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參數(shù)資料
| 型號： | MQ80C154-L16/883R |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 16 MHz, MICROCONTROLLER, CQFP44 |
| 文件頁數(shù)： | 43/49頁 |
| 文件大小： | 61013K |
| 代理商： | MQ80C154-L16/883R |
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ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
18.10 Timer/Counter Prescaler
Figure 18-12. Prescaler for Timer/Counter2.
The clock source for Timer/Counter2 is named clk
T2S. clkT2S is by default connected to the main system I/O clock
clk
IO. By setting the AS2 bit in ASSR, Timer/Counter2 is asynchronously clocked from the TOSC1 pin. This
enables use of Timer/Counter2 as a Real Time Counter (RTC). When AS2 is set, pins TOSC1 and TOSC2 are dis-
connected from Port C. A XTAL can then be connected between the TOSC1 and TOSC2 pins to serve as an
independent clock source for Timer/Counter2. The Oscillator is optimized for use with a 32.768kHz XTAL. If apply-
ing an external clock on TOSC1, the EXCLK bit in ASSR must be set.
For Timer/Counter2, the possible prescaled selections are: clk
T2S/8, clkT2S/32, clkT2S/64, clkT2S/128, clkT2S/256, and
clk
T2S/1024. Additionally, clkT2S as well as 0 (stop) may be selected. Setting the PSR2 bit in GTCCR resets the
prescaler. This allows the user to operate with a predictable prescaler.
10-BIT T/C PRESCALER
TIMER/COUNTER2 CLOCK SOURCE
clk
I/O
clk
T2S
TOSC1
AS2
CS20
CS21
CS22
clk
T2S
/8
clk
T2S
/64
clk
T2S
/128
clk
T2S
/1024
clk
T2S
/256
clk
T2S
/32
0
PSR2
Clear
clk
T2
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