Cypress STK17TA8 Manual De Usuario
STK17TA8
Document #: 001-52039 Rev. **
Page 18 of 23
Register Map Detail
0x1FFFF
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.
0x1FFFE
Real Time Clock – Months
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
10s Month
Months
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.
0x1FFFD
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.
0x1FFFC
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.
0x1FFFB
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.
0x1FFFA
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.
0x1FFF9
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.
0x1FFF8
Calibration
D7
D6
D5
D4
D3
D2
D1
D0
OSCEN
0
Calibration
Sign
Calibration
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 (1) to or as a subtraction (0) from the time-base.
Calibration
These five bits control the calibration of the clock.