UART Registers
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19.5.1.33 Wake-Up Enable Register (WER)
The wake-up enable register (WER) is used to mask and unmask a UART event that subsequently notifies
the system. An event is any activity in the logic that can cause an interrupt and/or an activity that requires
the system to wake up. Even if wakeup is disabled for certain events, if these events are also an interrupt
to the UART, the UART still registers the interrupt as such. The wake-up enable register (WER) is shown
in Figure 19-66 and described in Table 19-64.
Figure 19-66. Wake-Up Enable Register (WER)
15 8
Reserved
R-0
7 6 5 4 3 2 1 0
TXWAKEUPEN RLS_INTERRUPT RHR_INTERRUPT RX_ ACTIVITY DCD_ACTIVITY RI_ ACTIVITY DSR_ACTIVITY CTS_ACTIVITY
R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 19-64. Wake-Up Enable Register (WER) Field Descriptions
Bit Field Value Description
15-8 Reserved 0 Reserved.
7 TXWAKEUPEN Wake-up interrupt.
0 Event is not allowed to wake up the system.
1 Event can wake up the system: Event can be: THRIT or TXDMA request and/or
TXSATUSIT.
6 RLS_ INTERRUPT Receiver line status interrupt.
0 Event is not allowed to wake up the system.
1 Event can wake up the system.
5 RHR_ INTERRUPT RHR interrupt.
0 Event is not allowed to wake up the system.
1 Event can wake up the system.
4 RX_ ACTIVITY 0 Event is not allowed to wake up the system.
1 Event can wake up the system.
3 DCD_ACTIVITY 0 Event is not allowed to wake up the system.
1 Event can wake up the system.
2 RI_ ACTIVITY 0 Event is not allowed to wake up the system.
1 Event can wake up the system.
1 DSR_ACTIVITY 0 Event is not allowed to wake up the system.
1 Event can wake up the system.
0 CTS_ ACTIVITY 0 Event is not allowed to wake up the system.
1 Event can wake up the system.
3534
Universal Asynchronous Receiver/Transmitter (UART) SPRUH73H–October 2011–Revised April 2013
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