(4) External interrupt rising edge enable register (EGP), external interrupt falling edge enable register (EGN)
These registers specify the valid edge for INTP0 to INTP7.
EGP and EGN are set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets these registers to 00H.
Figure 19-5. Format of External Interrupt Rising Edge Enable Register (EGP)
Address: FF48H
After reset: 00H
Symbol
7
EGP
EGP7
Address: FF49H
After reset: 00H
Symbol
7
EGN
EGN7
EGPn
0
0
1
1
Table 19-3 shows the ports corresponding to EGPn and EGNn.
Detection Enable Register
EGP0
EGP1
EGP2
EGP3
EGP4
EGP5
EGP6
EGP7
Caution Select the port mode by clearing EGPn and EGNn to 0 because an edge may be
detected when the external interrupt function is switched to the port function.
Remark n = 0 to 7
CHAPTER 19 INTERRUPT FUNCTIONS
and External Interrupt Falling Edge Enable Register (EGN)
R/W
6
5
4
EGP6
EGP5
EGP4
R/W
6
5
4
EGN6
EGN5
EGN4
EGNn
INTPn pin valid edge selection (n = 0 to 7)
0
Edge detection disabled
1
Falling edge
0
Rising edge
1
Both rising and falling edges
Table 19-3. Ports Corresponding to EGPn and EGNn
Edge Detection Port
EGN0
P120
EGN1
P30
EGN2
P31
EGN3
P32
EGN4
P33
EGN5
P16
EGN6
P140
EGN7
P141
Preliminary User's Manual U17260EJ3V1UD
3
2
1
EGP3
EGP2
EGP1
3
2
1
EGN3
EGN2
EGN1
Interrupt Request Signal
INTP0
INTP1
INTP2
INTP3
INTP4
INTP5
INTP6
INTP7
0
EGP0
0
EGN0
497