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COP8-NSDEV bảng dữ liệu(PDF) 61 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện COP8-NSDEV
Giải thích chi tiết về linh kiện  8-Bit CMOS Flash Microcontroller with 8k Memory, Dual Op Amps, Virtual EEROM, Temperature Sensor,10-Bit A/D and Brownout Reset
PDF  83 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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COP8-NSDEV bảng dữ liệu(HTML) 61 Page - National Semiconductor (TI)

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18.0 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.
18.4.2.1 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
GIE, PSW
; Set the GIE bit
SBIT
EXEN, PSW
; Enable the external interrupt
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
.
.
20006334
FIGURE 33. VIS Flow Chart
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