Fujitsu MB91260B Series Hardware Manual page 350

Table 14.4-2 Functions of Each Bit in A/D Mode Setting Register (ADMD) (2 / 2)
Bit Name
CT1, CT0:
bit3
Compare time
bit2
setting bits
ST1, ST0:
bit1
Sampling time
bit0
setting bits
These bits are used to select the comparison time at the A/D conversion. After analog input
is loaded (after the sampling time has elapsed), then after the time specified in these bits has
passed, the conversion results are checked, and stored in the A/D control status register
(ADCD).
Notes:
• When CT1 and CT0 = 00
When CT1 and CT0 = 01
is not set to these values or greater, it may not be possible to obtain correct analog
conversion value.
• Only rewrite these bits before conversion begins, with the A/D operation stopped.
These bits are used to select the sampling time at the A/D conversion.
When A/D is activated, analog input is retrieved for the time set in these bits.
Notes:
• If the sampling time is not set to 450 ns or more, it may not be possible to obtain correct
analog conversion values.
• Only rewrite these bits before conversion begins, with the A/D operation stopped.
CHAPTER 14 8/10-BIT A/D CONVERTER
Function
, 10 , or 11 , the compare time must be set to at least 720 ns.
B B B
, the compare time must be set to at least 900 ns. If the time
B
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