Epson RX-8564LC - Manual (Page 19)

RX
−
8564 LC
Page
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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
Ч Ч Ч Ч
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 Ч Ч Ч Ч Ч 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 ".