Hardware reference guide

Intelligent/Special Purpose
324
35013379 11/2011
Command 4 READS RATE SAMPLE or LAST INPUT COUNT BEFORE PRESET
Command 4 uses one 4X register and six 3X registers as shown in the following
figure.
NOTE: 4X register formats for the commands are described first. The 3X register
contents after issuing Command 1 or 2 are listed after the 4X register description for
Command 2, since the responses are the same for both. The 3X responses for
Commands 3 and 4 immediately follow those commands.
NOTE: When Command 0 (4X = 00XX) or any other undefined commands are
asserted in the 4X register, the 3X registers will contain the count inputs if in count
mode (same as Command 3) and the rate sample values when in rate-sample mode
(same as Command 4).
Command Words Described
The following describes the command words and responses.
Command 1 - CONFIGURE, Output Register Format (4X = 01XX hex)
The following figure shows the 4x output register for command 1.