R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 114

• Manufacturer Part Number: R5F21324CNSP#U0
• Description: MCU 1KB FLASH 16K ROM 20-LSSOP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/32Cr

Specifications of R5F21324CNSP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, PWM, Voltage Detect, WDT
• Number Of I /o: 15
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-LSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/32C Group
REJ09B0573-0100 Rev.1.00 Dec. 18, 2009
Page 85 of 573
7.6
Figure 7.9
Table 7.26
Notes:
Ports P1, P3_3 to P3_5,
P3_7, P4_5 to P4_7
Port P4_2/VREF
RESET
Table 7.26 lists Unassigned Pin Handling. Figure 7.9 shows the 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
Pin Name
(3)
Unassigned Pin Handling
Unassigned Pin Handling
• After setting to input mode, connect each pin to VSS via a resistor (pull-down)
• After setting to output mode, leave these pins open.
Connect to VCC
Connect to VCC via a pull-up resistor
Note:
or connect each pin to VCC via a resistor (pull-up).
1. When the power-on reset function is in use.
P3_3 to P3_5,
P4_5 to P4_7
Port P1,
P3_7,
MCU
Port P4_2/VREF
(Output mode)
(Input mode )
(Input mode)
RESET
:
:
(1)
Connection
Open
:
:
(2)
(2)
(1, 2)
7. I/O Ports