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COP888CS Datasheet(PDF) 36 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # COP888CS
Description  8-Bit CMOS ROM Based Microcontrollers with 4k to 24k Memory, Comparators and USART
PDF  53 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

COP888CS Datasheet(HTML) 36 Page - National Semiconductor (TI)

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Interrupts (Continued)
Programming Example: External Interrupt
PSW
=00EF
CNTRL
=00EE
RBIT
0,PORTGC
RBIT
0,PORTGD
; G0 pin configured Hi-Z
SBIT
IEDG, CNTRL
; Ext interrupt polarity; falling edge
SBIT
EXEN, PSW
; Enable the external interrupt
SBIT
GIE, PSW
; Set the GIE bit
WAIT:
JP
WAIT
; Wait for external interrupt
.
.
.
.=0FF
; The interrupt causes a
VIS
; branch to address 0FF
; The VIS causes a branch to
;interrupt vector table
.
.
.
.=01FA
; Vector table (within 256 byte
.ADDRW SERVICE
; of VIS inst.) containing the ext
; interrupt service routine
.
.
INT_EXIT:
RETI
.
.
SERVICE:
RBIT
EXPND, PSW
; Interrupt Service Routine
; Reset ext interrupt pend. bit
.
.
.
JP
INT_EXIT
; Return, set the GIE bit
www.national.com
36



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