LM8327 datasheet(21/65 Pages) TI2

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LM8327

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SNLS329A – SEPTEMBER 2011 – REVISED MAY 2013

KBDMSK - Keypad Interrupt Mask Register

Table 25. 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

EVTCODE.

Bit - Name

Bit

Default

Bit Function

(reserved)

7:4

(reserved)

0: keyboard event lost interrupt RELINT triggers IRQ line

MSKELINT

0x1

1: keyboard event lost interrupt RELINT is masked

0: keyboard event interrupt REVINT triggers IRQ line

MSKEINT

0x1

1: keyboard event interrupt REVINT is masked

0: keyboard lost interrupt RKLINT triggers IRQ line

MSKLINT

0x0

1: keyboard lost interrupt RKLINT is masked

0: keyboard status interrupt RSINT triggers IRQ line

MSKSINT

0x0

1: keyboard status interrupt RSINT is masked

KBDCODE0 - Keyboard Code Register 0

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.

Please 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

Table 26. KBDCODE0 - Keyboard Code Register 0

Address

Default

KBDCODE0

0x0B

Holds the row and column information of the first detected key.

Bit - Name

Bit

Default

Bit Function

MULTIKEY

0x0

If this bit is 1 another key is available in KBDCODE1 register.

KEYROW[2:0]

6:4

0x7

ROW index of detected key (0 to 7)

KEYCOL[3:0]

3:0

0xF

Column index of detected (0 to 11, 12 for special function key).

KBDCODE1 - Keyboard Code Register 1

Table 27. KBDCODE1 - Keyboard Code Register 1

Address

Default

KBDCODE1

0x0C

Holds the row and column information of the second detected key.

Bit - Name

Bit

Default

Bit Function

MULTIKEY

0x0

If this bit is 1 another key is available in KBDCODE2 register.

KEYROW[2:0]

6:4

0x7

ROW index of detected key (0 to 7)

KEYCOL[3:0]

3:0

0xF

Column index of detected key (0 to 11, 12 for special function key).

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