COP8CSDR9KMT7 datasheet(55/80 Pages) NSC

Part #	COP8CSDR9KMT7

Description	8-Bit CMOS Flash Based Microcontroller with 32k Memory, Virtual EEPROM and Brownout

PDF	80 Pages

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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55 / 80 page

15.0 Interrupts (Continued)

STPND flag will have the wrong state. This will allow

maskable interrupts to be acknowledged during the servicing

of the first Software Trap. To avoid problems such as this, the

user program should contain the Software Trap routine to

perform a recovery procedure rather than a return to normal

execution.

Under normal conditions, the STPND flag is reset by a

RPND instruction in the Software Trap service routine. If a

programming error or hardware condition (brownout, power

supply glitch, etc.) sets the STPND flag without providing a

way for it to be cleared, all other interrupts will be locked out.

To alleviate this condition, the user can use extra RPND

instructions in the main program and in the Watchdog ser-

vice routine (if present). There is no harm in executing extra

RPND instructions in these parts of the program.

10138934

FIGURE 28. VIS Flow Chart

COP8CSDR9KMT7 Datasheet(PDF) 55 Page - National Semiconductor (TI)