 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
AT89LP6440 Datasheet(PDF) 81 Page - ATMEL Corporation |
|
|
|||||||||||||||||||||||||||||
AT89LP6440 Datasheet(HTML) 81 Page - ATMEL Corporation |
|
|
81 / 194 page  81 3706A–MICRO–9/09 AT89LP6440 - Preliminary Figure 13-14. Multi-Phasic PWM Modes 14. External Interrupts The INT0 (P3.2) and INT1 (P3.3) pins of the AT89LP6440 may be used as external interrupt sources. The external interrupts can be programmed to be level-activated or transition-activated by setting or clearing bit IT1 or IT0 in Register TCON. If ITx = 0, external interrupt x is triggered by a detected low at the INTx pin. If ITx = 1, external interrupt x is edge-triggered. In this mode if successive samples of the INTx pin show a high in one cycle and a low in the next cycle, inter- rupt request flag IEx in TCON is set. Flag bit IEx then requests the interrupt. Since the external interrupt pins are sampled once each clock cycle, an input high or low should hold for at least 2 oscillator periods to ensure sampling. If the external interrupt is transition-activated, the external source has to hold the request pin high for at least two clock cycles, and then hold it low for at least two clock cycles to ensure that the transition is seen so that interrupt request flag IEx will be set. IEx will be automatically cleared by the CPU when the service routine is called if gener- ated in edge-triggered mode. If the external interrupt is level-activated, the external source has to hold the request active until the requested interrupt is actually generated. Then the external source must deactivate the request before the interrupt service routine is completed, or else CCA CCB CCC CCD CCA CCB CCC CCD CCA CCB CCC CCD PHSD CCA CCB CCC CCD PHSD CCA CCB CCC CCD PHS = 000B PHS = 001B PHS = 010B PHS = 011B PHS = 100B |
|
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
