Cypress CY14B108K Specification Sheet page 12

Table 5. Register Map Detail
Register
CY14B108K CY14B108M
0xFFFFF 0x7FFFF
0xFFFFE 0x7FFFE
0xFFFFD 0x7FFFD
0xFFFFC 0x7FFFC
0xFFFFB 0x7FFFB
0xFFFFA 0x7FFFA
0xFFFF9 0x7FFF9
Document #: 001-47378 Rev. **
PRELIMINARY
D7 D6 D5
10s 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.
D7 D6 D5
0 0 0
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.
D7 D6 D5
0 0 10s 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.
D7 D6 D5
0 0 0
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.
D7 D6 D5
0 0
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.
D7 D6 D5
0 10s 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.
D7 D6 D5
0 10s 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 to 59.
CY14B108K, CY14B108M
Description
Time Keeping - Years
D4 D3
Time Keeping - Months
D4 D3
10s Month
Time Keeping - Date
D4 D3
Time Keeping - Day
D4 D3
0 0
Time Keeping - Hours
D4 D3
10s Hours
Time Keeping - Minutes
D4 D3
Time Keeping - Seconds
D4 D3
D2 D1 D0
Years
D2 D1 D0
Months
D2 D1 D0
Day of Month
D2 D1 D0
Day of Week
D2 D1 D0
Hours
D2 D1 D0
Minutes
D2 D1 D0
Seconds
Page 12 of 29
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