Section 5.4 Using Preset Values With Extended Mode - Spectrum Controls SLC 500 User Manual

Section 5.4 Using
Preset Values with
Extended Mode
Channel 0 Output Register Configuration (O:e.0)
Config. Bit Description
*15 Normal
14 Roll Under
13 Roll Over
12 Direction
11 Count Size
10 Freq. Filter
9 Stop on Limit
8 Stop on Zero
6/7 Count Mode
4/5 Input Range
3 Rate Mode
2 Reset Flags
1 Counter Preset
Output Word - O:e.1 Counter Preset= 20,000
Output Word - O:e.2 Counter Limit = 20,000
A ring counter is configured by setting the preset and limit values to the same
count and setting the roll over to zero and roll under to preset bits. Zero must
always be the starting point and the maximum value must always be positive.
The above figure illustrates counting in a clockwise direction.
The Counter Preset and Counter Limit functions are affected by the Count Size
Configuration Bit 11. The default counter range is ±32 K but may be extended to
±8 M.
When operating in the extended range, ±8 M, all Counter Preset and Counter
Chapter 5: Programming Examples
Bit Setting
0
1
0
0 (Default)
0 (Default)
0 (Default)
0
0 (Default)
00 (Default)
00 (Default)
0 (Default)
0 (Default)
0 (Default)
User's Manual Pub. 0300181-07 Rev. A
5-3
Description
Normal Mode
Preset
Roll to Zero
No Inversion
±32K
50kHz
No Stop
N/A
Uni-Directional
50mV-30VAC
Instant
Toggle each Rev.
Off