AK4184 Datasheet, PDF (24/36 Pages) Asahi Kasei Microsystems – TSC with Keypad Scanner and GPIO Expander

[AK4184]
■ Keypad Column Mask Register (PAGE 1)
The Keypad Column Mask Register format is shown in Table 19. This register allows a certain column to be masked
from keypad detection.
Addr
NAME
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
03H KPColumnMASK 0
0 0 0 0 0 0 0 0 0 CM6 CM5 CM4 CM3 CM2 CM1
Table 18. Keypad Column Mask Register Format
CMx
0
1
Description
Enable key press detection for a certain column pin (default)
Disable key press detection for a certain column pin
Table 19. Keypad Column Mask bit
■ Keypad Scan Initiate Command (PAGE 1)
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
04H
NAME
KPScanInitiate
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
X
X
X
X
X
X XXXXXXXXXX
Table 20. Keypad Scan Initiate Command Format
MS0603-E-00
24
2007/04