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ST9 Datasheet(PDF) 133 Page - STMicroelectronics

Part # ST9
Description  USER GUIDE
PDF  146 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST9 Datasheet(HTML) 133 Page - STMicroelectronics

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ST9 USER GUIDE
6.9 WATCHDOG TIMER
Figure 49
. Watchdog Timer Block Diagram
WDTIN pin
Input Modes and
Clock Control Logic
INTCLK / 4
Prescaler and Counter
Registers Control Logic
WDT CLK
Output
Control Logic
End of Count
WDOUT
pin
NMI
pin
INT 0
pin
INTA 0
request
Reset to
the core
Top level
interrupt
request
EIVR (R246, Page 0)
External Interrupt Vector Register
0
0
1
1
PRS7
PRS0
WDTPR(R250 page 0)
Timer / Watchdog
Prescaler Register
PRS Latch
(read/write)
R15
R0
WDTR (RR248 page 0)
Timer / Watchdog 16-bit Down Counter
Counter Latch (RR248 write only)
7
0
0
15
Current value (RR248 read only)
PRS Current Value
WCR (R252, Page 0)
0
7
Wait Control Register
X WDGEN WDM2 WDM1 WDM0
WPM1 WPM0
WPM2
0
7
V7 V6 V5 V4 TLTEV
IOAS EWEN
TLIS
ST_SP S_C INMD1 INMD2 INEN
OUTEN
WROUT
OUTMD
WDTCR (R251 page 0)
Timer/Watchdog Control Register
70
ST_SP: Start/Stop bit
S_C:
Single-shot/Continuous
INMD1,2: Input mode selection bit
INEN:
Input enable
OUTMD: Output mode
WROUT: Write Out
OUTEN: Output Enable bit
WDGEN: Watchdog Enable bit (active low)
TLIS:
Top level input selection bit
IAOS:
Interrupt channel A0 selection bit
Top level



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