參數(shù)資料
型號: 37C669
廠商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 電腦98/99順從超級I / O軟盤控制器與紅外線支持
文件頁數(shù): 41/164頁
文件大?。?/td> 621K
代理商: 37C669
135
CR27
This register can only be accessed in the
Configuration Mode and after the CSR has been
initialized
to
27H.
The default value of this
register after power up is 00H. This register is
used to select the IRQ for the FDC (Bits 4:7)
and the parallel port (bits 3:0).
Any unselected
IRQ output (registers CR27-CR29) is in tristate.
CR28
This register can only be accessed in the
Configuration Mode and after the CSR has been
initialized to 28H.
The default value of this
register after power up is 00H. This register is
used to select the IRQ for serial port 1 (bits 7:4)
and for serial port 2 (bits 3:0). Refer to IRQ
Table for CR27.
Any unselected IRQ output
(registers CR27 - CR29) is in tristate.
To properly share an IRQ among UART1 and
UART2:
1)
Configure UART1 to use the desired
IRQ pin.
2)
Set UART2 to 0Fh i.e., set CR28
bits[3:0]=1111.
This selects the share
IRQ mechanism. Refer to Table 60 on
the following page:
D3-D0 or
D7-D4
IRQ Selected
0000
None
0001
IRQ_A
0010
IRQ_B
0011
IRQ_C
0100
IRQ_D
0101
IRQ_E
0110
IRQ_F
0111
Reserved
1000
IRQ_H
CR29
This register can only be accessed in the
Configuration Mode and after the CSR has been
initialized to 29H.
The default value of this
register after power up is 00H. This register is
used to select the IRQ for IRQIN (bits 3:0).
Refer to IRQ Table for CR27.
Bits 7:4 are
reserved
and
return zero when read.
Any
unselected IRQ output (registers CR27-CR29) is
in tristate.
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