R5F21237JFP Renesas Electronics America, R5F21237JFP Datasheet - Page 431

• Manufacturer Part Number: R5F21237JFP
• Description: MCU 3/5V 48K+2K 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/23r

Specifications of R5F21237JFP

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: CAN, 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• For Use With: RCDK8C - KIT DEV EVAL FOR CAN R8C/23R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
19.3
Figure 19.8
When the SMP bit in the ADCON2 register is set to 1 (with sample and hold function), A/D conversion rate per pin
increases. The sample and hold function is available in all operating modes. Start the A/D conversion after
selecting whether the sample and hold circuit is to be used or not.
Figure 19.8 shows the Timing Diagram of A/D Conversion.
Sample & hold
Sample & hold
Sample and Hold
disabled
enabled
Timing Diagram of A/D Conversion
Page 409 of 501
Conversion time at the 1st bit
Sampling time
Conversion time at the 1st bit
Sampling time
4ø AD cycle
4ø AD cycle
Comparison
Comparison
time
time
at the 2nd bit
Sampling time
2.5ø AD cycle
Comparison
time
at the 2nd bit
* Repeat until conversion ends
Comparison
Comparison
time
time
* Repeat until conversion ends
Sampling time
2.5ø AD cycle
Comparison
time
Comparison
time
19. A/D Converter