参数资料
型号: PC87393F-VJG
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 外设及接口
英文描述: 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封装: TQFP-100
文件页数: 86/148页
文件大小: 1733K
代理商: PC87393F-VJG
2.0 Device Architecture and Configuration (Continued)
42
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2.10.6
SuperI/O Configuration 5 Register (SIOCF5)
Location:
Index 25h
Type:
Varies per bit
Bit
76543210
Name
PNF Status
Pin 35
Function
Select
SMI to IRQ2
Enable
Pin 34
Function
Select
PPM Power
Save Enable
Pin 71
Function
Select
Reset
10000000
Bit
Description
7
PNF Status. This bit describes the status of the PNF signal, which determines if Parallel Port of external FDD sig-
nals are selected by PPM mode. This is a RO bit.
0: Floppy Disk
1: Parallel Port (default)
6-5
Pin 35 Function Select. These are R/W bits.
Bits
Function
6 5
0 0
PPM disabled (default)
0 1
PNF signal selected as active low (high selects printer, low selects floppy)
1 0
PNF signal selected as active high (low selects printer, high selects floppy)
1 1
XRDY signal selected
4
SMI to IRQ2 Enable. This is a R/W bit.
0: Disabled (default)
1: Enabled
3
Pin 34 Function Select. This is a R/W bit.
0: DRATE0 (default)
1: IRSL2
2
PPM Power Save Enable
0: Disabled (default).
1: When PPM is active and PNF is 0 (bit 7 of this register), the FDC output pins and the Parallel Port output
pins are masked when the corresponding drive is not used.
1-0
Pin 71 Function Select.1 This is a R/W bit.
Bits
Function
1 0
0 0
GPIO37 (default)
0 1
DR1
1 0
IRSL2
1 1
XIORD
1.
In the PC87391, this pin is pulled up after reset by an internal pull-up resistor. Software should set this eld as
appropriate to enable the required Legacy function.
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