Explanation Of Operation Of 8-/10-Bit A/D Converter - Fujitsu MB90895 Series Hardware Manual

CHAPTER 13 8/10-bit A/D converter
13.5

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 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)
I Single-shot Conversion Mode (ADCS: MD1, MD0 = "00
• When the start trigger is input, the analog inputs from the start channel (ADCS: ANS2 to ANS0) to the
end channel (ADCS: ANE2 to ANE0) are A/D-converted continuously.
• The A/D conversion pauses after 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
during A/D conversion.If the bits are set to "01
I Continuous Conversion Mode (ADCS: MD1, MD0 = "10
• When the start trigger is input, the analog inputs from the start channel (ADCS: ANS2 to ANS0) to the
end channel (ADCS: ANE2 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.
I Pause-conversion Mode (ADCS: MD1, MD0 = "11
• When the start trigger is input, A/D conversion starts for the start channel (ADCS: ANS2 to ANS0).The
A/D conversion pauses at termination of A/D conversion for a channel.When the start trigger is input
while A/D conversion pauses, A/D conversion for the next channel is started.
• The A/D conversion pauses at the termination of A/D conversion for the end channel.When the start
trigger is input 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.
368
" or "01
B B
", this mode cannot be restarted during A/D conversion.
B
")
B
")
B
")
", this mode can be restarted
B