COP8CFE9IMT9/NOPB National Semiconductor, COP8CFE9IMT9/NOPB Datasheet - Page 42

• Manufacturer Part Number: COP8CFE9IMT9/NOPB
• Description: IC MCU EEPROM 8BIT 8K 48-TSSOP
• Manufacturer: National Semiconductor
• Series: COP8™ 8Cr

Specifications of COP8CFE9IMT9/NOPB

• Core Processor: COP8
• Core Size: 8-Bit
• Connectivity: Microwire/Plus (SPI)
• Peripherals: POR, PWM, WDT
• Number Of I /o: 39
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 48-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Speed: -
• Eeprom Size: -
• Other names: *COP8CFE9IMT9; *COP8CFE9IMT9/NOPB; COP8CFE9IMT9

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9.0 Interrupts
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 Example: External Interrupt
WAIT:
PSW
CNTRL
RBIT
RBIT
SBIT
SBIT
SBIT
JP
.
.
.
.=0FF
VIS
.
.
.
.=01FA
.ADDRW SERVICE
.
.
(Continued)
=00EF
=00EE
0,PORTGC
0,PORTGD
IEDG, CNTRL
GIE, PSW
EXEN, PSW
WAIT
FIGURE 25. VIS Flow Chart
; G0 pin configured Hi-Z
; Ext interrupt polarity; falling edge
; Set the GIE bit
; Enable the external interrupt
; Wait for external interrupt
; The interrupt causes a
; branch to address 0FF
; The VIS causes a branch to
; interrupt vector table
; Vector table (within 256 byte
; of VIS inst.) containing the ext
; interrupt service routine
42
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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