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RX - 4803 SA / LC
8.2.3. Alarm registers
Address
8
MIN Alarm
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.
8.2.4. Fixed-cycle timer control registers
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.
8.2.5. Extension register
Address
Extension Register
D
∗1)
The default value is the value that is read (or is set internally) after powering up from 0 V.
∗2)
"o" indicates write-protected bits. A zero is always read from these bits.
∗3)
"−" indicates a default value is undefined.
• This register is used to specify the target for the alarm function or time update interrupt function and to select or
set operations such as fixed-cycle timer operations.
1) TEST bit
This is the manufacturer's test bit. Its value should always be "0".
Be careful to avoid writing a "1" to this bit when writing to other bits.
TEST
Write/Read
2) WADA ( Week Alarm/Day Alarm ) bit
This bit is used to specify either WEEK or DAY as the target of the alarm interrupt function.
Writing a "1" to this bit specifies DAY as the comparison obLCct for the alarm interrupt function.
Writing a "0" to this bit specifies WEEK as the comparison obLCct for the alarm interrupt function.
3) USEL ( Update Interrupt Select ) bit
This bit is used to specify either "second update" or "minute update" as the update generation timing of the
time update interrupt function.
USEL
Write/Read
4) TE ( Timer Enable ) bit
This bit controls the start/stop setting for the fixed-cycle timer interrupt function.
Writing a "1" to this bit specifies starting of the fixed-cycle timer interrupt function (a countdown starts from a
preset value).
Writing a "0" to this bit specifies stopping of the fixed-cycle timer interrupt function.
Function
bit 7
AE
AE
AE
Function
bit 7
128
•
Function
bit 7
TEST
(Default)
(0)
Data
0
Normal operation mode
1
Setting prohibited (manufacturer's test bit)
Data
update interrupts
0
second update
1
minute update
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
•
•
•
bit 6
bit 5
bit 4
WADA
USEL
TE
(−)
(−)
(−)
Description
Auto reset time
∗ Default
500 ms
7.813 ms
Page - 10
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
bit 3
bit 2
bit 1
FSEL1
FSEL0
TSEL1
(0)
(0)
(−)
t
RTN
ETM33E-04
bit 0
1
1
0
1
bit 0
1
256
bit 0
TSEL0
(−)
∗ Default
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