R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 415

• Manufacturer Part Number: R5F21257SNFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21257SNFP#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: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 52-LQFP
• For Use With: R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
18.7
• Write to each bit (other than bit 6) in the ADCON0 register, each bit in the ADCON1 register, or the SMP bit
• When the VCUT bit in the ADCON1 register is changed from 0 (VREF not connected) to 1 (VREF
• After changing the A/D operating mode, select an analog input pin again.
• When using the one-shot mode, ensure that A/D conversion is completed before reading the AD register. The
• When using the repeat mode, select the frequency of the A/D converter operating clock φAD or more for the
• If the ADST bit in the ADCON0 register is set to 0 (A/D conversion stops) by a program and A/D conversion
• Connect 0.1 µF capacitor between the P4_2/VREF pin and AVSS pin.
• Do not enter stop mode during A/D conversion.
• Do not enter wait mode when the CM02 bit in the CM0 register is set to 1 (peripheral function clock stops in
in the ADCON2 register when A/D conversion is stopped (before a trigger occurs).
connected), wait for at least 1 µs before starting the A/D conversion.
IR bit in the ADIC register or the ADST bit in the ADCON0 register can be used to determine whether A/D
conversion is completed.
CPU clock during A/D conversion.
Do not select the fOCO-F for the φAD.
is forcibly terminated during an A/D conversion operation, the conversion result of the A/D converter will be
undefined. If the ADST bit is set to 0 by a program, do not use the value of the AD register.
wait mode) during A/D conversion.
Notes on A/D Converter
Feb 29, 2008
Page 396 of 485
18. A/D Converter