r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 141

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
7.6
Figure 7.17
Table 7.62
Notes:
Ports P0 to P2, P3_0 and P3_1,
P3_3 to P3_5, P3_7, P4_3 to
P4_7, P6
Port P4_2/VREF
RESET
Table 7.62 lists Unassigned Pin Handling.
1. If these ports are set to output mode and left open, they remain in input mode until they are switched
2. Connect these unassigned pins to the MCU using the shortest wire length (2 cm or less) possible.
3. When the power-on reset function is in use.
to output mode by a program. The voltage level of these pins may be undefined and the power
current may increase while the ports remain in input mode.
The content of the direction registers may change due to noise or program runaway caused by
noise. In order to enhance program reliability, the program should periodically repeat the setting of
the direction registers.
Unassigned Pin Handling
(3)
Pin Name
Unassigned Pin Handling
Unassigned Pin Handling
Note:
1. When the power-on reset function is in use.
P3_3 to P3_5, P3_7,
P4_3 to P4_7, P6
P3_0 and P3_1,
• After setting to input mode, connect each pin to VSS via a resistor
• After setting to output mode, leave these pins open.
Connect to VCC
Connect to VCC via a pull-up resistor
Port P0 to P2,
(pull-down) or connect each pin to VCC via a resistor (pull-up).
MCU
Port P4_2/VREF
(Output mode)
(Input mode )
(Input mode)
RESET
:
:
(1)
Open
:
:
Connection
(2)
(1, 2)
Page 109 of 740
7. I/O Ports
(2)