Cypress STK17T88 manual Register Map Detail

STK17T88

Register Map Detail

	0x7FFF					Real Time Clock – Years
		D7		D6	D5	D4	D3	D2		D1	D0
				10s	Years					Years
		Contains the lower two BCD digits of the year. Lower nibble contains the value for years; upper nibble
		contains the value for 10s of years. Each nibble operates from 0 to 9. The range for the register is 0-99.
	0x7FFE					Real Time Clock – Months
		D7		D6	D5	D4	D3	D2		D1	D0
		0		0	0	10s			Months
						Month
		Contains the BCD digits of the month. Lower nibble contains the lower digit and operates from 0 to 9; upper
		nibble (one bit) contains the upper digit and operates from 0 to 1. The range for the register is 1-12.
	0x7FFD					Real Time Clock – Date
		D7		D6	D5	D4	D3	D2		D1	D0
		0		0	10s Day	of month		Day		of month
		Contains the BCD digits for the date of the month. Lower nibble contains the lower digit and operates from
		0 to 9; upper nibble contains the upper digit and operates from 0 to 3. The range for the register is 1-31.
		Leap years are automatically adjusted for.
	0x7FFC					Real Time Clock – Day
		D7		D6	D5	D4	D3	D2		D1	D0
		0		0	0	0	0			Day of week
		Lower nibble	contains a		value that	correlates to day of the week. Day of the week is a ring counter that
		counts from 1 to 7 then returns to 1. The user must assign meaning to the day value, as the day is not
		integrated with the date.
	0x7FFB					Real Time Clock – Hours
		D7		D6	D5	D4	D3	D2		D1	D0
		0		0	10s	Hours				Hours
		Contains the BCD value of hours in 24 hour format. Lower nibble contains the lower digit and operates
		from 0 to 9; upper nibble (two bits) contains the upper digit and operates from 0 to 2. The range for the
		register is 0-23.
	0x7FFA					Real Time Clock – Minutes
		D7		D6	D5	D4	D3	D2		D1	D0
		0			10s Minutes				Minutes
		Contains the BCD value of minutes. Lower nibble contains the lower digit and operates from 0 to 9; upper
		nibble contains the upper minutes digit and operates from 0 to 5. The range for the register is 0-59.
	0x7FF9					Real Time Clock – Seconds
		D7		D6	D5	D4	D3	D2		D1	D0
		0			10s Seconds				Seconds
		Contains the BCD value of seconds. Lower nibble contains the lower digit and operates from 0 to 9; upper
		nibble contains the upper digit and operates from 0 to 5. The range for the register is 0-59.
	0x7FF8					Calibration
		D7		D6	D5	D4	D3	D2		D1	D0
		OSCEN		0	Calibratio			Calibration
					n Sign
	OSCEN	Oscillator	Enable. When		set to 1, the oscillator is disabled. When set to 0, the oscillator is enabled.
		Disabling the oscillator saves battery/capacitor power during storage.
	Calibration Sign	Determines if the calibration adjustment is applied as an addition to or as a subtraction from the time-base.
	Calibration	These five bits control the calibration of the clock.
	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 once the watchdog timer is reset. The WDS bit is write only. Reading it always will return a 0.
Document Number: 001-52040 Rev. *A										Page 18 of 22

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