PD17012_15 Datasheet, PDF (114/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
Figure 11-11. Configuration of Interrupt Edge Select Register
Name
Interrupt edge select
register
Flag symbol Address
b3 b2 b1 b0
000I
1FH
E
G
Read/
write
R/W
Sets input edge issuing interrupt request of INT pin
0 Rising edge
1 Falling edge
Fixed to 0
Power-on
Clock stop
CE
0000
0
0
Note that as soon as the interrupt request issuing edge is changed by the IEG flag, the interrupt request signal
may be issued.
Suppose that the IEG flag is set to 1 (specifying the falling edge) and that a high level is input to the INT pin, as
shown in Table 11-2. If the IEG flag is reset to 0 at this time, the edge detector judges that a rising edge has been
input, and issues an interrupt request.
Table 11-2. Issuing Interrupt Request by Changing IEG Flag
Changes in IEG Flag
1 →0
(falling)
(rising)
0 →1
(rising)
(falling)
INT Pin Status
Low level
High level
Low level
High level
Interrupt Request
Not issued
Issued
Issued
Not issued
IRQ Flag Status
Retains previous status
Set to 1
Set to 1
Retains previous status
112
Data Sheet U10101EJ4V0DS