Toshiba H1 SERIES TLCS-900 - Manual (Page 210)

TMP92CM22
2007-02-16 92CM22-208
3. Channel fixed repeat conversion mode
Setting ADMOD0 and ADMOD0 to “10” selects conversion
channel fixed repeat conversion mode.
In this mode data on one specified channel is converted repeatedly. When
conversion has been completed, ADMOD0 is set to “1” and
ADMOD0 is not cleared to “0” but held at “1”. INTAD interrupt request
generation timing is determined by the setting of ADMOD0.
Clearing to “0” generates an interrupt request every time an AD
conversion is completed.
Setting to “1” generates an interrupt request on completion of every
fourth conversion.
4. Channel scan repeat conversion mode
Setting ADMOD0 and ADMOD0 to “11” selects conversion
channel scan repeat conversion mode.
In this mode data on the specified scan channels is converted repeatedly. When
each scan conversion has been completed, ADMOD0 is set to “1” and an
INTAD interrupt request is generated. ADMOD0 is not cleared to “0” but
held at “1”.
To stop conversion in a repeat conversion mode (e.g., in cases c and d), program
a "0” to ADMOD0. After the current conversion has been completed,
the repeat conversion mode terminates and ADMOD0 is cleared to “0”.
Switching to a halt state (IDLE2 mode with ADMOD1 cleared to “0”,
IDLE1 mode or STOP mode) immediately stops operation of the AD converter
even when AD conversion is still in progress. In repeat conversion modes (e.g., in
cases c and d), when the halt is released, conversion restarts from the beginning.
In single conversion modes (e.g., in cases a and b), conversion does not restart
when the halt is released (The converter remains stopped).
Table 3.11.2 shows the relationship between the AD conversion modes and
interrupt requests.
Table 3.11.2 Relationship between the AD Conversion Modes and Interrupt Requests AD
ADMOD0
Mode
Interrupt Request
Generation
Channel fixed single
conversion mode
After completion of
conversion
X 0 0
Channel scan single
conversion mode
After completion of scan
conversion
X 0 1
Every conversion 0 Channel fixed repeat
conversion mode
Every forth conversion 1
1 0
Channel scan repeat
conversion mode
After completion of every
scan conversion
X 1 1
X: Don’t care