Intel® 400 Series Chipset On-Package Platform Controller Hub
Online Register Database
| ID | Date | Version | Classification |
|---|---|---|---|
| 615146 | 08/09/2019 | 1.2 | Public |
Interrupt Enable Register (IER) – Offset 4
IER mode is only available when LCR register [7] (DLAB bit) = 0.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 30:8 | - | - | Reserved
|
| 7 | 0h | RW | PTIME (PTIME) THRE Interrupt Mode Enable: This is used to enable/disable the generation of THRE Interrupt. |
| 6:4 | - | - | Reserved
|
| 3 | 0h | RW | EDSSI (EDSSI) Enable Modem Status Interrupt: This is used to enable/disable the generation of Modem Status Interrupt. This is the fourth highest priority interrupt. |
| 2 | 0h | RW | ELSI (ELSI) Enable Receiver Line Status Interrupt. This is used to enable/disable the generation of Receiver Line Status Interrupt. This is the highest priority interrupt. |
| 1 | 0h | RW | ETBEI (ETBEI) Enable Transmit Holding Register Empty Interrupt. This is used to enable/disable the generation of Transmitter Holding Register Empty Interrupt. This is the third highest priority interrupt. |
| 0 | 0h | RW | ERBFI (ERBFI) Enable Received Data Available Interrupt. This is used to enable/disable the generation of Received Data Available Interrupt and the Character Timeout Interrupt (if in FIFO mode and FIFOs enabled). These are the second highest priority interrupts. |