 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
AT90USB646 Datasheet(PDF) 145 Page - ATMEL Corporation |
|
|
|||||||||||||||||||||||||||||
AT90USB646 Datasheet(HTML) 145 Page - ATMEL Corporation |
|
|
145 / 434 page  145 7593A–AVR–02/06 AT90USB64/128 If external pin modes are used for the Timer/Countern, transitions on the Tn pin will clock the counter even if the pin is configured as an output. This feature allows software control of the counting. 14.10.5 Timer/Counter1 Control Register C – TCCR1C 14.10.6 Timer/Counter3 Control Register C – TCCR3C • Bit 7 – FOCnA: Force Output Compare for Channel A • Bit 6 – FOCnB: Force Output Compare for Channel B • Bit 5 – FOCnC: Force Output Compare for Channel C The FOCnA/FOCnB/FOCnC bits are only active when the WGMn3:0 bits specifies a non-PWM mode. When writing a logical one to the FOCnA/FOCnB/FOCnC bit, an immediate compare match is forced on the waveform generation unit. The OCnA/OCnB/OCnC output is changed according to its COMnx1:0 bits setting. Note that the FOCnA/FOCnB/FOCnC bits are imple- mented as strobes. Therefore it is the value present in the COMnx1:0 bits that determine the effect of the forced compare. A FOCnA/FOCnB/FOCnC strobe will not generate any interrupt nor will it clear the timer in Clear Timer on Compare Match (CTC) mode using OCRnA as TOP. The FOCnA/FOCnB/FOCnB bits are always read as zero. • Bit 4:0 – Reserved Bits These bits are reserved for future use. For ensuring compatibility with future devices, these bits must be written to zero when TCCRnC is written. 14.10.7 Timer/Counter1 – TCNT1H and TCNT1L Table 14-5. Clock Select Bit Description CSn2 CSn1 CSn0 Description 0 0 0 No clock source. (Timer/Counter stopped) 001 clk I/O/1 (No prescaling 010 clkI/O/8 (From prescaler) 011 clk I/O/64 (From prescaler) 100 clk I/O/256 (From prescaler) 101 clkI/O/1024 (From prescaler) 1 1 0 External clock source on Tn pin. Clock on falling edge 1 1 1 External clock source on Tn pin. Clock on rising edge Bit 7654 3 210 FOC1A FOC1B FOC1C – – – – – TCCR1C Read/Write W W W R R R R R Initial Value 0 0 0 0 0 0 0 0 Bit 7654 3 210 FOC3A FOC3B FOC3C – – – – – TCCR3C Read/Write W W W R R R R R Initial Value 0 0 0 0 0 0 0 0 Bit 7654 32 1 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
