M32C80 Datasheet, PDF (296/352 Pages) Renesas Technology Corp – 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES

M32C/80 Group
22. Programmable I/O Ports
Table 22.1 Unassigned Pin Settings in Single-Chip Mode
Pin Name
Setting
P0 to P10
(excluding P85)^(1,2,3)
XOUT(4)
_______
NMI(P85)
Enter input mode and connect each pin to VSS via a resistor (pull-down);
or enter output mode and leave pins open
Leave pin open
Connect pin to VCC1 via a resistor (pull-up)
AVCC
Connect pin to VCC1
AVSS, VREF, BYTE Connect pins to VSS
NOTES:
1. 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.
2. Use the shortest possible wiring to connect the microcomputer pins to unassigned pins (within 2 cm).
3. P70 and P71 must output low-level ("L") signals if they are in output mode. They are ports N-channel
open drain outputs.
4. When the external clock is applied to the XIN pin, set the pin as written above.
Table 22.2 Unassigned Pin Setting in Memory Expansion Mode and Microprocessor Mode
Pin Name
Setting
P6 to P10
(excluding P85)^(1,2,3)
_______
_________
BHE, ALE, HLDA,
XOUT(5), BCLK
_______
NMI(P85)
_______ __________
RDY, HOLD
Enter input mode and connect each pin to VSS via a resistor (pull-down);
or enter output mode and leave pins open
Leave pin open
Connect pin to VCC1 via a resistor (pull-up)
Connect pins to VCC2 via a resistor (pull-up)
AVCC
Connect pin to VCC1
AVSS, VREF
Connect pins to VSS
NOTES:
1. 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.
2. Use the shortest possible wiring to connect the microcomputer pins to unassigned pins (within 2 cm).
3. P70 and P71 must outputs low-level ("L") signals if they are in output mode. They are N-channel
open-drain outputs.
4. When the external clock is applied to the XIN pin, set the pin as written above.
Rev. 1.00 Nov. 01, 2005 ^{Page 277} of 330
REJ09B0271-0100