参数资料
型号: MT80C51-12R
厂商: TEMIC SEMICONDUCTORS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP44
文件页数: 102/170页
文件大小: 4133K
代理商: MT80C51-12R
37
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
Figure 9-1.
Timing of pin change interrupts
9.3
Register Description
9.3.1
EICRA – External Interrupt Control Register A
The External Interrupt Control Register A contains control bits for interrupt sense control.
Bits 7:2 – Res: Reserved Bits
These bits are reserved and will always read zero.
Bits 1:0 – ISC01, ISC00: 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 corresponding interrupt
mask are set. The level and edges on the external INT0 pin that activate the interrupt are defined in Table 9-2. The
value on the INT0 pin is sampled before detecting edges. If edge or toggle interrupt is selected, pulses that last lon-
ger than one clock period will generate an interrupt. Shorter pulses are not guaranteed to generate an interrupt. If
clk
PCINT(0)
pin_lat
pin_sync
pcint_in_(0)
pcint_syn
pcint_setflag
PCIF
PCINT(0)
pin_sync
pcint_syn
pin_lat
D
Q
LE
pcint_setflag
PCIF
clk
PCINT(0) in PCMSK(x)
pcint_in_(0)
0
x
Bit
765
432
10
ISC01
ISC00
EICRA
Read/Write
RR
RRR
R
R/W
Initial Value
000
00
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