CY28344
Data Byte 8 (continued)
Power On
Default
Bit
Bit 5
Pin#
--
Name
WD_TIMER4
Pin Description
These bits store the time-out value of the Watchdog timer.
The scale of the timer is determine by the pre-scaler. The
timer can support values from 150 ms – 4.8 sec when the
pre-scaler is set to 150 ms. If the pre-scaler is set to 2.5
sec, it can support a value from 2.5 – 80 seconds. When
the Watchdog timer reaches “0”, it will set the
WD_TO_STATUS bit and generate Reset if RST_EN_WD
is enabled.
1
1
1
1
1
Bit 4
Bit 3
Bit 2
Bit 1
--
WD_TIMER3
WD_TIMER2
WD_TIMER1
WD_TIMER0
--
--
--
Bit 0
--
WD_PRE_SCALER
0 = 150 ms
1 = 2.5 sec
0
Data Byte 9
Power On
Default
Bit
Pin#
Name
Pin Description
Bit 7
--
48MHz_DRV
48MHz and 24_48MHz clock output drive strength
0 = Normal
1 = High Drive
0
0
0
0
Bit 6
Bit 5
Bit 4
--
--
--
PCI_DRV
PCI clock output drive strength
0 = Normal
1 = High Drive
3V66_DRV
RST_EN_WD
3V66 clock output drive strength
0 = Normal
1 = High Drive
This bit will enable the generation of a Reset pulse when a
Watchdog timer time-out occurs.
0 = Disabled
1 = Enabled
Bit 3
Bit 2
Bit 1
--
--
--
RST_EN_FC
WD_TO_STATUS
WD_EN
This bit will enable the generation of a Reset pulse after a
0
0
0
frequency change occurs.
0 = Disabled
1 = Enabled
Watchdog Timer Time-out Status bit
0 = No time-out occurs (Read); Ignore (Write)
1 = time-out occurred (Read); Clear WD_TO_STATUS
(Write)
0 = Stop and re-load Watchdog timer
1 = Enable Watchdog timer. It will start counting down after
a frequency change occurs. Note: CY28344 will generate
system reset, reload a recovery frequency, and lock itself
into a recovery frequency mode after a Watchdog timer
time-out occurs. Under recovery frequency mode,
CY28344 will not respond to any attempt to change output
frequency via the SMBus control bytes. System software
can unlock CY28344 from its recovery frequency mode by
clearing the WD_EN bit.
Bit 0
--
Reserved
Reserved
0
Rev 1.0,November 21, 2006
Page 8 of 21
SPECTRALINEAR [ SPECTRALINEAR INC ]
