COP8SCR9IMT8 National Semiconductor, COP8SCR9IMT8 Datasheet - Page 55

• Manufacturer Part Number: COP8SCR9IMT8
• Description: IC MCU EEPROM 8BIT 32K 48-TSSOP
• Manufacturer: National Semiconductor
• Series: COP8™ 8Sr

Specifications of COP8SCR9IMT8

• Core Processor: COP8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: Microwire/Plus (SPI), UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 39
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Other names: *COP8SCR9IMT8

15.0 Interrupts
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
(Continued)
FIGURE 28. VIS Flow Chart
55
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.
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