R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 412
![IC R8C/25 MCU FLASH 52LQFP](/photos/12/37/123739/r5f21257snfp_u0_sml.jpg)
R5F21257SNFP#U0
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
-
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Manufacturer
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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
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