W90N745CD Datasheet, PDF (382/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
KeyPad Interface Low Power Mode Configuration Register (KPILPCONF)
REGISTER
KPILPCOF
ADDRESS
0xFFF8_8008
R/W
DESCRIPTION
W/R Low power configuration register
RESET VALUE
0x0000_0000
31
30
29
28
27
26
25
24
RESERVED
23
22
21
20
19
18
17
16
WAKE
15
14
13
12
11
10
9
8
LPWCEN
7
6
5
4
3
2
1
0
RESERVED
LPWR
BITS
[31:17]
[16]
[15:8]
[7:4]
[3:0]
RESERVED
WAKE
LPWCEN
RESERVED
LPWR
DESCRIPTION
-
Lower power wakeup enable
Setting this bit enables low power wakeup
1 = wakeup enable
0 = not enable
Low power wakeup column enable
Specify columns for low power wakeup. For example, if user wants to
use keys in row N and column 0, 2, 5 to wake up W90N745, then the
LPWCEN should be fill 8’b00100101.
-
Low power wakeup row address
Define the row address keys used to wakeup. For 16x8 or 8x8 (with
4:16 or 3:8 decoder) keypad key configuration, LPWR means “Hex”
code but for 4x8 (without decoder), LPWR means “binary” code. For
example, if user wants to use all keys on row 3 of 16x8 keypad to
wakeup W90N745, then 0x3 should be fill into this register but for 4x8
keypad it should be filled as 4’b1000.
Publication Release Date: September 22, 2006
- 377 -
Revision A2