Measurement Computing CIO-DAS800 User Manual
Page 16
Table 4-4. Coding for Base + 02 Register Functions
ID Register
Not defined
1
1
Status Register #2
Scan Limits Reg
0
1
Status Register #2
Conversion Control
1
0
Status Register #2
Control Reg # 1
0
0
Read Function
Write Function
CS0
CS1
Control Register Selected
Table 4-5. Special Programming Instructions
External Interrupt is rising edge, External Pacer is falling edge
External Interrupt and External (Pacer) Clock are mutually exclusive
INT/XCLK
Bit
"Gate", Requires DTEN=1, GTEN=0
Level
Gating
Requires DTEN=1, GTEN=0
Edge
Triggering
CT/1 decrements each time CT/2 counts to zero; AD converts when CT/1 counts
to zero
Cascade
CT/2 divides the 1MHz timebase; AD converts when CT/2 counts to zero
Normal
Pacing
Operating
modes
Not appplicable.
Gain/Range
ID 1/0: 0/0= (DAS800], 0/1= reserved, 1/0= N/A, 1/1= N/A)
Only the 1st two bits are needed for software, the upper six are for compatibility with KMB
software
ID
Select Start and End Channel before setting EACS
Ending channel (n) can be lower than starting channel (m) : m,...,6,7,0,1,...,n,m...
Scan Limits
Set HCEN last, by itself (ie write 80h) , set the other bits first
HCEN is used as a master enable for AD Pacing
Conv/Control
Register
Special Programming instructions
12