153
Chapter 4
Port Functions
User’s Manual U16702EE3V2UD00
(i) External interrupt falling edge specification register 9H (INTF9H)
This is an 8-bit register used to specify detection of the falling 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 INTF9n = INTR9n bit = 0.
2. An on-chip circuit for eliminating noise through analog delay is provided for
external interrupt input.
Figure 4-49:
External Interrupt Falling Edge Specification Register 9H (INTF9H) Format
Remark:
For details on valid edge specification, refer to Table 4-7, “Valid Edge Specification,” on
page 154.
Symbol
7
6
5
4
3
2
1
0
Address
After reset
INTF9H INTF915 INTF914 INTF913
0
0
0
0
0
FFFFFC13H
00H
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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