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12. A/D Converter
12.2.3
A/D Start Register (ADSR)
Bit
ADSF
Initial value
Read/Write
R/W
The A/D start register (ADSR) is an 8-bit read/write register for starting and stopping A/D
conversion.
A/D conversion is started by writing 1 to the A/D start flag (ADSF) or by input of the designated
edge of the external trigger signal, which also sets ADSF to 1. When conversion is complete, the
converted data is set in the A/D result register (ADRR), and at the same time ADSF is cleared
to 0.
Bit 7—A/D Start Flag (ADSF): Bit 7 controls and indicates the start and end of A/D conversion.
Bit 7: ADSF
Description
0
Read: Indicates the completion of A/D conversion
Write: Stops A/D conversion
1
Read: Indicates A/D conversion in progress
Write: Starts A/D conversion
Bits 6 to 0—Reserved Bits: Bits 6 to 0 are reserved; they are always read as 1, and cannot be
modified.
Rev.3.00 Jul. 19, 2007 page 320 of 532
REJ09B0397-0300
7
6
5
⎯
⎯
0
1
1
⎯
⎯
4
3
⎯
⎯
⎯
1
1
⎯
⎯
⎯
2
1
0
⎯
⎯
1
1
1
⎯
⎯
(initial value)
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