CHAPTER 4 PORT FUNCTIONS
User’s Manual U16896EJ2V0UD
81
(1) Port 3 register (P3)
0 is output
1 is output
P3n
0
1
Control of output data (in output mode) (n = 0 to 5, 8, 9)
P3 (P3H
Note
)
After reset: 00H (output latch) R/W Address: P3 FFFFF406H,
P3L FFFFF406H, P3H FFFFF407H
0
0
P35
P34
P33
P32
P31
P30
0
0
0
0
0
0
P39
P38
8
9
10
11
12
13
14
15
(P3L)
Note
When reading from or writing to bits 8 to 15 of the P3 register in 8-bit or 1-bit units,
specify these bits as bits 0 to 7 of the P3H register.
Remark
The P3 register can be read or written in 16-bit units.
However, when the higher 8 bits and the lower 8 bits of the P3 register are used as
the P3H register and as the P3L register, respectively, this register can be read or
written in 8-bit or 1-bit units.
(2) Port 3 mode register (PM3)
1
Output mode
Input mode
PM3n
0
1
Control of I/O mode (n = 0 to 5, 8, 9)
1
PM35
PM34
PM33
PM32
PM31
PM30
After reset: FFFFH R/W Address: PM3 FFFFF426H,
PM3L FFFFF426H, PM3H FFFFF427H
1
PM3 (PM3H
Note
)
1
1
1
1
1
PM39
PM38
8
9
10
11
12
13
14
15
(PM3L)
Note
When reading from or writing to bits 8 to 15 of the PM3 register in 8-bit or 1-bit units,
specify these bits as bits 0 to 7 of the PM3H register.
Remark
The PM3 register can be read or written in 16-bit units.
When the higher 8 bits and the lower 8 bits of the PM3 register are used as the PM3H
register and as the PM3L register, respectively, this register can be read or written in
8-bit or 1-bit units.
