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RX8900 SA / CE
8.6. About the interrupt function for operation /INT="L" interrupt output.
1)
How to identify events when the interrupt output occurred.
/INT output pin is common output terminal of interrupt events of three types (Fixed-cycle timer Time interrupt , alarm
interrupt, time update interrupt).
When an interrupt occurs, please read the TF, AF, UF flag to confirm which types of events occured.
2) Processing method when not using an interrupt output.
1. Please be open to interrupt pin.
2. Please set to "0" TIE, AIE, and UIE bit.
8.7. Temperature compensation function .
8.7.1. Temperature compensation function
Frequency compensation value for the oscillation circuit which matched with a value of a built-in temperature
sensor by a shipment inspection process of our company is set by built-in memory. Oscillation frequency for a
temperature change is compensated.
This function cannot stop with the high operation voltage than temperature compensation operation voltage
(VTEM).
8.7.2. Related registers for temperature compensation function
Address [h]
0F,1F
Control Register
1) CSEL1, CSEL0 bit(Compensation Interval Select 1,0)
This bit sets an interval of a temperature compensation operation.
Consumption electric currents decrease by setting an operation interval of a temperature compensation
circuit for a long time.
CSEL1,0 is set at the time of initial power supply injection by ("0","1") .
CSEL1
0
0
1
1
Even if the power supply voltage falls than VTEM and a VDET bit is set to "1", a temperature compensation operation is
performed afterwards when rose up the power supply voltage than VETM.
Function
bit 7
CSEL1
CSEL0
CSEL0
Compensation Interval
0
0.5 s
1
2.0 s
0
1
bit 6
bit 5
bit 4
UIE
TIE
10 s
30 s
Page - 23
bit 3
bit 2
bit 1
AIE
ETM45E-01
bit 0
RESET
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