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Registers Format • 17
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
register.
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 A/D Trigger Mode Control Register
This register is used to control the A/D trigger source and trigger method.
Address: BASE + 0Ah
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
BASE+0Ah X X X X PTRG EITS TPST ASCAN
BASE+0Bh X X X X X X X X
PTRG: Pre-trigger ON/OFF control
0: Pre-trigger OFF
1: Pre-Trigger ON
EITS: External / Internal Trigger Source
1: External Trigger Source
0: Internal Trigger Source
TPST: Timer Pacer/ Software Trigger
0: Software Trigger
1: Timer Pacer Trigger