Measurement Computing PPIO-AI08 - Manual (Page 12)

5.3 PPIO-AI08 REGISTERS
The PPIO-AI08 register descriptions follow the format:
CH1 CH2 CH4 CH8 A/D12
LSB
A/D11 A/D10 A/D9
0 1 2 3 4 5 6 7
Where the numbers along the top row are the bit positions within the 8-bit byte and
the numbers and symbols in the bottom row are the functions associated with that bit.
To write to or read from a register in decimal or HEX, the following weights apply:
80 128 7
40 64 6
20 32 5
10 16 4
8 8 3
4 4 2
2 2 1
1 1 0
HEX VALUE DECIMAL VALUE BIT POSITION
To write control or data to a register, the individual bits must be set to “0” or “1”, then
combined to form a byte.
The registers and their function are listed on the following table. Each register has
eight bits which can constitute a byte of data or eight individual set/read functions.
OP1 - OP4, INTE & MUX
Address
EOC, IP1-IP3, IRQ, MUX
Address
BASE + 2
Start 8 bit A/D conversion A/D Bits 9-12(LSB) BASE + 1
Start 12 bit A/D conversion A/D Bits 1(MSB)
−8
BASE + 0
WRITE FUNCTION READ FUNCTION ADDRESS
8