參數(shù)資料
型號(hào)： Tiny12
廠商： Atmel Corp.
英文描述： 8-bit AVR Microcontroller with 1K Byte Flash
中文描述： 8位AVR微控制器，帶有1K字節(jié)閃存
文件頁數(shù)： 33/91頁
文件大小： 1137K
代理商： TINY12
33
ATtiny11/12
1006D–AVR–07/03
Timer/Counter0
The ATtiny11/12 provides one general-purpose 8-bit Timer/Counter – Timer/Counter0.
The Timer/Counter0 has prescaling selection from the 10-bit prescaling timer. The
Timer/Counter0 can either be used as a timer with an internal clock timebase or as a
counter with an external pin connection that triggers the counting.
Timer/Counter Prescaler
Figure 23 shows the Timer/Counter prescaler.
Figure 23.
Timer/Counter0 Prescaler
The four different prescaled selections are: CK/8, CK/64, CK/256 and CK/1024 where
CK is the oscillator clock. CK, external source and stop, can also be selected as clock
sources.
Figure 24 shows the block diagram for Timer/Counter0.
The 8-bit Timer/Counter0 can select clock source from CK, prescaled CK, or an external
pin. In addition, it can be stopped as described in the specification for the
Timer/Counter0 Control Register – TCCR0. The overflow status flag is found in the
Timer/Counter Interrupt Flag Register – TIFR. Control signals are found in the
Timer/Counter0 Control Register – TCCR0. The interrupt enable/disable settings for
Timer/Counter0 are found in the Timer/Counter Interrupt Mask Register – TIMSK.
When Timer/Counter0 is externally clocked, the external signal is synchronized with the
oscillator frequency of the CPU. To ensure proper sampling of the external clock, the
minimum time between two external clock transitions must be at least one internal CPU
clock period. The external clock signal is sampled on the rising edge of the internal CPU
clock.
The 8-bit Timer/Counter0 features both a high-resolution and a high-accuracy usage
with the lower prescaling opportunities. Similarly, the high-prescaling opportunities
make the Timer/Counter0 useful for lower-speed functions or exact-timing functions with
infrequent actions.
10-BIT T/C PRESCALER
0
TIMER/COUNTER0 CLOCK SOURCE
TCK0
CK
T0
CS00
CS01
CS02
C
C
C
C
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