AN3245

Software

Doc ID 17747 Rev 1

13/19

2

Software

2.1

2.1.1

I

It is recommended to insert the software reset as the first command during initialization

2.2

Programming guide

Figure 12.

Typical programming flow

2.2.1

Initialization

The following is an example for device initialization based on standard implementation for

keypad, GPIO, and hotkey.

●

Keypad initialization (e.g. 10x8 keypad initialization)

WriteRegister(SYS_CTRL, 0x80);//Issue SW reset

WriteRegister(KPC_ROW,0xFF); //Activate all rows

WriteRegister(KPC_COL_LOW,0xFF); //Activate all columns

WriteRegister(KPC_COL_HIGH,0x03);

WriteRegister(KPC_CTRL_LOW,0xF0);