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參數(shù)資料
| 型號(hào)： | 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(jí)I / O軟盤控制器與紅外線支持 |
| 文件頁(yè)數(shù)： | 22/164頁(yè) |
| 文件大?。?/td> | 621K |
| 代理商： | 37C669 |
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118
CONFIGURATION
The configuration of the chip is programmable
through
software
selectable
configuration
registers.
CONFIGURATION REGISTER ADDRESS
The
address
at
which
the
Configuration
Registers are located is controlled by the nRTS2
pin. The state of the nRTS2 pin is latched by
the trailing edge of hardware reset.
If this
latched state is a 0, the Configuration Registers
are located at address 3F0H-3F1H.
If the
latched state is a 1, then the Configuration
Registers are located at address 370H-371H.
CONFIGURATION REGISTERS
The configuration registers are used to select
programmable options of the chip. After power
up, the chip is in the default mode. The default
modes are identified in the Configuration Mode
Register
Description.
To
program
the
configuration registers, the following sequence
must be followed:
1.
Enter Configuration Mode.
2.
Configure the Configuration Registers.
3.
Exit Configuration Mode.
Enter Configuration Mode
To enter the configuration mode, two writes in
succession to port 3F0H (or 370H) with 55H
data are required. If a write to another address
or port occurs between these two writes, the
chip does not enter the configuration mode. It is
strongly
recommended
that
interrupts
be
disabled for the duration of these two writes.
Configuration Mode
The
chip
contains
configuration
registers
CR00-CR29. These registers are accessed by
first writing the number (0-29H) of the desired
register to port 3F0H (or 370H) and then writing
or reading the configuration register through port
3F1H (or 371H).
Exit Configuration Mode
The configuration mode is exited by writing an
AAH to port 3F0H (or 370H).
Programming Example
The following is an example of a configuration
program in Intel 8086 assembly language.
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