
Page 389
4
9
4
f
o
5
0
2
,
1
0
.
l
u
J
3
0
.
1
.
v
e
R
3
0
1
0
-
7
3
0
B
9
0
J
E
R
24. Programmable I/O Ports
)
T
5
8
/
C
2
3
M
,
5
8
/
C
2
3
M
(
p
u
o
r
G
5
8
/
C
2
3
M
Table 24.1 Unassigned Pin Settings in Single-Chip Mode
Pin Name
Setting
P0 to P15
Enter input mode and connect each pin to VSS via a resistor (pull-down);
(excluding P85)(1,2,3.4,6) or enter output mode and leave the pins open
XOUT(5)
Leave pin open
_______
NMI(P85)
Connect pin to VCC1 via a resistor (pull-up)
AVCC
Connect pin to VCC1
AVSS, VREF, BYTE
Connect pins to VSS
NOTES:
1. P11 to P15 are provided in the 144-pin package only.
2. If the port enters output mode and is left open, it is in input mode before output mode is entered by
program after reset. While the port is in input mode, voltage level on the pins is indeterminate and
power consumption may increase.
Direction register settings may be changed by noise or failure caused by noise. Configure direction
register settings regulary to increase the reliability of the program.
3. Use the shortest possible wiring to connect the microcomputer pins to unassigned pins (within 2 cm).
4. P70 and P71 must put in low-level ("L") signal outputs if they are in output mode. They are N-channel
open-drain outputs.
5. When the external clock is applied to the XIN pin, set the pin as written above.
6. In the 100-pin package, set "FF16" in the following addresses, in addition to the above settings:
Addresses 0003CB16, 0003CE16, 0003CF16, 0003D216, 0003D316
Table 24.2 Unassigned Pin Setting in Memory Expansion Mode and Microprocessor Mode
Pin Name
Setting
P6 to P15
Enter input mode and connect each pin to VSS via a resistor (pull-down);
(excluding P85)(1,2,3.4,6) or enter output mode and leave the pins open
_________
BHE, ALE, HLDA,
Leave pin open
XOUT(5), BCLK
_______
NMI(P85)
Connect pin to VCC1 via a resistor (pull-up)
_______
__________
RDY, HOLD
Connect pins to VCC2 via a resistor (pull-up)
AVCC
Connect pin to VCC1
AVSS, VREF
Connect pins to VSS
NOTES:
1. P11 to P15 are provided in the 144-pin package only.
2. If the port enters output mode and is left open, it is in input mode before output mode is entered by
program after reset. While the port is in input mode, voltage level on the pins is indeterminate and
power consumption may increase.
Direction register settings may be changed by noise or failure caused by noise. Configure direction
register settings regulary to increase the reliability of the program.
3. Use the shortest possible wiring to connect the microcomputer pins to unassigned pins (within 2 cm).
4. P70 and P71 must put in low-level ("L") signal outputs if they are in output mode. They are N-channel
open-drain outputs.
5. When the external clock is applied to the XIN pin, set the pin as written above.
6. In the 100-pin package, set "FF16" in the following addresses, in addition to the above settings:
Addresses 0003CB16, 0003CE16, 0003CF16, 0003D216, 0003D316