ak4184 AKM Semiconductor, Inc., ak4184 Datasheet - Page 24

• Manufacturer Part Number: ak4184
• Description: Tsc With Keypad Scanner And Gpio Expander
• Manufacturer: AKM Semiconductor, Inc.

L
The Keypad Column Mask Register format is shown in Table 19. This register allows a certain column to be masked
from keypad detection.
Addr
L
When a key is pressed with the KST0 bit = “1”, AK4184 does not start the debounce and key scan, the Host
Controller sends a keypad scan initiate command to the AK4184. After receiving the command, the AK4184 starts a
debounce scan, and the Host Controller can then read the data [D15:D0] from the keypad data register (KPDATA1,
KPDATA2). When receiving the command the Keypad Data Resister (KPDATA1, KPDATA2) is reset to 0000H.
Addr
MS0603-E-00
03H
04H
Keypad Column Mask Register (PAGE 1)
Keypad Scan Initiate Command (PAGE 1)
CMx
0
1
KPColumnMASK
KPScanInitiate
NAME
Enable key press detection for a certain column pin (default)
Disable key press detection for a certain column pin
NAME
D15
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0
X
D14
0
X
Table 20. Keypad Scan Initiate Command Format
Table 18. Keypad Column Mask Register Format
D13
0
X
Table 19. Keypad Column Mask bit
D12
0
X
D11
0
Description
X
D10
0
24
X
D9
0
D8
X
0
D7
0
X
D6
0
X
CM6
D5
X
CM5
D4
X
X
CM4
D3
X
CM3
D2
X
CM2
2007/04
D1
[AK4184]
X
CM1
D0
X