LM8330 datasheet(21/54 Pages) TI2

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LM8330

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SNVS839A – JUNE 2012 – REVISED MARCH 2013

Table 23. KBDIC - Keypad Interrupt Clear Register (continued)

Address

Default

Switches off scanning of special function (SF) keys, when keyboard has

no special function layout:

SFOFF

0: keyboard layout and SF keys are scanned

1: only keyboard layout is scanned, SF keys are not scanned

(reserved)

6:2

(reserved)

Clear EVTCODE FIFO and corresponding interrupts REVTINT and

RELINT by writing a 1 to this bit position.

Note: Any key data in the EVTCODE FIFO will be lost when this bit is set;

EVTIC

it is the users responsibility to ensure that all key data is read prior to

asserting this bit. If a key is pressed while EVTIC is asserted/de-asserted

the EVTCODE FIFO will be updated with only the key release code when

the key is released.

Clear RSINT and RKLINT interrupt bits by writing a '1' to this bit position.

KBDIC

Note The KBDCODE registers are not cleared when setting this bit.

KBDMSK - Keypad Interrupt Mask Register

Table 24. KBDMSK - Keypad Interrupt Mask Register

Address

Type

Configures masking of keyboard interrupts. Masked interrupts do not

trigger an event on the Interrupt output.

In case the interrupt processes registers KBDCODE[3:0], MSKELINT and

KBDMSK

0x09

R/W

MSKEINT should be set to '1'. When the Event FIFO is processed,

MSKLINT and MSKSINT should be set. For keyboard polling operations,

all bits should be set and the polling operation consists of reading out the

IRQST.

Bit - Name

Bit

Default

Bit Function

(reserved)

7:4

(reserved)

0: keyboard event lost interrupt RELINT triggers IRQ line

MSKELINT

0x0

1: keyboard event lost interrupt RELINT is masked

0: keyboard event interrupt REVINT triggers IRQ line

MSKEINT

0x0

1: keyboard event interrupt REVINT is masked

0: keyboard lost interrupt RKLINT triggers IRQ line

MSKLINT

0x1

1: keyboard lost interrupt RKLINT is masked

0: keyboard status interrupt RSINT triggers IRQ line

MSKSINT

0x1

1: keyboard status interrupt RSINT is masked

KEYBOARD CODE DETECT REGISTERS

The key code detected by the keyboard scan can be read from the registers KBDCODE0: KBDCODE3. Up to 4

keys can be detected simultaneously. Each KBDCODE register includes a bit (MULTIKEY) indicating if another

key has been detected.

NOTE

Reading out all key code registers (KBDCODE0 to KBDCODE3) will automatically reset

the keyboard scan interrupt RSINT the same way as an active write access into bit KBDIC

of the interrupt clear register does. Reading 0x7F from the KBDCODE0 register means

that no key was pressed.

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