參數(shù)資料
型號: MCS7840
廠商: Electronic Theatre Controls, Inc.
英文描述: USB-2.0 to Four Serial Ports
中文描述: 的USB 2.0 4個(gè)串行端口
文件頁數(shù): 13/41頁
文件大小: 447K
代理商: MCS7840
MCS7840
USB-2.0 to Four Serial Ports
Rev.
1.2
Page 13
Interrupt Status Register (ISR):
The source of the highest priority pending interrupt is indicated by the contents of the Interrupt Status
Register. There are
fi
ve sources of interrupts and four levels of priority (1 is the highest) as tabulated below:
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
ISR
Interrupt Status Register
2
Read
0x00
Bit[7]
Bit[6]
Bit[5]
Interrupt Priority
(Enhanced Mode)
Bit[4]
Bit[3]
Bit[2]
Bit[1]
Bit[0]
Interrupt
Pending
FIFOs Enabled
Interrupt Priority
(All Modes)
Interrupt
Source and Priority
Table
Priority Level
-
Interrupt Source
No interrupt pending
Receiver Status Error
or address bit detected in 9-bit mode
Receiver Data Available
Receiver Time-Out
Transmitter THR Empty
Modem Status Change
ISR[5:0]
6’b000001
1
6’b000110
2a
2b
3
4
6’b000100
6’b001100
6’b000010
6’b000000
Note:
ISR[0] indicates whether any interrupt is pending
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