upd17072 Renesas Electronics Corporation., upd17072 Datasheet - Page 95
upd17072
Manufacturer Part Number
upd17072
Description
4-bit Single-chip Microcontroller With Hardware For Digital Tuning System
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD17072.pdf
(226 pages)
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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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