M16C30L Datasheet, PDF (146/166 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Programmable I/O Port
Mitsubishi microcomputers
M16C / 30L Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 1.20.1. Example connection of unused pins in single-chip mode
Pin name
Connection
Ports P0 to P10
(excluding P85)
After setting for input mode, connect every pin to VSS via a resistor
(pull-down); or after setting for output mode, leave these pins open.
XOUT (Note)
Open
NMI
Connect via resistor to VCC (pull-up)
AVCC
Connect to VCC
AVSS, VREF, BYTE
Connect to VSS
Note: With external clock input to XIN pin.
Table 1.20.2. Example connection of unused pins in memory expansion mode and microprocessor mode
Pin name
Connection
Ports P6 to P10
(excluding P85)
After setting for input mode, connect every pin to VSS via a resistor
(pull-down); or after setting for output mode, leave these pins open.
P45 / CS1 to P47 / CS3
Set ports to input mode, set output enable bits of CS1 through CS3 to
0, and connect to Vcc via resistors (pull-up).
BHE, ALE, HLDA,
Open
XOUT (Note 1), BCLK (Note 2)
HOLD, RDY, NMI
AVCC
AVSS, VREF
Connect via resistor to VCC (pull-up)
Connect to VCC
Connect to VSS
Note 1: With external clock input to XIN pin.
Note 2: When the BCLK output disable bit (bit 7 at address 000416) is set to “1”, connect to VCC via a resistor (pull-up).
Microcomputer
Port P0 to P10 (except for P85)
(Input mode)
···
(Input mode)
(Output mode)
NMI
XOUT
AVCC
BYTE
AVSS
VREF
···
Open
Open
VCC
VSS
Microcomputer
Port P6 to P10 (except for P85)
(Input mode)
···
(Input mode)
(Output mode)
···
Open
NMI
Port P45 / CS1
to P47 / CS3
BHE
HLDA
ALE
XOUT
BCLK (Note)
HOLD
Open
VCC
RDY
AVCC
AVSS
VREF
VSS
In single-chip mode
In memory expansion mode or
in microprocessor mode
Note : When the BCLK output disable bit (bit 7 at address 000416) is set to “1”, connect to VCC via a resistor (pull-up).
Figure 1.20.10. Example connection of unused pins
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