Measurement Computing CIO-DAS800 - Manual (Page 13)

5 REGISTER MAP
Tables 4-1 and 4-2 contain the write and read functions of the board’s registers. Table 4-3 defines the
functions of each bit.
Note that the register at BASE + 2 is a multi-function register. Its function is set by bits CS0 and CS1 in
BASE + 3 register. Coding for Base + 02 register functions is contained in Table 4-4.
Table 4-5 gives the Gain Select codes for the CIO-DAS800.
NOTE: ONLY +/-5V IS SUPPORTED.
Table 4-6 provides special programming instructions.
Table 4-1. Register Map - Write Functions
Function Data Bits WRITE
Functions
Register 8254 Counter/Timer Control Register Base + 7
Cascade Pre-scaler 8254 C/T 2 Control Register Base + 6
A/D Timer 8254 C/T 1 Control Register Base + 5
8254 C/T 0 Control Register Base + 4
Control Select R0
R1 R2 R3
ENHF CS0 CS1 CSE Base + 3
Scan Limits Register SC0 SC1 SC2 EC0 EC1 EC2 NA NA CS1/0=1/0
Conversion Control ITE CASC DTEN IEOC EACS GTEN NA HCEN CS1/0=0/1
Control Register 1 MA0 MA1 MA2 INTE OP1 OP2 OP3 OP4 CS1/0=0/0
Special Function - (Depends on value of
CS0,1)
Base + 2
Start Conversion* Base + 1
Start Conversion *
Base + 0
D0 D1 D2 D3 D4 D5 D6 D7
* Writing (anything) to either BASE + 0 or BASE + 1 starts a conversion.
9