R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 412

• 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
18.3
Figure 18.8
18.4
Figure 18.9
When the SMP bit in the ADCON2 register is set to 1 (sample and hold function enabled), the A/D conversion rate
per pin increases. The sample and hold function is available in all operating modes. Start A/D conversion after
selecting whether the sample and hold circuit is to be used or not.
Figure 18.8 shows a Timing Diagram of A/D Conversion.
Figure 18.9 shows the A/D Conversion Cycles.
Without Sample & Hold
Without Sample & Hold
Sample and hold
Sample and hold
With Sample & Hold
With Sample & Hold
Sample and Hold
A/D Conversion Cycles
Feb 29, 2008
A/D Conversion Mode
disabled
enabled
Timing Diagram of A/D Conversion
A/D Conversion Cycles
Sampling time
Sampling time
Page 393 of 485
4ø AD cycles
4ø AD cycles
Conversion time of 1st bit
Conversion time of 1st bit
10 bits
10 bits
8 bits
8 bits
Conversion
49φAD
59φAD
28φAD
33φAD
Time
Comparison
Comparison
time
time
Conversion time at the 1st bit
Sampling
4φAD
4φAD
4φAD
4φAD
Time
2.5ø AD cycles
Sampling time
Comparison
2nd bit
time
Comparison
2.0φAD
2.0φAD
2.5φAD
2.5φAD
* Repeat until conversion ends
Time
2nd bit
Comparison
Comparison
time
time
Conversion time at the 2nd
Sampling
0.0φAD
0.0φAD
2.5φAD
2.5φAD
Time
bit and the follows
2.5ø AD cycles
Sampling time
* Repeat until conversion ends
Comparison
time
Comparison
2.5φAD
2.5φAD
2.5φAD
2.5φAD
Time
Comparison
time
18. A/D Converter
End process
End process
8.0φAD
8.0φAD
4.0φAD
4.0φAD