UPD17073 NEC, UPD17073 Datasheet - Page 95

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UPD17073

Manufacturer Part Number
UPD17073
Description
4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
Manufacturer
NEC
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
UPD17073GB-572-1A7-A
Manufacturer:
RENESAS
Quantity:
16 435
Internal
pulse A
Internal
pulse B
Basic timer 1
interrupt pulse
IRQBTM1 flag
IPBTM1 flag
INTE FF
Basic timer 1
interrupt pulse
IRQBTM1 flag
IPBTM1 flag
INTE FF
(b) When basic timer 1 interrupt pulse is changed
(c) When IRQBTM1 flag is manipulated
Even if the basic timer 1 interrupt pulse is changed to B at point <1> in the above figure, the interrupt is
accepted at the next point <2> because the basic timer 1 interrupt pulse does not fall.
If the basic timer 1 interrupt pulse is changed to A at <3>, the interrupt is immediately accepted because
the basic timer 1 interrupt pulse falls.
The interrupt is immediately accepted if the IRQBTM1 flag is set to 1 at <1>.
If clearing the IRQBTM1 flag to 0 overlaps with the falling of the basic timer 1 interrupt pulse at <2>, the
interrupt is not accepted.
DI
EI
H
H
H
DI
EI
L
L
L
1
0
1
0
H
L
1
0
1
0
Interrupt accepted
Interrupt accepted
Figure 12-9. Error of Basic Timer 1 (2/2)
EI
EI
<1> Basic timer 1 interrupt
pulse changed
<1> SET1 IRQBTM1
Interrupt accepted
EI
<2> Interrupt accepted
EI
<2> CLR1 IRQBTM1
Interrupt not accepted
EI
<3> Basic timer 1 interrupt
pulse changed
PD17072,17073
Interrupt accepted
Interrupt accepted
EI
EI
95

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