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MCS7840
USB-2.0 to Four Serial Ports
Rev.
1.2
Page 11
Interrupt Enable Register (IER):
Serial channel interrupts are enabled using the Interrupt Enable Register (IER).
Register:
IER
Description:
Interrupt Enable Register
Offset:
1
Permissions:
Read/Write
Access Condition:
LCR[7] = 0
Default Value:
0x0C
Bit[7]
Bit[6]
Bit[5]
Bit[4]
Bit[3]
Bit[2]
Bit[1]
Bit[0]
Reserved
Sleep
Mode
Modem
Int Mask
Rx Stat
Int Mask
Tx Rdy
Int Mask
Rx Rdy
Int Mask
Bit
Description
Operation
0
Rx Rdy
Interrupt Mask
Logic 0: Disable the Receiver Ready Interrupt
Logic 1: Enable the Receiver Ready Interrupt
1
Tx Rdy
Interrupt Mask
Logic 0: Disable the Transmitter Ready Interrupt
Logic 1: Enable the Transmitter Ready Interrupt
2
Rx Stat
Interrupt Mask
Logic 0: Disable the Receiver Status Interrupt
(Normal Mode)
Logic 1: Enable the Receiver Status Interrupt
(Normal Mode)
3
Modem
Interrupt Mask
Logic 0: Disable the Modem Status Interrupt
Logic 1: Enable the Modem Status Interrupt
4
Sleep Mode
Logic 0: Disable Sleep Mode
Logic 1: Enable Sleep Mode where by the internal clock
of the channel is switched OFF
[7:5]
Reserved
Reserved
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