CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U15905EJ1V0UD
139
(g) External interrupt falling edge specification register 9 (INTF9)
This 16-bit register specifies detection of the falling edge of the external interrupt pins.
It can be read or written only in 16-bit units. If the higher 8 bits of the INTF9 register are used as INTF9H
and the lower 8 bits as INTF9L, however, INTF9H and INTF9L can be manipulated in 8-bit or 1-bit units.
Caution
Set the port mode after clearing the INTF9n and INTR9n bits to 0 when switching from the
external interrupt function (alternate function) to the port function because an edge may
be detected.
INTF9
After reset:
0000H R/W
Address:
INTF9: FFFFFC12H, INTF9L: FFFFFC12H
0
0
0
0
INTF93
INTF92
0
0
0
0
0
0
0
0
0
0
8
9
10
11
12
13
14
15
Remark
For how to specify a valid edge, refer to
Table 4-11
.
(h) External interrupt rising edge specification register 9 (INTR9)
This 16-bit register specifies detection of the rising edge of the external interrupt pins.
It can be read or written only in 16-bit units. If the higher 8 bits of the INTR9 register are used as INTR9H
and the lower 8 bits as INTR9L, however, INTR9H and INTR9L can be manipulated in 8-bit or 1-bit units.
Caution
Set the port mode after clearing the INTF9n and INTR9n bits to 0 when switching from the
external interrupt function (alternate function) to the port function because an edge may
be detected.
INTR9
After reset:
0000H R/W
Address:
INTR9: FFFFFC32H, INTR9L: FFFFFC32H
0
0
0
0
INTR93
INTR92
0
0
0
0
0
0
0
0
0
0
8
9
10
11
12
13
14
15
Remark
For how to specify a valid edge, refer to
Table 4-11
.
Содержание V850ES/SA2 UPD703201
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