Dual Mode Control Configuration

Name:
DUALCTRL
Offset:
0x01
Reset:
0x00
Access:
-
Bit76543210
SDAHOLD[1:0]FMPENENABLE
AccessR/WR/WR/WR/W
Reset0000

Bits 3:2 – SDAHOLD[1:0]: SDA Hold Time

SDA Hold Time

These bits select the SDA hold time for the TWI Slave.

This bit field is ignored when the dual control is disabled.

Table 1. SDA Hold Time
SDAHOLD[1:0] Nominal Hold Time [ns] Hold Time Range Across all Corners [ns] Description
0x0 0 0 Hold time OFF.
0x1 50 36 - 131 Backward compatible setting.
0x2 300 180 - 630 Meets SMBus specification under typical conditions.
0x3 500 300 - 1050 Meets SMBus specification across all corners.

Bit 1 – FMPEN: FM Plus Enable

FM Plus Enable

This bit selects the 1 MHz bus speed for the TWI Slave. This bit is ignored when dual control is disabled.

Bit 0 – ENABLE: Dual Control Enable

Dual Control Enable

Writing this bit to ‘1’ enables the TWI dual control.