M16C1N Datasheet, PDF (175/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
17. Programmable I/O Ports
17.2 Example connection of unused pins
Table 17.1 shows example connection of unused pins.
Table 17.1 Example connection of unused pins
Pin name
Ports P0 to P5 (Note 1)
Connection
After setting for input mode, connect every pin to VSS (pull-down); or
after setting for output mode, leave these pins open.
XOUT (Note 2)
Open
VREF
Connect to VSS
XIN (Note 3)
Connect to VCC (pull-up) via a resistor
Note 1: Connect unused pins as described above. If connected otherwise, power supply current may
increase due to flow-through current on Schmitt circuit in the port.
Note 2: With external clock input to XIN pin.
Note 3: When the main clock oscillation circuit isn’t used, connect XIN pin to VCC (pull-up), leave XOUT pin
open and set the main clock stop bit (bit 5 at address 000616) to "1" (STOP).
Rev.1.00 Oct 20, 2004 page 163 of 222
REJ09B0007-0100Z