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參數資料
型號: W90221F
廠商: WINBOND ELECTRONICS CORP
英文描述: PA-RISC Embedded Micro-Controller(惠普PA-RISC結構的32位嵌入式微控制器)
中文描述: PA - RISC的嵌入式微控制器(惠普的PA - RISC結構的32位嵌入式微控制器)
文件頁數: 125/174頁
文件大?。?/td> 2102K
代理商: W90221F
=
The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from Winbond.
125
Versi on 0. 4, March/2000
Bit 7
RX FIFO Data Ready
0 = RX FIFO is empty
1 = RX FIFO contains at least 1 received data word.
LSR[3:5] (BI, FE, PE) is revealed to the CPU when its associated character is at the top of the RX
FIFO. These three error indicators are reset whenever the CPU reads the contents of the LSR.
LSR[3:6] (BI, FE, PE, OE) are the error conditions that produce a "receiver line status interrupt"
(Irpt_RLS) when IER[5]=1. Read LSR clear Irpt_RLS.
Writing LSR is a null operation (not suggested).
Modem Status Register (MSR)
Port address : 0xf00003fe (COM0)
0xf00002fe (COM1)
Read only
Power-on Default : ---
0
1
2
3
4
5
6
7
DCD#
RI#
DSR#
CTS#
DDCD
TERI
DDSR
DCTS
Bits 0 Complement version of
Data Carrier Detect
(DCD#) input
Bits 1 Complement version of
Ring Indicator
(RI#) input
Bits 2 Complement version of
Data Set Ready
(DSR#) input
Bits 3 Complement version of
Clear to Send
(CTS#) input
Bits 4 DCD# state change
This bit is set whenever DCD# input has changed state, and it will be reset if the CPU reads
the MSR.
Bits 5 Tailing edge of RI
This bit is set whenever TI# input has changed from high to low, and it will be reset if the
CPU reads the MSR.
Bits 6 DSR# state change
This bit is set whenever DSR# input has changed state, and it will be reset if the CPU reads
the MSR.
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