RX
−
8564
LC
Page
−
16
ETM12E-01
13.1.6. Alarm registers
(
Reg
−
09
[h]
to
0C
[h]
)
Address
[h]
Function
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
09
Minute Alarm
AE
40
20
10
8
4
2
1
0A
Hour Alarm
AE
×
20
10
8
4
2
1
0B
Day Alarm
AE
×
20
10
8
4
2
1
0C
Weekday Alarm
AE
×
×
×
×
4
2
1
•
The AIE bit and AF bit can both be set or used when using alarm interrupt function to set interrupt events for dates,
days, hours, minutes, etc.
•
When the current time matches the settings in the above alarm registers, the AF bit's value is "1" and the /INT
pin's status is low to indicate that an alarm interrupt event has occurred.
∗
For details, see "9.3. Alarm Interrupt Function".
13.1.7. Timer setting register
(
Reg
−
0E
[h]
)
Address
[h]
Function
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
0E
Timer control
TE
×
×
×
×
×
TD1
TD0
•
This register is used to control the fixed-cycle timer interrupt function.
•
To use the fixed-cycle timer interrupt function, the TI/TP bits
(Reg
−
01
[h]),
timer register (Reg
−
0F
[h]),
and the
TF and TIE bits are all set or used.
1) TE bit
(
Timer Enable
)
This bit is used to control operation of the fixed-cycle timer interrupt function.
When "1"
is written to this bit, the fixed-cycle timer interrupt function starts operating.
When "0"
is written to this bit, the fixed-cycle timer interrupt function stops operating.
∗
For details, see "9.2. Fixed-cycle Timer Interrupt Function ".
2) TD1,TD0 bits
(
Timer countDown interval select 1,
0
)
These bits specify the fixed-cycle timer interrupt function's countdown period
(source clock).
Four different periods can be selected via combinations of these two bit values.
∗
For details, see "9.2. Fixed-cycle Timer Interrupt Function ".
13.1.8. Down counter for fixed-cycle timer
(
Reg
−
0F
[h]
)
Address
[h]
Function
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
0F
Timer
128
64
32
16
8
4
2
1
•
This register is used to set the default (preset) value for the counter. Any count value from 1
(01
h)
to
255
(FFh)
can be set
•
To use the fixed-cycle timer interrupt function, the TE,
TI/TP,
TF,
TIE,
TD1,
and TD0 bits are set and used.
•
When this down counter's count value changes from 01h to 00h, when TF bit
=
"1",
or when the /INT pin is at low
level ("L"), it indicates that a fixed-cycle timer interrupt event has occurred.
•
The current countdown status can be checked by reading this register.
∗
However, since the read data is not held (the data may be changing), to obtain accurate data the countdown
status should be read twice and then compared.
∗
For details, see "9.2. Fixed-cycle Timer Interrupt Function ".
