Cypress CY14B256K manual Register Map Detail Calibration/Control 0X7FF8, 0x7FF7, Alarm Day 0x7FF5

										CY14B256K
Table 4. Register Map Detail (continued)
					Calibration/Control
0X7FF8	D7		D6	D5	D4	D3		D2		D1	D0
	OSCEN	0		Calibration				Calibration
				Sign
OSCEN	Oscillator Enable. When set to 1, the oscillator is stopped. When set to 0, the oscillator runs. Disabling the oscillator
	saves battery or capacitor power during storage.
Calibration	Determines if the calibration adjustment is applied as an addition (1) to or as a subtraction (0) from the time-base.
Sign
Calibration	These five bits control the calibration of the clock.
					WatchDog Timer
0x7FF7	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. 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 allows
	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 detail in the “Watchdog
	Timer” on page 8.
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
0x7FF6	D7		D6	D5	D4	D3		D2		D1	D0
	WIE	AIE		PFIE	0	H/L		P/L		0	0
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.
PFIE	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.
0	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
0x7FF5	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. 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.

Document Number: 001-06431 Rev. *H Page 13 of 28

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