Single-Shot Conversion Mode - Fujitsu MB90895 Series Hardware Manual

13.5.1

Single-shot conversion mode

In the single conversion mode, A/D conversion is performed sequentially from the start
channel to the end channel.The A/D conversion pauses after A/D conversion for the end
channel.
I Setting of Single-shot Conversion Mode
Operating the 8-/10-bit A/D converter in the single conversion mode requires the setting shown in Figure
13.5-1.
ADCS
ADCR
ADER
: Unused
: Used bit
: Setting "1" to corresponding bit using as analog input pin
0 : Setting "0"
I Operation of Single-shot Conversion Mode
• When the start trigger is input, A/D conversion starts from the channel set by the A/D conversion start
channel select bits (ANS2 to ANS0) and is performed continuously up to the channel set by the A/D
conversion end channel select bits (ANE2 to ANE0).
• The A/D conversion stops at the termination of the A/D conversion for the channel set by the A/D
conversion end channel select bits (ANE2 to ANE0).
• 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
conversion.
[When start and end channels are the same]
• If the start and end channels have the same channel number (ADCS: ANS2 to ANS0 = ADCS: ANE2 to
ANE0), only one A/D conversion for one channel set as the start channel (= end channel) is performed
and terminated.
Figure 13.5-1 Setting of Single-shot Conversion Mode
bit15 14 13 12 11 10
BUSY INT INTE PAUS STS1 STS0
S10 ST1 ST0 CT1 CT0
CHAPTER 13 8/10-bit A/D converter
9 bit8 bit7 6 5 4
Re-
STRT MD1 MD0 ANS2 ANS1 ANS0
served
0 0
D9 D0 (hold the conversion result)
", this mode cannot be restarted during A/D
B
3 2 1 bit0
ANE2 ANE1 ANE0
", this mode can be restarted
B
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