123
Chapter 4
Port Functions
User’s Manual U16702EE3V2UD00
(j) External interrupt rising edge specification register 1 (INTR1)
This is an 8-bit register used to specify detection of the rising edge for the external interrupt pin.
This register can be read and written in 8-bit or 1-bit units.
Cautions: 1. When switching from the external interrupt function (alternate function) to the
port function, edge detection may occur. Therefore, set the port mode after set-
ting INTF10 = INTR10 bit = 0.
2. An on-chip circuit for eliminating noise through analog delay is provided for
external interrupt input.
Figure 4-19:
External Interrupt Rising Edge Specification Register 1 (INTR1) Format
Remark:
For details on valid edge specification, refer to
Table 4-5, “Valid Edge Specification,” on
page 123
.
Symbol
7
6
5
4
3
2
1
0
Address
After reset
INTR1
0
0
0
0
0
0
0
INTR10 FFFFFC22H
00H
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Table 4-5:
Valid Edge Specification
INTF10
INTR10
Valid Edge Specification
0
0
No edge specified
0
1
Rising edge
1
0
Falling edge
1
1
Both edges
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