Measurement Computing CIO-CTRxxHD - Manual (Page 10)

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
In summary form, the registers and their function are listed on the following table.
Within each register are eight bits which may constitute a byte of data or eight
individual bit functions.
Table 5-1. Register Functions
Interrupt and Counter Source
for 9513 #3 and 9513 #4 (2nd
ten channels on P2) No read function. BASE +401h
Commands to 9513 #4 Status of 9513 #4 BASE +7
Data for 9513 #4 Data from 9513 #4 BASE +6
Commands to 9513 #3 Status of 9513 #3 BASE +5
Data for 9513 #3 Data from 9513 #3 BASE +4
Additional for CTR20 only
Wait State, Interrupt and
Counter Source for 9513 #1
and 9513 #2 (1st ten channels
on P1) No read function. BASE +400h
Commands to 9513 #2 Status of 9513 #2 BASE +3
Data for 9513 #2 Data from 9513 #2 BASE +2
Commands to 9513 #1 Status of 9513 #1 BASE +1
Data for 9513 #1 Data from 9513 #1 BASE +0
WRITE FUNCTION READ FUNCTION ADDRESS
9513 #1 (U1) is accessed at the bottom half of P1 (pins 1 - 22);
9513 #2 (U2) is the top half of P1 (pins 27 - 48);
9513 #3 (U3) is accessed at the bottom half of P2 (pins 1 - 22);
9513 #4 (U4) is the top half of P2 (pins 27 - 48).
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