C8051F320-TB Silicon Laboratories Inc, C8051F320-TB Datasheet - Page 238
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C8051F320-TB
Manufacturer Part Number
C8051F320-TB
Description
BOARD PROTOTYPING W/C8051F320
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F320-TB
Contents
Board
Processor To Be Evaluated
C8051F320/F321
Interface Type
USB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F320
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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C8051F320/1
Note that the 8-bit offset held in PCA0CPH4 is compared to the upper byte of the 16-bit PCA counter. This
offset value is the number of PCA0L overflows before a reset. Up to 256 PCA clocks may pass before the
first PCA0L overflow occurs, depending on the value of the PCA0L when the update is performed. The
total offset is then given (in PCA clocks) by Equation 20.4, where PCA0L is the value of the PCA0L register
at the time of the update.
The WDT reset is generated when PCA0L overflows while there is a match between PCA0CPH4 and
PCA0H. Software may force a WDT reset by writing a ‘1’ to the CCF4 flag (PCA0CN.4) while the WDT is
enabled.
20.3.2. Watchdog Timer Usage
To configure the WDT, perform the following tasks:
The PCA clock source and Idle mode select cannot be changed while the WDT is enabled. The watchdog
timer is enabled by setting the WDTE or WDLCK bits in the PCA0MD register. When WDLCK is set, the
WDT cannot be disabled until the next system reset. If WDLCK is not set, the WDT is disabled by clearing
the WDTE bit.
The WDT is enabled following any reset. The PCA0 counter clock defaults to the system clock divided by
12, PCA0L defaults to 0x00, and PCA0CPL4 defaults to 0x00. Using Equation 20.4, this results in a WDT
timeout interval of 256 PCA clock cycles (3072 system clock cycles). Table 20.3 lists some example time-
out intervals for typical system clocks.
238
1. Disable the WDT by writing a ‘0’ to the WDTE bit.
2. Select the desired PCA clock source (with the CPS2-CPS0 bits).
3. Load PCA0CPL4 with the desired WDT update offset value.
4. Configure the PCA Idle mode (set CIDL if the WDT should be suspended while the CPU is in
5. Enable the WDT by setting the WDTE bit to ‘1’.
6. (optional) Lock the WDT (prevent WDT disable until the next system reset) by setting the
7. Write a value to PCA0CPH4 to reload the WDT.
Idle mode).
WDLCK bit to ‘1’.
Equation 20.4. Watchdog Timer Offset in PCA Clocks
Offset
=
256 PCA0CPL4
Rev. 1.4
+
256 PCA0L
–
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