User`s guide

Registers • 25

3.7 A/D Range and Status Read back Register

The A/D range setting and A/D FIFO status can be read back from this regis ter.

Address: BASE + 8h

Attribute: read only

Data Format:

Bit 7 6 5 4 3 2 1 0

BASE+8h AD_BUSY FF_FF FF_HF FF_EF 0 G2 G1 G0

BASE+9h X X X X X X X X

Where

GC0~GC2: A/D Range control setting

FF_EF: ‘0’ means FIFO is empty

FF_HF: ‘0’ means FIFO is half-full

FF_FF: ‘0’ means FIFO is full, A/D data may have been loss

AD_BUSY: ‘0’ means AD is busy, the A/D data has not been latched in FIFO

yet. If AD_BUSY changes from ‘0’ to ‘1’, A/D is not busy and the

data is written into FIFO.

3.8 Software Trigger Register

To generate a trigger pulse for an A/D conversion, writing any data to this

Address: BASE + 0Eh

Attribute: write only

Data Format:

Bit 7 6 5 4 3 2 1 0

BASE+0Eh X X X X X X X X