STMPE1801 datasheet(45/60 Pages) STMICROELECTRONICS

45 / 60 page

STMPE1801

Keypad controller

Doc ID 17884 Rev 3

45/60

The KPC_LOCK bit is only used when a combination key is configured in the device. If there

is no combination key programmed, then this bit is not used. This command is used in

conjunction with the combination keys. After the device has entered the keypad lock state,

all subsequent key presses are ignored until the combinational key(s) are detected.

Thereafter, the device exits the lock state, sets the combinational key wakeup status in the

interrupt status register bit IS[4] and sends out the interrupt if it was enabled.

0: Writing 0 aborts the key lock

Writing a 0 to this bit cancels any earlier key lock execution command. If the device has

already entered the lock state, writing 0 exits the lock state.

This bit is readable by the Host and the read status is described as follows:

Reading [1]: KPC lock execution is not completed. It is either waiting for the key press to

stop to enter the lock state or it is already in the lock state.

Reading [0]: KPC is already not in lock state, and not waiting to enter lock state.

[0]SCAN:

1: to start scanning

0: to stop

Note:

All the key configurations and control must be completed before executing the scan

command. Any configuration and control change while scan is active is not supported.

STMPE1801 Datasheet(PDF) 45 Page - STMicroelectronics