ZBasic System Library
209
ZBasic Microcontrollers
Type
Subroutine
Invocation
OpenWatchDog(timeout)
Parameter
Method
Type
Description
timeout
ByVal
Byte
Specifies a timeout value (see discussion).
Discussion
This subroutine prepares the watchdog timer for use. Once it is opened, the WatchDog() routine must
be called from time to time. If the period between WatchDog() calls exceeds the timeout value, the
system will be reset.
The approximate timeout value is T times 2 to the power N where T is the Timeout Base value and N is
the value of the timeout parameter limited to the range shown in the table below. Note that the timeout
value varies with processor voltage, being slightly longer at a lower operating voltage. Consult the Atmel
documentation for more specific information.
WatchDog Timeout Parameter Range For ZX Devices
ZX Devices
Timeout
Base
Value
Range
Max.
Time
ZX-24, ZX-40, ZX-44
16mS
0-7
2 sec
ZX-24a, ZX-40a, ZX-44a, ZX-24p, ZX-40p, ZX-44p,
ZX-24n, ZX-40n, ZX-44n, ZX-24r, ZX-40r, ZX-44r,
ZX-24s, ZX-24t, ZX-40s, ZX-44s, ZX-40t, ZX-44t
16mS
0-9
8 sec
ZX-24x, ZX-24u, ZX-32a4, ZX-128a1, ZX-24xu
8mS
0-10
8 sec
ZX-328n, ZX-328l, ZX-32n, ZX-32l, ZX-1281, ZX-1281n, ZX-1280, ZX-1280n
16mS
0-9
8 sec
ZX-24e, ZX-128e, ZX-128ne
16mS
0-7
2 sec
ZX-24ae, ZX-24ne, ZX-24pe, ZX-24nu, ZX-24pu,
ZX-24ru, ZX-24su, ZX-1281e, ZX-1281ne, ZX-328nu
16mS
0-9
8 sec
WatchDog Timeout Parameter Range For Generic Devices
Target Device
Timeout
Base
Value
Range
Max.
Time
tiny24, tiny24A, tiny44, tiny44A, tiny84, tiny84A, tiny441, tiny841, tiny48, tiny88,
tiny87, tiny167, tiny2313, tiny2313A, tiny4313, tiny828, tiny1634
16mS
0-9
8 sec
mega48, mega48A, mega48P, mega48PA, mega48PB, mega88, mega88A,
mega88P, mega88PA, mega88PB, mega168, mega168A, mega168P,
mega168PA, mega168PB, mega328, mega328P, mega328PB, mega164A,
mega164P, mega164PA, mega324P, mega324PA, mega644, mega644A,
mega644P, mega644PA, mega1284P
16mS
0-9
8 sec
mega8, mega8A, mega16, mega16A, mega32, mega32A, mega8515,
mega8535, mega162
16mS
0-7
2 sec
mega64, mega64A, mega128, mega128A
14mS
0-7
2 sec
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