Interrupt, power supply & reset

STMPE801

18/26

All GPIO registers are named as GPxx, where

Xxx represents the functional group

The function of each bit is shown in the following table:

On power-up reset, all GPIO are set as input.

8.4

Power supply

provides a level-shifting feature to the STMPE801.

8.5

Reset

STMPE801 is equipped with an internal POR circuit that holds the device in reset state, until

The reset pin allows the host to reset the STMPE801 directly. Minimum pulse width of reset

signal is 100

µs.

During the period when reset pin is asserted, all GPIO default to inputs.

Bit

7

65

43

2

1

0

GPxx

IO-7

IO-6

IO-5

IO-4

IO-3

IO-2

IO-1

IO-0

Table 16. Pin function

Register Name

Function

GPIO Monitor Pin State

Reading this bit yields the current state of the bit. Writing has no effect.

GPIO Set Pin State

Writing ‘1’ to this bit causes the corresponding GPIO to go to ‘1’ state.

Writing ‘0’ to this bit causes the corresponding GPIO to go to ‘0’ state.

GPIO Set Pin Direction

‘0’ sets the corresponding GPIO to input state, and ‘1’ sets it to output

state. All bits are ‘0’ on reset.