lm8328tmx National Semiconductor Corporation, lm8328tmx Datasheet - Page 21

• Manufacturer Part Number: lm8328tmx
• Description: Mobile I/o Companion Supporting Keyscan, I/o Expansion Pwm, And Access.bus Host Interface
• Manufacturer: National Semiconductor Corporation

13.1.6 KBDMIS - Keypad Masked Interrupt Status
Register
13.1.7 KBDIC - Keypad Interrupt Clear Register
13.1.8 KBDMSK - Keypad Interrupt Mask Register
Register - Name
Register - Name
Register - Name
Bit - Name
Bit - Name
Bit - Name
(reserved)
(reserved)
MEVTINT
KBDMSK
KBDMIS
MELINT
MKLINT
SFOFF
MSINT
KBDIC
KBDIC
EVTIC
Address
Address
Address
0x07
0x08
0x09
TABLE 24. KBDMIS - Keypad Masked Interrupt Status Register
Bit
7:4
Bit
6:2
Bit
3
2
1
0
7
1
0
TABLE 26. KBDMSK - Keypad Interrupt Mask Register
TABLE 25. KBDIC - Keypad Interrupt Clear Register
Default
Default
Default
Default
Type
Type
R/W
0x0
0x0
0x0
0x0
W
R
Returns the status on masked keyboard interrupts after masking with
the KBDMSK register.
(reserved)
Masked event lost interrupt.
More than 8 keyboard events have been detected and caused the
event buffer to overflow. This bit is cleared by setting bit EVTIC of the
KBDIC register.
Masked keyboard event interrupt.
At least one key press or key release is in the keyboard event buffer.
Reading from EVTCODE until the buffer is empty will clear this
interrupt.
Masked key lost interrupt.
Indicates a lost key-code. This interrupt is asserted when RSINT has
not been cleared upon detection of a new key press or key release,
or when more than 4 keys are pressed simultaneously.
Masked scan interrupt.
Interrupt generated after keyboard scan, if the keyboard status has
changed, after masking process.
Setting these bits clears Keypad active Interrupts
Switches off scanning of special function (SF) keys, when keyboard
has no special function layout.
0: keyboard layout and SF keys are scanned
1: only keyboard layout is scanned, SF keys are not scanned
(reserved)
Clear event buffer and corresponding interrupts REVTINT and
RELINT by writing a 1 to this bit position
Clear RSINT and RKLINT interrupt bits by writing a 1 to this bit
position.
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 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.
21
Register Function
Register Function
Register Function
Bit Functions
Bit Function
Bit Function
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