参数资料
型号: ST92E141K4D1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, UVPROM, 25 MHz, MICROCONTROLLER, CDIP32
封装: WINDOWED, SHRINK, CERAMIC, DIP-32
文件页数: 167/178页
文件大小: 1097K
代理商: ST92E141K4D1
89/178
ST92141 - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont’d)
7.1.4 WDT Interrupts
The Timer/Watchdog issues an interrupt request
at every End of Count, when this feature is ena-
bled.
A pair of control bits, IA0S (EIVR.1, Interrupt A0 se-
lection bit) and TLIS (EIVR.2, Top Level Input Se-
lection bit) allow the selection of 2 interrupt sources
(Timer/Watchdog End of Count, or External Pin)
handled in two different ways, as a Top Level Non
Maskable Interrupt (Software Reset), or as a
source for channel A0 of the external interrupt logic.
A block diagram of the interrupt logic is given in
Figure 50.
Note: Software traps can be generated by setting
the appropriate interrupt pending bit.
Table 20 Interrupt Configuration below, shows all
the
possible
configurations
of
interrupt/reset
sources which relate to the Timer/Watchdog.
A reset caused by the watchdog will set bit 6,
WDGRES of R242 - Page 55 (Clock Flag Regis-
ter). See section CLOCK CONTROL REGIS-
TERS.
Figure 50. Interrupt Sources
Table 20. Interrupt Configuration
Legend:
WDG = Watchdog function
SW TRAP = Software Trap
Note: If IA0S and TLIS = 0 (enabling the Watchdog EOC as interrupt source for both Top Level and INTA0
interrupts), only the INTA0 interrupt is taken into account.
TIMER WATC HDOG
RESET
WDGE N (WCR.6)
INTA0 REQUEST
IA0S (EIVR .1)
MUX
0
1
INT0
MUX
0
1
TOP LEVEL
INTERRUP T REQUEST
VA00293
TLIS (EIVR.2)
NMI
Control Bits
Enabled Sources
Operating Mode
WDGEN
IA0S
TLIS
Reset
INTA0
Top Level
0
1
0
1
0
1
WDG/Ext Reset
SW TRAP
Ext Pin
SW TRAP
Ext Pin
SW TRAP
Ext Pin
Watchdog
1
0
1
0
1
0
1
Ext Reset
Timer
Ext Pin
Timer
Ext Pin
Timer
Ext Pin
Timer
9
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