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CHAPTER 18 8-/10-BIT A/D CONVERTER
18.5 Explanation of Operation of 8-/10-bit A/D Converter
The 8-/10-bit A/D converter has the following A/D conversion modes. Set each mode
according to the setting of the A/D conversion mode select bits in the A/D control status
register (ADCS:MD1, MD0).
• Single-shot conversion mode (restartable/not-restartable during A/D conversion)
• Continuous conversion mode (not-restartable during A/D conversion)
• Pause--conversion mode (not-restartable during A/D conversion)
■ Single-shot Conversion Mode (ADCS: MD1, MD0="00
B
" or "01
B
")
• When the start trigger is inputted, the analog inputs from the start channel (ADCS:ANS3 to ANS0) to
the end channel (ADCS:ANE3 to ANE0) are A/D-converted continuously.
• The A/D conversion stops at the termination of the A/D conversion for the end channel.
• To terminate A/D conversion forcibly, write 0 to the A/D conversion-on flag bit in the A/D control
status register (ADCS:BUSY).
• When the A/D conversion mode select bits (MD1, MD0) are set to "00
B
", this mode can be restarted
during A/D conversion. If the bits are set to "01
B
", this mode cannot be restarted during A/D
conversion.
■ Continuous Conversion Mode (ADCS: MD1, MD0="10
B
")
• When the start trigger is inputted, the analog inputs from the start channel (ADCS:ANS3 to ANS0) to
the end channel (ADCS:ANE3 to ANE0) are A/D-converted continuously.
• When A/D conversion for the end channel is terminated, it is continued after returning to the analog
input for the start channel.
• To terminate A/D conversion forcibly, write 0 to the A/D conversion-on flag bit in the A/D control
status register (ADCS:BUSY).
• This mode cannot be restarted during A/D conversion.
■ Pause-conversion Mode (ADCS: MD1, MD0="11
B
")
• When the start trigger is inputted, A/D conversion starts for the start channel (ADCS:ANS3 to ANS0).
The A/D conversion pauses at the termination of A/D conversion for one channel. When the start trigger
is inputted while A/D conversion pauses, A/D conversion is performed for the next channel.
• The A/D conversion pauses at termination of A/D conversion for the end channel. When the start trigger
is inputted while A/D conversion pauses, A/D conversion is continued after returning to the analog input
for the start channel.
• To terminate A/D conversion forcibly, write 0 to the A/D conversion-on flag bit in the A/D control
status register (ADCS:BUSY).
• This mode cannot be restarted during A/D conversion.