 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
COP87L22CJM-1N Datasheet(PDF) 8 Page - National Semiconductor (TI) |
|
|
||||||||||||||||||||||||||||||
COP87L22CJM-1N Datasheet(HTML) 8 Page - National Semiconductor (TI) |
|
|
8 / 32 page  Functional Description (Continued) If the external or RC Clock option is being used RAM Contents UNCHANGED Timer T1 and A Contents UNCHANGED WATCHDOG Timer PrescalerCounter ALTERED The external RESET takes priority over the Brown Out Re- set Note If the RESET pin is pulled low while Brown Out occurs (Brown Out circuit has detected Brown Out condition) the external reset will not occur until the Brown Out condition is removed External reset has priority only if VCC is greater than the Brown Out voltage RC l 5 c Power Supply Rise Time TLDD11208 – 6 FIGURE 4 Recommended Reset Circuit WATCHDOG RESET With WATCHDOG enabled the WATCHDOG logic resets the device if the user program does not service the WATCH- DOG timer within the selected service window The WATCHDOG reset does not disable the WATCHDOG Upon WATCHDOG reset the WATCHDOG Prescaler Counter are each initialized with FF Hex The following actions occur upon WATCHDOG reset that are different from external reset WDREN WATCHDOG Reset Enable bit UNCHANGED WDUDF WATCHDOG Underflow bit UNCHANGED Additional initialization actions that occur as a result of WATCHDOG reset are as follows Port L TRI-STATE Port G TRI-STATE Port D HIGH PC CLEARED Ram Contents UNCHANGED B X SP UNCHANGED PSW CNTRL1 and CNTRL2 (except WDUDF Bit) Registers CLEARED Multi-Input Wakeup Registers WKEDG WKEN CLEARED WKPND UNKNOWN Data and Configuration Registers forLG CLEARED WATCHDOG Timer PrescalarCounter each loaded with FF BROWN OUT RESET The on-board Brown Out protection circuit resets the device when the operating voltage (VCC) is lower than the Brown Out voltage The device is held in reset when VCC stays below the Brown Out Voltage The device will remain in RESET as long as VCC is below the Brown Out Voltage The Device will resume execution if VCC rises above the Brown Out Voltage If a two pin crystalresonator clock option is selected the Brown Out reset will trigger a 256tc delay This delay allows the oscillator to stabilize before the device ex- its the reset state The delay is not used if the clock option is either RC or external clock The contents of data registers and RAM are unknown following a Brown Out reset The external reset takes priority over Brown Out Reset and will deactivate the 256 tc cycles delay if in progress The Brown Out reset takes priority over the WATCHDOG reset The following actions occur as a result of Brown Out reset Port L TRI-STATE Port G TRI-STATE Port D HIGH PC CLEARED RAM Contents RANDOM B X SP UNKNOWN PSW CNTRL1 CNTRL2 and WDREG Registers CLEARED Multi-Input Wakeup Registers WKEDG WKEN CLEARED WKPND UNKNOWN Data and Configuration Registers forLG CLEARED WATCHDOG Timer PrescalarCounter each loaded with FF Timer T1 and Accumulator Unknown data after coming out of the HALT (through Brown Out Reset) with any Clock option Note The development system will detect the BROWN OUT RESET exter- nally and will force the RESET pin low The Development System does not emulate the 256tc delay Brown Out Detection An on-board detection circuit monitors the operating voltage (VCC) and compares it with the minimum operating voltage specified The Brown Out circuit is designed to reset the device if the operating voltage is below the Brown Out volt- age (between 18V to 42V at b40 Cto a85 C) The Mini- mum operating voltage for the device is 25V with Brown Out disabled but with BROWN OUT enabled the device is guaranteed to operate properly down to minimum Brown Out voltage (Max frequency 4 MHz) For temperature range of 0 Cto70 C the Brown Out voltage is expected to be between 19V to 39V The circuit can be enabled or dis- abled by Brown Out mask option If the device is intended to operate at lower VCC (lower than Brown Out voltage VBO max) the Brown Out circuit should be disabled by the mask option The Brown Out circuit may be used as a power-up reset provided the power supply rise time is slower than 50 ms (0V to 60V) Note Brown Out Circuit is active in HALT mode (with the Brown Out mask option selected) http www nationalcom 8 |
Similar Part No. - COP87L22CJM-1N |
|
Similar Description - COP87L22CJM-1N |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | 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
