M16C Datasheet, PDF (192/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Programmable I/O Port
Table 19-1. 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 or VCC via a
resistor; 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 19-2. Example connection of unused pins in memory expansion mode and microprocessor mode
P82 to P84
Data bus
Pull-up selection
Direction register
Port latch
Input to respective peripheral functions
P55, P62, P66, P77,
P97
Data bus
Pull-up selection
Direction register
Port latch
Input to respective peripheral functions
P63, P67
Data bus
Pull-up selection
Direction register
Port latch
"1"
Output
Nch
P70
Note 1: P63 and P67 can be N-channel open drain only when used as
TXD0/TXD1 pin.
Data bus
Pull-up selection
Direction register
Port latch
"1"
Output
Nch
P85
P71, P91
Input to respective peripheral functions
Note 2: P70
can be N-channel open drain only when
input port it is only usable as CMOS port.
used
as
TXD2
pin.
If
used
as
Data bus
NMI interrupt input
Direction register
Port latch
"1"
Output
(Note 3)
Input to respective peripheral functions
Note 3:
symbolizes a parasitic diode.
Microcomputer
Port P0 to P10 (except for P85)
(Input mode)
···
(Input mode)
(Output mode)
NMI
XOUT
AVCC
BYTE
AVSS
VREF
In single-chip mode
···
Open
Open
VCC
VSS
Microcomputer
Port P6 to P10 (except for P85)
(Input mode)
···
(Input mode)
(Output mode)
NMI
BHE
HLDA
ALE
XOUT
BCLK
HOLD
RDY
AVCC
AVSS
VREF
···
Open
Open
VCC
VSS
In memory expansion mode or
in microprocessor mode
Figure 19-10. Example connection of unused pins
192