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M16C/62P Group (M16C/62P, M16C/62PT)
18.1
Mode Description
18.1.1
One-Shot Mode
In one-shot mode, analog voltage applied to a selected pin is converted to a digital code once. Table 18.2 shows
the One-Shot Mode Specifications. Figure 18.5 shows the ADCON0 and ADCON1 Registers (One-shot Mode).
Table 18.2
One-Shot Mode Specifications
Item
Function
A/D Conversion Start
Condition
A/D Conversion Stop
Condition
Interrupt Request
Generation Timing
(1)
Analog Input Pin
Reading of Result of A/D
Converter
NOTES:
1. If VCC2 < VCC1, do not use AN0_0 to AN0_7 and AN2_0 to AN2_7 as analog input pins.
Rev.2.41
Jan 10, 2006
REJ09B0185-0241
http://www.xinpian.net
The CH2 to CH0 bits in the ADCON0 register, the ADGSEL1 to ADGSEL0 bits
in the ADCON2 register and the OPA1 to OPA0 bits in the ADCON1 register
select a pin. Analog voltage applied to the pin is converted to a digital code
once.
• When the TRG bit in the ADCON0 register is "0" (software trigger)
The ADST bit in the ADCON0 register is set to "1" (A/D conversion starts)
• When the TRG bit is "1" (ADTRG trigger)
Input on the ADTRG pin changes state from high to low after the ADST bit is
set to "1" (A/D conversion starts)
• Completion of A/D conversion (If a software trigger is selected, the ADST bit
is cleared to "0" (A/D conversion halted))
• Set the ADST bit to "0"
Completion of A/D conversion
Select one pin from AN0 to AN7, AN0_0 to AN0_7, AN2_0 to AN2_7,
ANEX0 to ANEX1
Read one of the AD0 to AD7 registers that corresponds to the selected pin
Page 238 of 390
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Specification
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18. A/D Converter
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