23.5.4 Control D
| Name: | CTRLD |
| Offset: | 0x03 |
| Reset: | 0x00 |
| Property: | - |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| HREN[1:0] | SCALEMODE[1:0] | AMPEN | SCALE | ||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | |||
Bits 7:6 – HREN[1:0] High Resolution Enable
| Value | Name | Description |
|---|---|---|
| 0x0 | OFF | High Resolution disabled |
| 0x1 | 4X | Resolution increased by four (two bits) |
| 0x2 | 8X | Resolution increased by eight (three bits) |
| 0x3 | - | Reserved |
Bits 5:4 – SCALEMODE[1:0] Scale mode
| Value | Name | Description |
|---|---|---|
| 0x0 | CENTER | Offset generated so written compare values are scaled from center, 50% duty cycle |
| 0x1 | BOTTOM | Offset generated so written compare values are scaled from BOTTOM, 0% duty cycle |
| 0x2 | TOP | Offset generated so written compare values are scaled from TOP, 100% duty cycle |
| 0x3 | TOPBOTTOM | Written compare values < 50% are scaled from TOP, and written compare values > 50% are scaled from BOTTOM. 0% values give compare value 0, and 100% values give compare value equal to TOP. |
Bit 3 – AMPEN Amplitude Control Enable
1’ enabled the use of amplitude and offset registers. Setting
this bit to ‘1’ has only a function if the SCALE bit is written to
‘1’.Bit 2 – SCALE Scale Enable
Setting this bit to ‘1’ allows writing fractional value to the
Compare, Compare Buffer and Amplitude registers. If scaling is enabled, a write
to the Compare (TCEn.CMPn) or Compare Buffer (TCEn.CMPnBUF) register is
multiplied with the Amplitude (TCEn.AMP) or Period (TCEn.PER) register. A write
to the Amplitude (TCEn.AMP) register is multiplied with the period (TCEn.PER)
register.
The written value must be of format UQ1.15 providing a range between 0 and 2 - 2-15.
| Value | Name | Description |
|---|---|---|
| 0 | NORMAL | An absolute value is used when writing to the AMP and CMPn registers |
| 1 | FRACTIONAL | A fractional value is used when writing to the AMP and CMPn registers |