Keyboard Matrix Interrupt Mask Register (KMIMR)
To control interrupts from a 16 × 16 matrix keyboard at key-sense input pins KEYIN0 to KEYIN15,
there are two keyboard matrix interrupt mask registers, KMIMR and KMIMRA. Bits KMIMR7 to
KMIMR0 in KMIMR correspond to key-sense inputs KEYIN7 to KEYIN0. Bits KMIMR15 to
KMIMR8 in KMIMRA correspond to key-sense inputs KEYIN15 to KEYIN8. Initially, the
KMIMR6 bit that corresponds to the IRQ6/KEYIN6 pin is in the interrupt-enabled state, and the
other interrupt mask bits are in the interrupt-disabled state.
KMIMR is an 8-bit readable/writable register used in keyboard matrix scanning and sensing. This
register initializes to a state in which only the input at the IRQ6 pin is enabled. To enable key-
sense input interrupts from two or more pins during keyboard scanning and sensing, clear the
corresponding mask bits to 0.
Bit
7
6
5
4
3
2
1
0
KMIMR7 KMIMR6 KMIMR5 KMIMR4 KMIMR3 KMIMR2 KMIMR1 KMIMR0
Initial value
Read/Write
1
0
1
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits 7 to 0—Keyboard Matrix Interrupt Mask (KMIMR7 to KMIMR0): These bits control
key-sense input interrupt requests KEYIN7 to KEYIN0.
Bits 7 to 0:
KMIMR7 to KMIMR0
Description
0
1
Key-sense input interrupt request is enabled.
Key-sense input interrupt request is disabled.
(Initial value)*
Note: * Except KMIMR6, which is initially 0.
Bit
7
6
5
4
3
2
1
0
KMIMR15 KMIMR14 KMIMR13 KMIMR12 KMIMR11 KMIMR10 KMIMR9 KMIMR8
Initial value
Read/Write
1
1
1
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits 7 to 0—Keyboard Matrix Interrupt Mask (KMIMR15 to KMIMR8): These bits control
key-sense input interrupt requests KEYIN15 to KEYIN8.
Bits 7 to 0:
KMIMR15 to KMIMR8 Description
0
1
Key-sense input interrupt request is enabled.
Key-sense input interrupt request is disabled.
(Initial value)
72
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