EAGLE
PRELIMINARY
Ver 1.3
3.20.5 Key Scan Control Register (KSCON)
Address : FFE0 8C00h
Bit
31 : 3
2
R/W
R
R/W
Description
Default Value
Reserved
-
0b
Scan Mode select bits
0: Key press mode
1: Key press & release mode
Reserved
Scan Enable bit
1: Scan Enable.
0: Scan Disable.
1
0
R
R/W
-
0b
Scan Enable Bit of Key Scan Control register enables or disables the operation of Key-Pad Controller.
Scan mode and the divisor value of Scan Counter register must be configured prior to enabling key scan operation for
stability purposes.
Scan Mode Selection Bits of Control Register configures the Scan Mode.
In Key press mode, Key is recognized when the Key is pressed. In Press & Release mode, Key is recognized when the Key is
pressed or released.
3.20.6 Key Scan Counter Register (KSCNT)
Address : FFE0 8C04h
Bit
31 : 16
15 : 0
R/W
R
R/W
Description
Reserved
Scan clock divide ratio setting bits.
Default Value
-
FFFFh
Scan Clock Divisor bits in Counter Register determines the Scan rate.
Scanning Frequency = APB Clock / { ( Clock Divisor + 1 ) * 11 } ( Hz )
3.20.7 Key Scan Data Register 1 (KSD1)
Address: FFE0 8C08h
Bit
31:25
24: 0
R/W
R
R
Description
Default Value
Reserved
Scanned Switch value
-
00 0000h
This register stores the state of each switch in a 5x5 Key Matrix. This bit is set when a switch is pressed and a zero means
that the corresponding switch is not pressed. This allows user to acquire the state of key matrix by doing a read to this
register.
Bit
24
23
22
21
20
Switch
SW44
SW43
SW42
SW41
SW40
Bit
19
18
17
16
15
Switch
SW34
SW33
SW32
SW31
SW30
Bit
14
13
12
11
10
Switch
SW24
SW23
SW22
SW21
SW20
Bit
9
8
7
6
Switch
SW14
SW13
SW12
SW11
SW10
Bit
4
3
2
1
Switch
SW04
SW03
SW02
SW01
SW00
5
0
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