參數(shù)資料
型號(hào): COP8SDR9
廠商: National Semiconductor Corporation
英文描述: 8-Bit CMOS Flash Based Microcontroller with 32k Memory, Virtual EEPROM and Brownout(8位基于CMOS 閃速存儲(chǔ)器的帶32K存儲(chǔ)器,虛擬EEPROM和電壓過低復(fù)位的微控制器)
中文描述: 8位CMOS閃存為基礎(chǔ)的32K的內(nèi)存,虛擬EEPROM和欠壓(8位基于的CMOS閃速存儲(chǔ)器的帶32K的存儲(chǔ)器,微控制器虛擬的EEPROM和電壓過低復(fù)位的微控制器)
文件頁數(shù): 46/68頁
文件大?。?/td> 714K
代理商: COP8SDR9
9.0 Interrupts
(Continued)
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.
Programming Example: External Interrupt
PSW
CNTRL
RBIT
RBIT
SBIT
SBIT
SBIT
WAIT:
JP
.
.
.
.=0FF
VIS
=00EF
=00EE
0,PORTGC
0,PORTGD
IEDG, CNTRL
GIE, PSW
EXEN, PSW
WAIT
; 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
.
.
.
.=01FA
.ADDRW SERVICE
; Vector table (within 256 byte
; of VIS inst.) containing the ext
; interrupt service routine
.
.
.
DS101389-34
FIGURE 27. VIS Flow Chart
C
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46
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