungsanleitung PDF herunterladen (Seite 59)

8048B–AVR–03/09

Figure 10-1. Timing of pin change interrupts

10.3 Register Description

10.3.1 MCUCR – MCU Control Register

The External Interrupt Control Register A contains control bits for interrupt sense control.

• Bits 1, 0 – ISC01, ISC00: Interrupt Sense Control 0 Bit 1 and Bit 0

External Interrupt 0 is activated by the external pin INT0 if the I-flag of SREG and the corre-

sponding interrupt mask are set. The level and edges on the external INT0 pin that activate the

interrupt are defined in Table 10-2 on page 60.

Edges on INT0 are registered asynchronously. Pulses on INT0 wider than the pulse width given

in Table 20-6 on page 158 will generate an interrupt. Shorter pulses are not guaranteed to gen-

erate an interrupt.

clk

PCINT(0)

pin_lat

pin_sync

pcint_in_(0)

pcint_syn

cint_setflag

PCIF

PCINT(0)

pin_sync

pcint_syn

pin_lat

D Q

pcint_setflag

clk

PCINT(0) in PCMSK(x)

pcint_in_(0)

Bit 76543210

0x35 (0x55)

BODS PUD SE SM1 SM0 BODSE ISC01 ISC00 MCUCR

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

Initial Value 0 0 0 0 0 0 0 0

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 181 182

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Rainbow-electronics ATtiny43U Bedienungsanleitung Seite 59