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: 17/164页
文件大小: 621K
代理商: 37C669
113
UART Power Management
Direct power management is controlled by CR2
bits 3 and 7. Refer to CR2 bits 3 and 7 for more
information.
Auto Power Management is enabled by CR7 bits
5 and 6.
When set, these bit allows the
following auto power management operations:
1.
The transmitter enters auto powerdown
when the transmit buffer and shift register
are empty.
2.
The receiver enters powerdown when the
following conditions are all met:
a.
Receive FIFO is empty
b.
The receiver is waiting for a start bit.
Note:
While in powerdown the Ring Indicator
interrupt is still valid and transitions
when the RI input changes.
Exit Auto Powerdown
The transmitter exits powerdown on a write to
the XMIT buffer.
The receiver exits auto
powerdown when RXDx changes state.
Parallel Port
Direct power management is controlled by CR1
bit 2. Refer to CR1 bit 2 for more information.
Auto Power Management is enabled by CR7 bit
4.
When set, this bit allows the ECP or EPP
logical parallel port blocks to be placed into
powerdown when not being used.
The EPP logic is in powerdown under any of the
following conditions:
1.
EPP is not enabled in the configuration
registers.
2.
EPP is not selected through ecr while in
ECP mode.
The ECP logic is in powerdown under any of the
following conditions:
1.
ECP is not enabled in the configuration
registers.
2
SPP, PS/2 Parallel port or EPP mode is
selected through ecr while in ECP mode.
Exit Auto Powerdown
The parallel port logic can change powerdown
modes when the ECP mode is changed through
the ecr register or when the parallel port mode is
changed through the configuration registers.
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