R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 143

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
Figure 14.7 A/D Conversion Cycles
Figure 14.6 A/D Conversion Timing Diagram
14.4 A/D conversion cycles
14.3 Sample and Hold
Sample & Hold
Figure 14.7 shows the A/D conversion cycles.
If the SMP bit in the ADCON2 register is set to “1” (with sample-and-hold), the conversion speed per
pin is increased to 28
and-hold is effective in all operation modes. Select whether or not to use the sample-and-hold function
before starting A/D conversion.
When performing the A/D conversion, charge the comparator capacitor inside the microcomputer.
Figure 14.6 shows the A/D conversion timing diagram.
Sample & Hold
Jan 27, 2006
Without sample & hold
Without sample & hold
With sample & hold
With sample & hold
disabled
A/D conversion mode
enabled
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Sampling time
Sampling time
Conversion time at the 1st bit
Conversion time at the 1st bit
4 AD cycle
4 AD cycle
10 bits
10 bits
8 bits
8 bits
ØAD
cycles for 8-bit resolution or 33
Conversion
49 AD
59 AD
28 AD
33 AD
time
Comparison
Comparison
time
time
Sampling
4 AD
4 AD
4 AD
4 AD
time
Conversion time
14.3 Sample and Hold mode/14.4 A/D conversion cycles
at the 1st bit
at the 2nd bit
Comparison
Sampling time
2.5 AD cycle
time
Comparison
at the 2nd bit
2.0 AD
2.0 AD
2.5 AD
2.5 AD
time
Comparison
ØAD
Comparison
* Repeat until conversion ends
time
time
Sampling
cycles for 10-bit resolution. Sample-
2.5 AD
2.5 AD
0.0 AD
0.0 AD
Conversion time at the
2nd bit and the follows
time
* Repeat until conversion ends
* Repeat until conversion ends
2.5 AD cycle
Sampling time
Comparison
2.5 AD
2.5 AD
2.5 AD
2.5 AD
time
Comparison
End process
End process
time
8.0 AD
8.0 AD
4.0 AD
4.0 AD