Datasheet

TMC8462 Datasheet • Document Revision V1.5 • 2019-June-21

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7.17 MFC IO General Purpose IO Block

TMC8462 has 16 general purpose IO lines that can be freely conﬁgured and used via the 24 MFC IO low

voltage and high voltage pins. The general purpose IO signals can be used for indicator LEDs, switch inputs,

and even for relays or small DC motors on the HVIO pins.

When conﬁgured as an output signal, a safe state for each signal is available that is set on the pin in case

the emergency state is triggered using MFC_NES.

Figure 47: Block structure of GPIO Unit

After reset, all signals are conﬁgured as an input and present a Hi-Z state on the GPIO pin they are mapped

to. When a signal should be used as an input signal, no further conﬁguration is required after reset, the

signal state can be read directly from the GPI register (7.3.6.2).

To conﬁgure a signal as an output, a 1 bit must be written to the signal position in the GPIO_CONFIG

The upper 16 bits of the GPO register represent the state in case the emergency state is triggered.

GPO (31..16) GPO (15..0) GPIO_CONFIG MFC_NES GPO signal Comment

X X 0 X Hi-Z Reset state

X 0 1 1 0 Normal operation

X 1 1 1 1 Normal operation

0 X 1 0 0 Emergency State safe output

1 X 1 0 1 Emergency State safe output

Table 206: GPO signal output states

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