mcs7840 MosChip, mcs7840 Datasheet - Page 13

• Manufacturer Part Number: mcs7840
• Description: Usb-2.0 To Four Serial Ports
• Manufacturer: MosChip

Rev.
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:
Source and Priority
1.2
Interrupt
Table
Bit[7]
FIFOs Enabled
ISR
Interrupt Status Register
2
Read
0x00
Bit[6]
Priority Level
2a
2b
1
3
4
-
Bit[5]
(Enhanced Mode)
Interrupt Priority
Note: ISR[0] indicates whether any interrupt is pending
or address bit detected in 9-bit mode
Bit[4]
Receiver Data Available
Transmitter THR Empty
Modem Status Change
Receiver Status Error
No interrupt pending
Receiver Time-Out
Interrupt Source
Bit[3]
USB-2.0 to Four Serial Ports
Interrupt Priority
(All Modes)
Bit[2]
MCS7840
Bit[1]
6’b000001
6’b000100
6’b000010
6’b000000
6’b000110
6’b001100
ISR[5:0]
Interrupt
Pending
Bit[0]
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