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R8C/15 Folha de dados(PDF) 202 Page - Renesas Technology Corp

Nome de Peças R8C/15
Descrição Electrónicos  16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / R8C/Tiny SERIES
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
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R8C/14 Group, R8C/15 Group
17. Programmable I/O Ports
Rev.2.10
Jan 19, 2006
Page 190 of 253
REJ09B0164-0210
17.5
Unassigned Pin Handling
Table 17.18 lists the Unassigned Pin Handling. Figure 17.9 show the Unassigned Pin Handling.
NOTES:
1. When setting these ports to output mode and leaving them open, they remain input mode until they
are switched to output mode by a program. The voltage level of these pins may be indeterminate
and the power current may increase while the ports remain input mode.
The content of the direction registers may change due to noise or out of control caused by noise. In
order to enhance program reliability, set the direction registers periodically by a program.
2. Connect these unassigned pins to the microcomputer using the shortest wire length (within 2 cm)
as possible.
3. When power-on reset function is used.
Figure 17.9
Unassigned Pin Handling
Table 17.18
Unassigned Pin Handling
Pin Name
Connection
Ports P1, P3_3 to P3_5,
P3_7, P4_5
• After setting to input mode, connect every pin to VSS via a resistor (pull-
down) or connect every pin to VCC via a resistor (pull-up).(2)
• After setting to output mode, leave these pins open.(1, 2)
Ports P4_6, P4_7
Connect to VCC via a resistor (pull-up)(2)
AVCC, VREF
Connect to VCC
RESET (3)
Connect to VCC via a resistor (pull-up)(2)
NOTES:
1. When power-on reset function is used.
Microcomputer
Port P1, P3_3 to P3_5,
P3_7, P4_5
(Input mode)
:
:
(Input mode)
(Output mode)
Port P4_6, P4_7
RESET(1)
AVCC/VREF
:
:
Open



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