R5F2121AJFP#U0 Renesas Electronics America, R5F2121AJFP#U0 Datasheet - Page 469

• Manufacturer Part Number: R5F2121AJFP#U0
• Description: MCU FLASH 96K 5K CMOS 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/21r

Specifications of R5F2121AJFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/20 Group, R8C/21 Group
Rev.2.00 Aug 27, 2008
REJ09B0250-0200
21.9
21.9.1
21.9.2
Connect the bypass capacitor (at least 0.1 µF) using the shortest and thickest as possible.
During severe noise testing, mainly power supply system noise, and introduction of external noise, the data of
port related registers may be changed.
As a firmware countermeasure, it is recommended to periodically reset the port registers, port direction
registers and pull-up control registers. However, examine fully before introducing the reset routine as conflicts
may be created between this reset routine and interrupt routines.
Notes on Noise
Inserting a Bypass Capacitor between VCC and VSS Pins as a
Countermeasure against Noise and Latch-up
Countermeasures against Noise Error of Port Control Registers
Page 451 of 458
21. Usage Notes