Document Number: 001-52040 Rev. *C Page 20 of 24
0x7FF7
Watchdog Timer
D7 D6 D5 D4 D3 D2 D1 D0
WDS WDW WDT
WDS Watchdog Strobe. Setting this bit to ‘1’ reloads and restarts the watchdog timer. The bit is cleared automat-
ically when the watchdog timer is reset. The WDS bit is write only. Reading it always returns a ‘0’.
WDW Watchdog Write Enable. Set this bit to ‘1’ to disable writing of the watchdog time-out value (WDT5-WDT0).
This allows to strobe the watchdog without disturbing the time-out value. Setting this bit to ‘0’ allows bits
5-0 to be written.
WDT Watchdog time-out selection. The watchdog timer interval is selected by the 6-bit value in this register. It
represents a multiplier of the 32 Hz count (31.25 ms). The range or time-out values is 31.25 ms (a setting
of ‘1’) to 2 seconds (setting of 3Fh). Setting the watchdog timer register to ‘0’ disables the timer. These bits
can be written only if the WDW bit was cleared to ‘0’ on a previous cycle.
0x7FF6
Interrupt
D7 D6 D5 D4 D3 D2 D1 D0
WIE AIE PFIE ABE H/L P/L 0 0
WIE Watchdog Interrupt Enable. When set to ‘1’ and a watchdog time-out occurs, the watchdog timer drives the
INT pin and sets the WDF flag. When set to ‘0’, the watchdog time-out only sets the WDF flag.
AIE Alarm Interrupt Enable. When set to ‘1’, the alarm match drives the INT pin and sets the AF flag. When set
to ‘0’, the alarm match only sets the AF flag.
PFIE Power-Fail Enable. When set to ‘1’, a power failure drives the INT pin and sets the PF flag. When set to ‘0’,
a power failure only sets the PF flag.
0 Reserved for Future Use
H/L High/Low. When set to a ‘1’, the INT pin is driven active high. When set to ‘0’, the INT pin is open drain,
active low.
P/L Pulse/Level. When set to a ‘1’, the INT pin is driven active (determined by H/L) by an interrupt source for
approximately 200 ms. When set to ‘0’, the INT pin is driven to an active level (as set by H/L) until the Flags
register is read.
0x7FF5
Alarm – Day
D7 D6 D5 D4 D3 D2 D1 D0
M 0 10s Alarm Date Alarm Date
Contains the alarm value for the date of the month and the mask bit to select or deselect the date value.
M Match. Setting this bit to ‘0’ causes the date value to be used in the alarm match. Setting this bit to ‘1’ causes
the match circuit to ignore the date value.
0x7FF4
Alarm – Hours
D7 D6 D5 D4 D3 D2 D1 D0
M 0 10s Alarm Hours Alarm Hours
Contains the alarm value for the hours and the mask bit to select or deselect the hours value.
M Match. Setting this bit to ‘0’ causes the hours value to be used in the alarm match. Setting this bit to ‘1’
causes the match circuit to ignore the hours value.
0x7FF3
Alarm – Minutes
D7 D6 D5 D4 D3 D2 D1 D0
M 10s Alarm Minutes Alarm Minutes
Contains the alarm value for the minutes and the mask bit to select or deselect the minutes value.
M Match. Setting this bit to ‘0’ causes the minutes value to be used in the alarm match. Setting this bit to ‘1’
causes the match circuit to ignore the minutes value.
Register Map Detail (continued)
Not Recommended for New Designs
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