ST92F150-EVAL STMicroelectronics, ST92F150-EVAL Datasheet - Page 160

• Manufacturer Part Number: ST92F150-EVAL
• Description: BOARD EVALUATION FOR ST9 SERIES
• Manufacturer: STMicroelectronics

Specifications of ST92F150-EVAL

• Processor To Be Evaluated: ST90158 and ST92F1x Daughter Board
• Interface Type: I2C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-2905

TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont’d)
10.1.3.3 Preventing Watchdog System Reset
In order to prevent a system reset, the sequence
AAh, 55h must be written to WDTLR (Watchdog
Timer Low Register). Once 55h has been written,
the Timer reloads the constant and counting re-
starts from the preset value.
To reload the counter, the two writing operations
must be performed sequentially without inserting
other instructions that modify the value of the
WDTLR register between the writing operations.
The maximum allowed time between two reloads
of the counter depends on the Watchdog timeout
period.
Figure 88. Watchdog Timer Mode
160/429
9
COUNT
VALUE
WRITE WDTRH,WDTRL
COUNT RELOAD
PRODUCE
WRITE AAh,55h
INTO WDTRL
WD EN=0
G
TIMER START COUNTING
10.1.3.4 Non-Stop Operation
In Watchdog Mode, a Halt instruction is regarded
as illegal. Execution of the Halt instruction stops
further execution by the CPU and interrupt ac-
knowledgment, but does not stop INTCLK, CPU-
CLK or the Watchdog Timer, which will cause a
System Reset when the End of Count condition is
reached. Furthermore, ST_SP, S_C and the Input
Mode selection bits are ignored. Hence, regard-
less of their status, the counter always runs in
Continuous Mode, driven by the internal clock.
The Output mode should not be enabled, since in
this context it is meaningless.
(E.G. INFINITE LOOP)
OR PERIPHERAL FAIL
SOFTWARE FAIL
VA00220
RESET