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RX - 8581 SA
JE
/
8.2.8. Calendar counter (Reg 4 to 6)
Address
4
5
6
)
"o" indicates write-protected bits. A zero is always read from these bits.
The auto calendar function updates all dates, months, and years from January 1, 2001 to December 31, 2099.
The data format is BCD format. For example, a date register value of "0011 0001" indicates the 31st.
Note with caution that writing non-existent date data may interfere with normal operation of the calendar counter.
1) Date counter
Address
4
The updating of dates by the date counter varies according to the month setting.
A leap year is set whenever the year value is a multiple of four (such as 04, 08, 12, 88, 92, or 96). In
February of a leap year, the counter counts dates from "01," "02," "03," to "28," "29," "01," etc.
2) Month counter
Address
5
The month counter counts from 01 (January), 02 (February), and up to 12 (December), then starts again
at 01 (January).
3) Year counter
Address
6
The year counter counts from 00, 01, 02 and up to 99, then starts again at 00.
Any year that is a multiple of four (04, 08, 12, 88, 92, 96, etc.) is handled as a leap year.
8.2.9. Alarm registers (Reg - 8
Address
8
9
HOUR Alarm
WEEK Alarm
A
DAY Alarm
The alarm interrupt function is used, along with the AEI, AF, and WADA bits, to set alarms for specified date, day,
hour, and minute values.
When the settings in the above alarm registers and the WADA bit match the current time, the /INT pin goes to low
level and "1" is set to the AF bit to report that and alarm interrupt event has occurred.
For details, see "8.5. Alarm Interrupt Function".
8.2.10. Fixed-cycle timer control registers (Reg - B
Address
B
Timer Counter 0
C
Timer Counter 1
These registers are used to set the preset countdown value for the fixed-cycle timer interrupt function.
The TE, TF, TIE, and TSEL0/1 bits are also used to set the fixed-cycle timer interrupt function.
When the value in the above fixed-cycle timer control register changes from 001h to 000h, the /INT pin goes to
low level and "1" is set to the TF bit to report that a fixed-cycle timer interrupt event has occurred.
For details, see "8.3. Fixed-cycle Timer Interrupt Function".
NB
/
Function
bit 7
DAY
!
MONTH
!
YEAR
80
Function
bit 7
!
DAY
DAY
1, 3, 5, 7, 8, 10, or 12
4, 6, 9, or 11
Write/Read
February in normal year
February in leap year
Function
bit 7
MONTH
!
Function
bit 7
Years
Y80
A)
Function
bit 7
MIN Alarm
AE
AE
AE
C)
Function
bit 7
128
bit 6
bit 5
bit 4
!
20
10
!
!
10
40
20
10
bit 6
bit 5
bit 4
!
20
10
Month
bit 6
bit 5
bit 4
!
!
10
bit 6
bit 5
bit 4
Y40
Y20
Y10
bit 6
bit 5
bit 4
40
20
10
20
10
6
5
4
20
10
bit 6
bit 5
bit 4
64
32
16
Page - 12
bit 3
bit 2
bit 1
8
4
2
8
4
2
8
4
2
bit 3
bit 2
bit 1
8
4
2
Date update pattern
01, 02, 03
30, 31, 01
01, 02, 03
30, 01, 02
01, 02, 03
28, 01, 02
01, 02, 03
28, 29, 01
bit 3
bit 2
bit 1
8
4
2
bit 3
bit 2
bit 1
Y8
Y4
Y2
bit 3
bit 2
bit 1
8
4
2
8
4
2
3
2
1
8
4
2
bit 3
bit 2
bit 1
8
4
2
2048
1024
512
MQ372-02
bit 0
1
1
1
bit 0
1
bit 0
1
bit 0
Y1
bit 0
1
1
0
1
bit 0
1
256
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