
RS5C372A/B
22
2.4 Day-of-the-week Counter (at internal address 3h)
D7
D6
D5
D4
D3
D2
D1
D0
—
W4
W2
W1
0
W4
W2
W1
0
Undefined Undefined Undefined
(For write operation)
(For read operation)
Default*
*) The default means read value when XSTP bit is set to “1” by starting up from 0V, or supply voltage drop, etc.
Day-of-the-week digits are incremented by 1 when carried to 1-day digits.
Day-of-the-week digits display (incremented in septimal notation):
(W4, W2, W1)=(0,0,0)
→(0,0,1)→ .... →(1,1,0)→(0,0,0)
The relation between days of the week and day-of-the-week digits is user changeable (e.g. Sunday=0,0,0).
The (W4, W2, W1) should not be set to (1, 1, 1).
2.5 Calendar Counter (at internal address 4 to 6h)
The automatic calendar function provides the following calendar digit displays in BCD code.
Day digits
: Range from 1 to 31 (for January, March, May, July, August, October, and December).
Range from 1 to 30 (for April, June, September, and November).
Range from 1 to 29 (for February in leap years).
Range from 1 to 28 (for February in ordinary years).
Carried to month digits when cycled to 1.
Month digits : Range from 1 to 12 and carried to year digits when cycled to 1.
Year digits
: Range from 00 to 99 and 00, 04, 08,..., 92, and 96 are counted as leap years.
Any registered imaginary time should be replaced with correct time as carrying to such registered imaginary time
digits from lower-order ones cause the clock counter malfunction.
2.5-1 Day digit register (at internal address 4h)
D7
D6
D5
D4
D3
D2
D1
D0
—
D20
D10
D8
D4
D2
D1
0
D20
D10
D8
D4
D2
D1
0
Undefined Undefined Undefined Undefined Undefined Undefined
(For write operation)
(For read operation)
Default*
2.5-2 Month digit register (at internal address 5h)
D7
D6
D5
D4
D3
D2
D1
D0
—
MO10
MO8
MO4
MO2
MO1
0
MO10
MO8
MO4
MO2
MO1
0
Undefined Undefined Undefined Undefined Undefined
(For write operation)
(For read operation)
Default*