Renesas M16C/60 Series Hardware Manual page 252

Under development
This document is under development and its contents are subject to change.
M16C/6N5 Group
Table 1.20.1 Unassigned Pin Handling in Single-chip Mode
Pin name
Ports P0 to P7, P8
0
P8 , P8 , P9, P10
6 7
X (Note 4)
OUT
_______
NMI(P8 )
5
AV
CC
AV , V , BYTE
SS REF
Note 1: When setting the port for output mode and leave it open, be aware that the port remains in input mode
until it is switched to output mode in a program after reset. For this reason, the voltage level on the pin
becomes indeterminate, causing the power supply current to increase while the port remains in input mode.
Furthermore, by considering a possibility that the contents of the direction registers could be
changed by noise or noise-induced runaway, it is recommended that the contents of the direction
registers be periodically reset in software, for the increased reliability of the program.
Note 2: Make sure the unused pins are processed with the shortest possible wiring from the microcomputer
pins (within 2 cm).
Note 3: When the ports P7
The ports P7
1
Note 4: With external clock input to X
Table 1.20.2 Unassigned Pin Handling in Memory Expansion Mode and Microprocessor Mode
Pin name
Ports P0 to P7, P8
0
P8 , P8 , P9, P10
6 7
______ ______
P4 /CS to P4 /CS
5 1 7 3
________ __________
BHE, ALE, HLDA,
X (Note 5), BCLK (Note 6)
OUT
___________ ________ _______
HOLD, RDY, NMI(P8
AV
CC
AV , V
SS REF
Note 1: When setting the port for output mode and leave it open, be aware that the port remains in input mode
until it is switched to output mode in a program after reset. For this reason, the voltage level on the pin
becomes indeterminate, causing the power supply current to increase while the port remains in input mode.
Furthermore, by considering a possibility that the contents of the direction registers could be
changed by noise or noise-induced runaway, it is recommended that the contents of the direction
registers be periodically reset in software, for the increased reliability of the program.
Note 2: Make sure the unused pins are processed with the shortest possible wiring from the microcomputer
pins (within 2 cm).
Note 3: If the CNV pin has the V
SS
mode is switched over in a program after reset. For this reason, the voltage levels on these pins
become indeterminate, causing the power supply current to increase while they remain set for input ports.
Note 4: When the ports P7
The ports P7
1
Note 5: With external clock input to X
Note 6: If the PM0 register's PM07 bit is set to "1" (BCLK not output), connect this pin to V
(pulled high).
Rev.1.00 2003.05.30 page 238
to P8 , After setting for input mode, connect every pin to V
4
or after setting for output mode, leave these pins open. (Notes 1, 2, 3)
Open
Connect via resistor to V
Connect to V
Connect to V
and P9 are set for output mode, make sure a low-level signal is output from the pins.
1 1
and P9 are N-channel open-drain outputs.
1
pin.
IN
to P8 , After setting for input mode, connect every pin to V
4
or after setting for output mode, leave these pins open. (Notes 1, 2, 3, 4)
Connect to V
CC
corresponding direction bit for CS
the CSR register's CS
Open
) Connect via resistor to V
5
Connect to V
Connect to V
level applied to it, these pins are set for input ports until the processor
SS
and P9 are set for output mode, make sure a low-level signal is output from the pins.
1 1
and P9 are N-channel open-drain outputs.
1
pin.
IN
Connection
(pull-up)
CC
CC
SS
Connection
via a resistor (pulled high) by setting the PD4 register's
_____
(i = 1 to 3) to "0" (input mode) and
i
_____
bit to "0" (chip select disabled).
i
(pull-up)
CC
CC
SS
Programmable I/O Ports
via a resistor (pull-down);
SS
via a resistor (pull-down);
SS
via a resistor.
CC