r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 620

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Table 28.3
Start process time
A/D conversion
execution time
Between-execution process time
End process time
Table 28.3 shows the Number of Cycles for A/D Conversion Items. The A/D conversion time is defined as
follows.
The start process time varies depending on which φ AD is selected.
When 1 (A/D conversion starts) is written to the ADST bit in the ADCON0 register, an A/D conversion starts
after the start process time has elapsed. Reading the ADST bit before the A/D conversion returns 0 (A/D
conversion stops).
In the modes where an A/D conversion is performed on multiple pins or multiple times, the between-execution
process time is inserted between the A/D conversion execution time for one pin and the next A/D conversion
time.
In one-shot mode and single sweep mode, the ADST bit is set to 0 during the end process time and the last A/D
conversion result is stored in the ADi register at the same time.
•
•
In on-shot mode
Start process time + A/D conversion execution time + end process time
When two pins are selected in single sweep mode
Start process time + (A/D conversion execution time + between-execution process time + A/D conversion
execution time) + end process time
Number of Cycles for A/D Conversion Items
A/D Conversion Item
φ AD = fAD
φ AD = fAD divided by 2
φ AD = fAD divided by 4
φ AD = fAD divided by 8
Open-circuit detection disabled
Open-circuit detection enabled
2 or 3 fAD cycles
3 or 4 fAD cycles
5 or 6 fAD cycles
2 or 3 fAD cycles
1 or 2 fAD cycles
40 φ AD cycles + 1 or 3 fAD cycles
42 φ AD cycles + 1 or 3 fAD cycles
1 φ AD cycle
Number of Cycles
28. A/D Converter
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