Register Map Detail, Alarm Day, Alarm Hours

PRELIMINARY

CY14B101P

Table 10. Register Map Detail (continued)

WatchDog Timer

0x07

WDS

WDW

WDT

WDS

Watchdog Strobe. Setting this bit to 1 reloads and restarts the watchdog timer. Setting the bit to 0 has no effect. The bit

is cleared automatically after the watchdog timer is reset. The WDS bit is write only. Reading it always returns a 0.

WDW

Watchdog Write Enable. Setting this bit to 1 disables any WRITE to the watchdog timeout value (D5–D0). This enables

the user to set the watchdog strobe bit without disturbing the timeout value. Setting this bit to 0 allows bits D5–D0 to

be written to the watchdog register when the next write cycle is complete. This function is explained in more detail in

Watchdog Timer on page 15.

WDT

Watchdog timeout 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 of timeout value is 31.25 ms (a setting of 1) to 2 seconds (setting

of 3 Fh). Setting the watchdog timer register to 0 disables the timer. These bits can be written only if the WDW bit was

set to 0 on a previous cycle.

Interrupt Status/Control

0x06

WIE

AIE

PFE

H/L

P/L

WIE

Watchdog Interrupt Enable. When set to 1 and a watchdog timeout occurs, the watchdog timer drives the INT pin and

the WDF flag. When set to 0, the watchdog timeout affects only the WDF flag.

AIE

Alarm Interrupt Enable. When set to 1, the alarm match drives the INT pin and the AF flag. When set to 0, the alarm

match only affects the AF flag.

PFE

Power Fail Enable. When set to 1, the alarm match drives the INT pin and the PF flag. When set to 0, the power fail

monitor affects only the PF flag.

Reserved for future use

H/L

HIGH/LOW. When set to 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 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.

Alarm - Day

0x05

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.

Match. When this bit is set to 0, the date value is used in the alarm match. Setting this bit to 1 causes the match circuit

to ignore the date value.

Alarm - Hours

0x04

10s Alarm Hours

Alarm Hours

Contains the

alarm value for the hours and the mask bit to

select or deselect the hours value.

Match. When this bit is set to 0, the hours value is used in the alarm match. Setting this bit to 1 causes the match circuit

to ignore the hours value.

Alarm - Minutes

0x03

10s Alarm Minutes

Alarm Minutes

Contains the

alarm value for the minutes and the mask bit to select or deselect the minutes value.

Match. When this bit is set to 0, the minutes value is used in the alarm match. Setting this bit to 1 causes the match

circuit to ignore the minutes value.

Document #: 001-44109 Rev. *B

Page 20 of 32

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