COP8SA-DM National Semiconductor, COP8SA-DM Datasheet - Page 83

• Manufacturer Part Number: COP8SA-DM
• Description: MODULE DEBUGGING FOR COP8SA
• Manufacturer: National Semiconductor

Specifications of COP8SA-DM

• Module/board Type: Debugger Module
• For Use With/related Products: Cop 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *COP8SA-DM

state. Upon triggering the WATCHDOG, the logic will pull the WDOUT (G1) pin low for
an additional 16 tc–32 tc cycles after the signal level on WDOUT pin goes below the lower
Schmitt trigger threshold. After this delay, the device will stop forcing the WDOUT
output low.The WATCHDOG service window will restart when the WDOUT pin goes
high.
A WATCHDOG service while the WDOUT signal is active will be ignored. The state of
the WDOUT pin is not guaranteed on reset, but if it powers up low then the WATCHDOG
will time out and WDOUT will go high.
The Clock Monitor forces the G1 pin low upon detecting a clock frequency error. The
Clock Monitor error will continue until the clock frequency has reached the minimum
specified value, after which the G1 output will go high following 16 t
The Clock Monitor generates a continual Clock Monitor error if the oscillator fails to
start, or fails to reach the minimum specified frequency. The specification for the Clock
Monitor is as follows:
2.14.3 WATCHDOG and Clock Monitor Summary
The following salient points regarding the WATCHDOG and CLOCK MONITOR should
be noted:
Match
Don't Care Mismatch
Mismatch
Don't Care Don't Care
1/t
1/t
• Both the WATCHDOG and CLOCK MONITOR detector circuits are inhibited dur-
• Following RESET, the WATCHDOG and CLOCK MONITOR are both enabled,
• The WATCHDOG service window and CLOCK MONITOR enable/disable option
• The initial WATCHDOG service must match the key data value in the WATCH-
• Subsequent WATCHDOG services must match all three data fields in WDSVR in
Key Data
c
c
ing RESET.
with the WATCHDOG having he maximum service window selected.
can only be changed once, during the initial WATCHDOG service following RE-
SET.
DOG Service register WDSVR in order to avoid a WATCHDOG error.
order to avoid WATCHDOG errors.
> 10 kHz—No clock rejection.
< 10 Hz—Guaranteed clock rejection.
Match
Don't Care
Window Data
Match
Don't Care Error: Generate WATCHDOG Output
Don't Care Error: Generate WATCHDOG Output
Mismatch
Monitor
Clock
Valid Service: Restart Service Window
Error: Generate WATCHDOG Output
COP8SAx7 MICROCONTROLLER
Action
c
–32 t
c
clock cycles.
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