Rev. 3.0, 03/01, page 250 of 390
17.3.1
Keyboard Control/Status Register (KBCSR)
This keyboard control register contains receive data shift register and keyboard interface
control/status bits.
Address: H'1000DC00
Bit
15
14
13
12
11
10
9
8
Bit Name
KBCIE
KBCOE
KBDOE
KBCD
KBDD
KBCS
KBDS
KBDP
Initial Value
0
0
0
0
0
0
0
-
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
Bit
7
6
5
4
3
2
1
0
Bit Name
KBD7
KBD6
KBD5
KBD4
KBD3
KBD2
KBD1
KBD0
Initial Value
-
-
-
-
-
-
-
-
R/W
R
R
R
R
R
R
R
R
Bit
Description
Default
15
KBCK Input Enable Bit (KBCIE)
This bit is used to be KBCK pin input enable control signal.
1: KBCK pin input enable.
0: KBCK pin input is disabled. At transferring data (system->keyboard), this bit must be
cleared to 0. This bit is also cleared to 0 when 1-byte of data is received from keyboard.
0
14
KBCK Output Enable Bit (KBCOE)
This bit is used to be KBCK pin output enable control signal.
1: KBCK pin output enable.
0: KBCK pin output is disabled (signal will go to Hi-Z).
0
13
KBDATA Output Enable Bit (KBDOE)
This bit is used to be KBDATA pin output enable control signal.
1: KBDATA pin output enable.
0: KBDATA pin output is disabled (signal will go to Hi-Z).
0
12
KBCK Driven Bit (KBCD)
1: KBCK signal is driven to high level.
0: KBCK signal is driven to low level.
0
11
KBDATA Driven Bit (KBDD)
1: KBDATA signal is driven to high level.
0: KBDATA signal is driven to low level.
0
Содержание HD64465
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