Cypress STK17T88 manual Ordering Codes, 0x7FF0 Flags

									STK17T88
Register Map Detail (continued)
0x7FF0					Flags
	D7		D6	D5	D4	D3	D2	D1	D0
	WDF		AF	PF	OSCF	0	CAL	W	R
WDF	Watchdog	Timer Flag. This read-only bit is set to 1 when the watchdog timer is allowed to reach 0 without
	being reset by the user. It is cleared to 0 when the Flags register is read or on power up
AF	Alarm Flag. This read-only bit is set to 1 when the time and date match the values stored in the alarm
	registers with the match bits = 0. It is cleared when the Flags register is read or on power up
PF	Power-fail Flag. This read-only bit is set to 1 when power falls below the power-fail threshold VSWITCH. It
	is cleared to 0 when the Flags register is read or on power up.
OSCF	Oscillator Fail Flag. Set to 1 on power up only if the oscillator is enabled and not running in the first 5ms
	of operation. This indicates that the RTC backup power failed and the clock value is no longer valid. The
	user must reset this bit to 0 to clear this condition.
CAL	Calibration Mode. When set to 1, a 512Hz square wave is output on the INT pin. When set to 0, the INT
	pin resumes normal operation. This bit defaults to 0 (disabled) on power up.

WWrite Time. Setting the W bit to 1 freezes updates of the RTC registers. The user can then write to the RTC registers, Alarm registers, Calibration register, Interrupt register and Flags register. Setting the W bit to 0 disables writes to the registers and causes the contents of the real time clock registers to be transferred to the timekeeping counters if the time has changed (a new base time is loaded). The bit defaults to 0 on power up.

RRead Time. Setting the R bit to 1 captures the current time in holding registers so that clock updates are not during the reading process. Set the R bit to 0 to enable the holding register to resume clock updates. The bit defaults to 0 on power up.

Commercial and Industrial Ordering Information

STK17T88 - R F 45 I TR

Packaging Option:

TR = Tape and Reel

Blank = Tube

Temperature Range:

C - Commercial (0 to 70°C)

I - Industrial (-40 to 85°C)

Lead Finish

F = 100% Sn (Matte Tin) RoHS Compliant

Package:

R = Plastic 48-pin 330 mil SSOP

Ordering Codes

Speed:

25 - 25 ns

45 - 45 ns

Ordering Code	Description	Access Times (ns)	Temperature
STK17T88-RF25	3.3V 32Kx8 AutoStore nvSRAM+RTC SSOP48-300	25	Commercial
STK17T88-RF45	3.3V 32Kx8 AutoStore nvSRAM+RTC SSOP48-300	45	Commercial
STK17T88-RF25TR	3.3V 32Kx8 AutoStore nvSRAM+RTC SSOP48-300	25	Commercial
STK17T88-RF45TR	3.3V 32Kx8 AutoStore nvSRAM+RTC SSOP48-300	45	Commercial
STK17T88-RF25I	3.3V 32Kx8 AutoStore nvSRAM+RTC SSOP48-300	25	Industrial
STK17T88-RF45I	3.3V 32Kx8 AutoStore nvSRAM+RTC SSOP48-300	45	Industrial
STK17T88-RF25ITR	3.3V 32Kx8 AutoStore nvSRAM+RTC SSOP48-300	25	Industrial
STK17T88-RF45ITR	3.3V 32Kx8 AutoStore nvSRAM+RTC SSOP48-300	45	Industrial
Document Number: 001-52040 Rev. *A			Page 20 of 22

[+] Feedback