R5F213J6CNNP#U0 Renesas Electronics America, R5F213J6CNNP#U0 Datasheet - Page 738

• Manufacturer Part Number: R5F213J6CNNP#U0
• Description: MCU 1KB FLASH 32K ROM 36-QFN
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/3JCr

Specifications of R5F213J6CNNP#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: 31
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 10x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 36-WQFN Exposed Pad, 36-HWQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/3JC Group
REJ09B0602-0100 Rev.1.00
May 12, 2010
34.18 Notes on Noise
34.19 Note on Supply Voltage Fluctuation
Figure 34.7
34.18.1 Inserting a Bypass Capacitor between VCC and VSS Pins as a Countermeasure
34.18.2 Countermeasures against Noise Error of Port Control Registers
After reset is deasserted, the supply voltage applied to the VCC pin must meet either or both the allowable ripple
voltage Vr (vcc) or ripple voltage falling gradient dVr (vcc)/dt shown in Figure 34.7.
VCC
Connect a bypass capacitor (approximately 0.1 µ F) using the shortest and thickest wire possible.
During rigorous noise testing or the like, external noise (mainly power supply system noise) can exceed the
capacity of the MCU’s internal noise control circuitry. In such cases the contents of the port related registers
may be changed.
As a firmware countermeasure, it is recommended that the port registers, port direction registers, and pull-up
control registers be reset periodically. However, examine the control processing fully before introducing the
reset routine as conflicts may be created between the reset routine and interrupt routines.
Vr (vcc)
dVr (vcc)/dt
Symbol
against Noise and Latch-up
Definition of ripple voltage
Allowable ripple voltage
Ripple voltage falling gradient
Parameter
Min.
Standard
Typ.
0.1 VCC
Max.
10
34. Usage Notes
Page 707 of 715
V/ms
Unit
V
Vr (vcc)