HD6433802H Datasheet, PDF (306/435 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

12.2.3 A/D Start Register (ADSR)
Bit
7
6
5
4
3
2
1
0
ADSF
—
—
—
—
—
—
—
Initial value
0
1
1
1
1
1
1
1
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), which also sets ADSF to 1.
When conversion is complete, the converted data is set in ADRRH and ADRRL, 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
0
1
Description
Read: Indicates the completion of A/D conversion
Write: Stops A/D conversion
Read: Indicates A/D conversion in progress
Write: Starts A/D conversion
(initial value)
Bits 6 to 0: Reserved bits
Bits 6 to 0 are reserved; they are always read as 1, and cannot be modified.
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