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PRELIMINARY
CY14B256K
Document Number: 001-06431 Rev. *E
Page 9 of 23
Table 3. RTC Register Map
Register
BCD Format Data
Function/Range
D7
D6
D5
D4
D3
D2
D1
D0
0x7FFF
10s Years
Years
Years: 00–99
0x7FFE
0
0
0
10s
Months
Months
Months: 01–12
0x7FFD
0
0
10s Day of Month
Day Of Month
Day of Month: 01–31
0x7FFC
0
0
0
0
0
Day of week
Day of week: 01–07
0x7FFB
0
0
10s Hours
Hours
Hours: 00–23
0x7FFA
0
10s Minutes
Minutes
Minutes: 00–59
0x7FF9
10s Seconds
Seconds
Seconds: 00–59
0x7FF8 OSCEN
0
Cal Sign
Calibration
Calibration Values [4]
0x7FF7
WDS
WDW
WDT
Watchdog [4]
0x7FF6
WIE
AIE
PFE
0
H/L
P/L
0
0
Interrupts [4]
0x7FF5
M
0
10s Alarm Date
Alarm Day
Alarm, Day of Month: 01–31
0x7FF4
M
0
10s Alarm Hours
Alarm Hours
Alarm, Hours: 00–23
0x7FF3
M
10 Alarm Minutes
Alarm Minutes
Alarm, Minutes: 00–59
0x7FF2
M
10 Alarm Minutes
Alarm, Seconds
Alarm, Seconds: 00–59
0x7FF1
10s Centuries
Centuries
Centuries: 00–99
0x7FF0
WDF
AF
PF
OSCF
0
CAL
W
R
Flags [4]
Table 4. Register Map Detail
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 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
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 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 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
Time Keeping - 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.
Note:
4. Is a binary value, not a BCD value.
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