Rev. 3.0, 03/01, page 251 of 390
Keyboard Control/Status Register (KBCSR) [cont’d]
Bit
Description
Default
10
KBCK Pin Status (KBCS)
1: KBCK pin is high level.
0: KBCK pin is low level.
0
9
KBDATA Pin Status (KBDS)
1: KBDATA pin is high level.
0: KBDATA pin is low level.
0
8
Parity Bit (KBDP)
This bit indicates the parity bit of the received data. This bit is read-only; writing this bit is
not effective.
-
7 - 0
Received Data (KBD7-KBD0)
Receiving data is stored. This bit is read-only; writing this bit is not effective.
-
17.3.2
Keyboard Interrupt Status Register (KBISR)
This keyboard control register indicates that receive data shift-register is full or not. When this
register is set, an interrupt will occur. If the software writes 1 to this register, it can clear the
interrupt request.
Address: H'1000DC04
Bit
15
14
13
12
11
10
9
8
Bit Name
-
-
-
-
-
-
-
-
Initial Value
0
0
0
0
0
0
0
0
R/W
R
R
R
R
R
R
R
R
Bit
7
6
5
4
3
2
1
0
Bit Name
-
-
-
-
-
-
-
KBRDF
Initial Value
0
0
0
0
0
0
0
0
R/W
R
R
R
R
R
R
R
R/W
Bit
Description
Default
15 - 1
Reserved
-
0
Received Data Full (KBRDF)
When the keyboard receive data register is full (one data is received), this bit will be set to
“1” and an interrupt request will occur. At the same time, KBCK signal is driven to low
automatically. Otherwise, the software can clear the interrupt request by writing “1” to this
bit.
0
Summary of Contents for HD64465
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