 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ATmega32A Datasheet(PDF) 132 Page - ATMEL Corporation |
|
|
|||||||||||||||||||||||||||||
ATmega32A Datasheet(HTML) 132 Page - ATMEL Corporation |
|
|
132 / 352 page  132 8155B–AVR–07/09 ATmega32A 17.10 Timer/Counter Prescaler Figure 17-12. 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 disconnected from Port C. A crystal 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 32.768 kHz crystal. Apply- ing an external clock source to TOSC1 is not recommended. For Timer/Counter2, the possible prescaled selections are: clk T2S/8, clkT2S/32, clkT2S/64, clk T2S/128, clkT2S/256, and clkT2S/1024. Additionally, clkT2S as well as 0 (stop) may be selected. Setting the PSR2 bit in SFIOR resets the prescaler. This allows the user to operate with a pre- dictable prescaler. 17.11 Register Description 17.11.1 TCCR2 – Timer/Counter Control Register • Bit 7 – FOC2: Force Output Compare The FOC2 bit is only active when the WGM bits specify a non-PWM mode. However, for ensur- ing compatibility with future devices, this bit must be set to zero when TCCR2 is written when operating in PWM mode. When writing a logical one to the FOC2 bit, an immediate compare match is forced on the waveform generation unit. The OC2 output is changed according to its COM21:0 bits setting. Note that the FOC2 bit is implemented as a strobe. Therefore it is the value present in the COM21:0 bits that determines the effect of the forced compare. 10-BIT T/C PRESCALER TIMER/COUNTER2 CLOCK SOURCE clk I/O clk T2S TOSC1 AS2 CS20 CS21 CS22 0 PSR2 Clear clk T2 Bit 7 65 432 1 0 FOC2 WGM20 COM21 COM20 WGM21 CS22 CS21 CS20 TCCR2 Read/Write 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 |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
