SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The 1-Wire Module allows for an overdrive speed to be selected for shorter line lengths. Overdrive is about ten times faster because it uses smaller time periods. It is agreed by both master and slave before enabling. Overdrive is selected using the ODRV bit of the 1-Wire Control and Status (ONEWIRECS) register.
In overdrive mode, the time periods shrink. Table 22-1 shows the active time for 1-Wire operations in overdrive mode. For example, the Master typically drives and holds the line low for 15 µs for a write 1, but in overdrive mode this is 1 µs.
| Operation | Time | Notes |
|---|---|---|
| Write 1 | 1 µs low | Less than 2 µs low |
| Write 0 | 7.5 µs low | Up to 10 µs low |
| Read 1 | 1 µs low | Master samples at 2 µs |
| Read 0 | 9 µs low | Slave holds at least 7 µs |
| Reset | 70 µs low | Note 2 µs delay before reset for safety |
| Answer to Reset | 4 µs to 48 µs | Master samples at 8.5 µs |