Cypress CY14B108M, CY14B108K manual Time-base, Write only. Reading it always returns a, Wie Aie Pfe

			PRELIMINARY			CY14B108K, CY14B108M
Table 5. Register Map Detail (continued)
Register					Description
CY14B108K	CY14B108M
0xFFFF8	0x7FFF8				Calibration/Control
		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
Sign		the time-base.
Calibration		These five bits control the calibration of the clock.
0xFFFF7	0x7FFF7				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. 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 more detail in 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

31.25ms (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.

0xFFFF6	0x7FFF6				Interrupt Status/Control
		D7	D6	D5		D4	D3	D2	D1		D0
		WIE	AIE	PFE		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.
PFE		Power Fail Enable. When set to 1, the power fail monitor 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.
0xFFFF5	0x7FFF5					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. 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 #: 001-47378 Rev. **										Page 13 of 29

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