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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: 120/174頁
文件大小: 2102K
代理商: W90221F
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The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from Winbond.
120
Versi on 0. 4, March/2000
0xf00002fa (COM1)
0
1
2
3
4
5
6
7
FMENo
RTHo[0:1]
DMOD
IID[0:2]
NOI
Bits 0 Status of "FIFO Mode Enable"
This bit echos if "FIFO mode" is enable or not. Since "FIFO mode" is always enable,
this bit always shows logical 1 when CPU reading this register.
Bit 1-2 Status of RX FIFO threshold level
These bits show current setting of receiver FIFO threshold level (RTH). The meaning of
RTH is defined in the following FCR description.
Bit 3
DMA mode select
The DMA function is
not implemented
in this version. Reading IIR, the bit-3 is always 0.
Bit 4-6 Interrupt Identification bits
The IID[0:2] along with NOI indicate current interrupt request from COM port
Bit 7
No Interrupt (NOI) pended
Table 6.7-3 : Interrupt Control Functions
IIR[4:7]
Priority
Interrupt Type
Interrupt Source
Interrupt Reset
control
--
- - -
1
0 1 1 0
--
None
None
Highest
Receiver Line
Status
(Irpt_RLS)
Overrun Error or
Parity Error or
Framing Error or
Break Interrupt
Receiver FIFO
thres-hold level is
reached
Receiver FIFO is
non-empty and no
activities are
occured in receiver
FIFO during the
TOR defined time
duration
Transmitter Holding
Register Empty
Reading the LSR
0 1 0 0
Second
Received Data
Available
(Irpt_RDA)
Receiver FIFO
Time-out
(Irpt_TOUT)
Receiver FIFO
drops below the
threshold level
Reading the RBR
1 1 0 0
Second
0 0 1 0
Third
Transmitter
Hoding
Register
Empty
(Irpt_THRE)
Reading the IIR (if
source of interrupt
is Irpt_THRE) or
writing into the THR
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