Fujitsu F2MC-8L MB89620 Series Hardware Manual page 272

Table 13.3.1 A/D Control Register 1 (ADC1) Bits
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MB89620 series
Bit
These bits select which of the AN0 to AN7 pins to use as the analog input pin.
When using software activation (ADC2: EXT = "0"), these bits can be modified to
at the same time as activating the A/D conversion or sense function (AD = "1").
ANS3 to ANS0:
Check: Always set ANS3 to "0".
Analog input channel
selection bits
Note: Pins not used as analog inputs can be used as general-purpose ports.
• For the A/D conversion function:
This bit is set to "1" when the A/D conversion is completed.
• For the sense function:
ADI: This bit is set to "1" when the input voltage satisfies the condition set in the
Interrupt request flag compare condition setting bit (SIFM).
bit • An interrupt request is output for either function when both this bit and the
interrupt request enable bit (ADC2: ADIE) are "1".
• Writing "0" clears this bit. Writing "1" has no effect and does not change the bit
value.
This bit indicates whether or not the A/D conversion function is currently
ADMV: performing a conversion or the sense function is currently performing a voltage
Conversion-in- comparison. The bit is set to "1" when a conversion or comparison is in progress.
progress flag bit Note: This bit is read-only. The write value has no meaning and has no effect on
• This bit has no meaning for the A/D conversion function.
• For the sense function:
This bit sets the comparison condition for the input voltage and compare
voltage that generates an interrupt source.
An interrupt request is generated (ADI = "1") when the input voltage is less than
SIFM:
the compare voltage if the bit is "0", and when the input voltage is greater than
Compare condition
the compare voltage if the bit is "1".
setting bit
No interrupt request is generated if the input voltage and compare voltage are
equal.
• When using software activation (ADC2: EXT = "0"), this bit can be modified to at
the same time as starting the sense function (AD = "1").
Check: Do not modify these bits when the ADMV bit is set to "1".
• This bit activates the A/D conversion or sense function by software.
• Writing "1" to this bit activates the A/D conversion or sense function when
AD:
continuous activation is not specified (ADC2: EXT = "0").
A/D converter
Check: • Writing "0" to this bit does not stop the A/D conversion or sense function.
activation bit
Function
If ANS3 is "1", no pin is selected as the analog input pin. Also, disable
general-purpose port output corresponding to the analog input pin.
Do not modify these bits when the ADMV bit is set to "1".
the operation.
The read value is always "0".
• This bit has no meaning when continuous activation is specified.
CHAPTER 13 A/D CONVERTER
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