mcs7820 MosChip, mcs7820 Datasheet - Page 12

• Manufacturer Part Number: mcs7820
• Description: Usb-2.0 To Two Serial Ports
• Manufacturer: MosChip

Page 12
MCS7820
USB-2.0 to Two Serial Ports
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
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]
Interrupt Priority
(All Modes)
Bit[2]
Bit[1]
6’b000001
6’b000100
6’b000010
6’b000000
6’b000110
6’b001100
ISR[5:0]
Interrupt
Pending
Rev.
Bit[0]
1.2