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Chapter 25 External Interrupt
3.Configuration
3. Configuration
Figure 3-1 Configuration Diagram
External interrupts 0 - 7
LB0, LA0
LB1, LA1
LB2, LA2
LB3, LA3
LB4, LA4
LB5, LA5
LB6, LA6
LB7, LA7
ELVR0 : bit 1-0,
ELVR0 : bit 3-2,
ELVR0 : bit 5-4,
ELVR0 : bit 7-6,
ELVR0 : bit 9-8,
ELVR0 : bit 11-10,
ELVR0 : bit 13-12,
ELVR0 : bit 15-14,
Detect level setting
0
0
1
10
11
0
INT0/P24.0
INT1/P24.1
INT2/P24.2
INT3/P24.3
INT4/SDA2/P24.4
INT5/SCL2/P24.5
INT6/SDA3/P24.6
INT7/SCL3/P24.7
Detect at the rising edge
Detect at the falling edge
External interrupt request flag
ER0,
ER1,
ER2,
ER3,
ER4,
ER5,
ER6,
ER7
EIRR0: bit n0
EIRR0: bit n1
EIRR0: bit n2
EIRR0: bit n3
EIRR0: bit n4
EIRR0: bit n5
EIRR0: bit n6
EIRR0: bit n7
0
1
No interrupt requests
Interrupt request present
WRITE 0: Flag clear
Register number
P24.0
P24.1
P24.2
P24.3
P24.4
P24.5
P24.6
P24.7
DDR24: bit0
DDR24: bit1
DDR24: bit2
DDR24: bit3
DDR24: bit4
DDR24: bit5
DDR24: bit6
DDR24: bit7
0
1
Input only
Enable output
External
interrupt
0
1
2
3
4
5
6
7
External interrupt
request level
setting bit
LB0, LA0
LB1, LA1
LB2, LA2
LB3, LA3
LB4, LA4
LB5, LA5
LB6, LA6
LB7, LA7
External
interrupt
request bit
ER0
ER1
ER2
ER3
ER4
ER5
ER6
ER7
Enable external
interrupt
requests
EN0
EN1
EN2
EN3
EN4
EN5
EN6
EN7
Interrupt
number
#16
#17
#18
#19
#20
#21
#22
#23
The data
direction bit
P24.0
P24.1
P24.2
P24.3
P24.4
P24.5
P24.6
P24.7
Pins
INT0
INT1
INT2
INT3
INT4
INT5
INT6
INT7
1
0
External interrupt request enable flag
EN0,
EN1,
EN2,
EN3,
EN4,
EN5,
EN6,
EN7
ENIR0 : bit 0
ENIR0 : bit 1
ENIR0 : bit 2
ENIR0 : bit 3
ENIR0 : bit 4
ENIR0 : bit 5
ENIR0 : bit 6
ENIR0 : bit 7
0
1
Disable interrupts
Enable interrupts
Interrupt request
(#16, #17, #18, #19,
#20, #21, #22, #23)
Detect at
“L”
level
Detect at
“H”
level
Edge detection circuit
Pins
0
SDA2
SCL2
PFR24: bit4
PFR24: bit5
1
General-purpose port
Peripheral
1
0
(Inputs of other peripheral
function macros)
Read of the port
(Outputs of other peripheral function macros)
From the port data register
SDA3
SCL3
PFR24: bit6
PFR24: bit7
Port
function
SDA2
SCL2
SDA3
SCL3
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