HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 361

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

12.2.3
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
0
1
Bits 6 to 0—Reserved Bits: Bits 6 to 0 are reserved; they are always read as 1, and cannot be
modified.
356
Bit
Initial value
Read/Write
A/D Start Register (ADSR)
ADSF
R/W
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
7
0
—
—
6
1
—
—
5
1
—
—
4
1
—
—
3
1
—
—
2
1
—
—
1
1
(initial value)
—
—
0
1