參數(shù)資料
型號(hào): IT8673F
廠商: Electronic Theatre Controls, Inc.
英文描述: GT 35C 35#12 SKT PLUG
中文描述: 先進(jìn)的輸入/輸出(高級(jí)I / O)的初步規(guī)范V0.5
文件頁數(shù): 106/128頁
文件大?。?/td> 780K
代理商: IT8673F
IT8673F
11.7 Keyboard Controller (KBC)
The keyboard controller is implemented using an 8-bit microcontroller which is capable of executing the
8042 instruction set. For general information, please refer to the description of the 8042 in the 8-bit
controller handbook. In addition, the microcontroller can enter power-down mode by executing two kinds of
power-down instructions. The 8-bit microcontroller has 256 bytes of RAM for data memory and 2 Kbytes of
ROM for the program storage.
The ROM codes may come from various vendors (or users), and are programmed during the
manufacturing process. To assist in developing ROM codes, the keyboard controller has an external
access mode. In the external access mode, the internal ROM is disabled and the instructions executed by
the microcontroller come from an externally connected ROM.
6
Keyboard
Controller
KRST*
KCLK
KDAT
MCLK
MDAT
GATEA20
KIRQ
MIRQ
T0
P26
P10
P27
T1
P23
P11
P22
P24
P25
P20
P21
Figure 11-1. Keyboard and Mouse Interface
11.7.1 Host Interface
The keyboard controller interfaces with the system through the 8042 style host interface. The table below
shows how the interface decodes the control signals.
Table 11-44. Data Register READ/WRITE Controls
Host Address(Note)
R/W*
Function
60h
R
READ DATA
60h
W
WRITE DATA, (Clear F1)
64h
R
READ Status
64h
W
WRITE Command, (set F1)
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