Process data
Input format:
- Two's complement representation (integer-1 equals 0xFFFF) or
- Signed amount representation (Feature.3) (integer - 1 equals 0x8001)
The output frequency is specified within maximum resolution of 15 bits (the 16th bit is used to specify the direction).
Negative process data results in rotation in the opposite direction. In this case, the internal counter counts to decreasing values.
Relative data
The output frequency is based on the base frequency that is set in registers 36 – 39 and the process data (see table).
Output frequency = base frequency x process data / 32767
Highest resolution = 125 mHz
Example:
Base frequency = 100,000 Hz (maximum selected output frequency)
Process data = 0x00FF (255dec)
Output frequency = 778.22 Hz
Process data | Output value | |
|---|---|---|
| 0x0000 (0dec) | 0% DC |
0x3FFF (16383dec) | 50% of the base frequency, rotation to the right | |
0x7FFF (32767dec) | 100% of the base frequency, rotation to the right | |
Two's complement | 0xC000 (-16384dec) | 50% of the base frequency, rotation to the left |
0x8000 (-32768dec) | 100% of the base frequency, rotation to the left | |
Signed amount representation | 0xBFFF (-16383dec) | 50% of the base frequency, rotation to the left |
0xFFFF (-32767dec) | 100% of the base frequency, rotation to the left | |
Direct data
It is possible to enter the frequency directly (Feature.7). In this case the process data is multiplied by the factor contained in register 42, and directly written to the synthesis chip.
Output frequency = frequency factor x process data x 10 mHz
Highest resolution = 10 mHz
Example:
Frequency factor = 100
Process data = 0x00FF (255dec)
Output frequency = 255 Hz