参数资料
型号: 37C669
厂商: 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: 电脑98/99顺从超级I / O软盘控制器与红外线支持
文件页数: 13/164页
文件大小: 621K
代理商: 37C669
11
DESCRIPTION OF PIN FUNCTIONS
QFP/
TQFP
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
84,86
nRing Indicator
nRI1
nRI2
I
Active low Ring Indicator inputs for the
serial port. Handshake signal which notifies
the UART that the telephone ring signal is
detected by the modem.
The CPU can
monitor the status of nRI signal by reading
bit 6 of Modem Status Register (MSR). A
nRI signal state change from low to high
after the last MSR read will set MSR bit 2 to
a 1. If bit 3 of Interrupt Enable Register is
set, the interrupt is generated when nRI
changes state. Note: Bit 6 of MSR is the
complement of nRI.
PARALLEL PORT INTERFACE
73
nPrinter Select
Input
nSLCTIN
OD24
0P24
This active low output selects the printer.
This is the complement of bit 3 of the Printer
Control Register.
Refer to Parallel Port description for use of
this pin in ECP and EPP mode.
74
nInitiate Output
nINIT
OD24
0P24
This output is bit 2 of the printer control
register. This is used to initiate the printer
when low.
Refer to Parallel Port description for use of
this pin in ECP and EPP mode.
76
nAutofeed
Output
nAUTOFD
OD24
0P24
This output goes low to cause the printer to
automatically feed one line after each line is
printed.
The nAUTOFD output is the
complement of bit 1 of the Printer Control
Register.
Refer to Parallel Port description for use of
this pin in ECP and EPP mode.
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