Document Number: 001-55720 Rev. *H Page 13 of 28
Table 4. Register Map Detail
Register
Description
CY14B256KA
0x7FFF
Time Keeping - Years
D7 D6 D5 D4 D3 D2 D1 D0
10s years Years
Contains the lower two BCD digits of the year. Lower nibble (four bits) contains the value for years; upper nibble
(four bits) contains the value for 10s of years. Each nibble operates from 0 to 9. The range for the register is 0–99.
0x7FFE
Time Keeping - Months
D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 10s month Months
Contains the BCD digits of the month. Lower nibble (four bits) 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
Time Keeping - 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 (four bits) contains the lower digit and operates
from 0 to 9; upper nibble (two bits) contains the 10s digit and operates from 0 to 3. The range for the register is
1–31. Leap years are automatically adjusted for.
0x7FFC
Time Keeping - Day
D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 Day of week
Lower nibble (three bits) 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, because the day is not
integrated with the date.
0x7FFB
Time Keeping - 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 (four bits) 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
Time Keeping - Minutes
D7 D6 D5 D4 D3 D2 D1 D0
0 10s minutes Minutes
Contains the BCD value of minutes. Lower nibble (four bits) contains the lower digit and operates from 0 to 9;
upper nibble (three bits) contains the upper minutes digit and operates from 0 to 5. The range for the register is
0–59.
0x7FF9
Time Keeping - Seconds
D7 D6 D5 D4 D3 D2 D1 D0
0 10s seconds Seconds
Contains the BCD value of seconds. Lower nibble (four bits) contains the lower digit and operates from 0 to 9;
upper nibble (three bits) contains the upper digit and operates from 0 to 5. The range for the register is 0–59.
(24 strony)
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