tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 477

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Analog/Digital Converter
17.3.4
For A/D conversion, the following four operation modes are supported. For normal A/D conversion, an
operation mode can be selected by setting ADnMOD0<2:1> to an appropriate setting. For top-priority
A/D conversion, the fixed channel single conversion mode is automatically selected, irrespective of the
ADnMOD0<2:1> setting.
(1) Normal A/D conversion
Fixed channel single conversion mode
Channel scan single conversion mode
Fixed channel repeat conversion mode
Channel scan repeat conversion mode
An operation mode is selected with ADnMOD0<REPEAT, SCAN>. As A/D conversion starts,
ADnMOD0<ADBFN> is set to "1." When specified A/D conversion is completed, the A/D
conversion completion interrupt (INTADn) is generated, and ADnMOD0<EOCF> showing the
completion of A/D conversion is set to "1." If <REPEAT>="0," <ADBFN> returns to "0"
concurrently with the setting of EOCF. If <REPEAT> is set to "1," <ADBFN> remains at "1" and
A/D conversion continues.
Fixed channel single conversion mode
If ADnMOD0 <REPEAT, SCAN> is set to "00," A/D conversion is performed in the fixed channel
single conversion mode.
In this mode, A/D conversion is performed once for one channel selected. After A/D conversion is
completed, ADnMOD0<EOCF> is set to "1," ADnMOD0<ADBF> is cleared to "0," and the
interrupt request INTAD is generated. <EOCF> is cleared to "0" upon read.
Channel scan single conversion mode
If ADnMOD0 <REPET,SCAN> is set to "01," A/D conversion is performed in the channel scan
single conversion mode.
In this mode, A/D conversion is performed once for each scan channel selected. After A/D scan
conversion is completed, ADnMOD0<EOCF> is set to "1," ADnMOD0<ADBF> is cleared to "0,"
and the interrupt request INTADn is generated. <EOCF> is cleared to "0" upon read.
Fixed channel repeat conversion mode
If ADnMOD0<REPEAT,SCAN> is set to "10," A/D conversion is performed in fixed channel
repeat conversion mode.
In this mode, A/D conversion is performed repeatedly for one channel selected. After A/D
conversion is completed, ADnMOD <EOCF> is set to "1." ADnMOD0 <ADBF> is not cleared to
"0." It remains at "1." The timing with which the interrupt request INTADn is generated can be
selected by setting ADMOD0 <ITM1:0> to an appropriate setting. <EOCF> is set with the same
timing as this interrupt INTAD is generated.
<EOCF> is cleared to "0" upon read.
With <ITM1:0> set to "00," an interrupt request is generated each time one A/D conversion is
completed. In this case, the conversion results are always stored in the storage register ADnREG0.
After the conversion result is stored, EOCF changes to "1."
With <ITM1:0> set to "01," an interrupt request is generated each time four A/D conversion are
completed. In this case, the conversion results are sequentially stored in storage registers ADREG0
through ADREG3. After the conversion results are stored in ADREG3, <EOCF> is set to "1," and
the storage of subsequent conversion results starts from ADnREG0. <EOCF> is cleared to "0"
A/D Conversion Modes and A/D Conversion Completion Interrupts
TMP19A44(rev1.3) 17-18
TMP19A44
2010-04-01