Reference Manual ADuCM356
REGISTER DETAILS: UART
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INTERRUPT IDENTIFICATION REGISTER
Address: 0x40005008, Reset: 0x0001, Name: COMIIR
Table 324. Bit Descriptions for COMIIR
Bits Bit Name Settings Description Reset Access
[15:8] Reserved Reserved. 0x0 R
[7:6] FEND FIFO Enabled. 0x0 R
00 FIFO not enabled, 16450 UART mode.
11 FIFO enabled, 16550 UART mode.
[5:4] Reserved Reserved. 0x0 R
[3:1] STA Interrupt Status. When NIRQ is active low, this bit indicates an interrupt and the following decoding for this
bit is used.
0x0 RC
000 Modem status interrupt. Read COMMSR to clear.
001 Transmit buffer empty interrupt. Write to COMTX or read COMIIR to clear.
010 Receive buffer full interrupt. Read COMRX to clear.
110 Receive FIFO timed out. Read COMRX to clear.
011 Receive line status interrupt. Read COMLSR to clear.
0 NIRQ Interrupt flag. 0x1 RC
LINE CONTROL REGISTER
Address: 0x4000500C, Reset: 0x0000, Name: COMLCR
Table 325. Bit Descriptions for COMLCR
Bits Bit Name Settings Description Reset Access
[15:7] Reserved Reserved. 0x0 R
6 BRK Set Break. 0x0 R/W
1 Force UART_SOUT pin to 0.
0 Normal UART_SOUT pin operation.
5 SP Stick Parity. Used to force parity to defined values. When set, the parity is based on the following bit
settings: When EPS = 1 and PEN = 1, the parity is forced to 0. When EPS = 0 and PEN = 1, the parity is
forced to 1. When EPS = X and PEN = 0, no parity is transmitted.
0x0 R/W
0 Parity is not forced based on EPS and PEN.
1 Parity forced based on EPS and PEN.
4 EPS Parity Select. This bit only has meaning if parity is enabled (PEN set). 0x0 R/W
0 Odd parity is transmitted and checked.
1 Even parity is transmitted and checked.
3 PEN Parity Enable. This bit is used to enable parity to be transmitted and checked. The value transmitted and
the value checked are based on the settings of EPS and SP.
0x0 R/W
0 Parity is not transmitted or checked.
1 Parity is transmitted and checked.
2 STOP Stop Bit. Used to control the number of stop bits transmitted. In all cases, only the first stop bit is evaluated
when data is received.
0x0 R/W
0 Send one stop bit regardless of the word length in the WLS bit.
1 Send a number of stop bits based on the word length. Transmit 1.5 stop bits if the word length is 5 bits
(WLS = 00), or 2 stop bits if the word length is 6 (WLS = 01), 7 (WLS = 10), or 8 bits (WLS = 11).
[1:0] WLS Word Length Select. Selects the number of bits per transmission. 0x0 R/W
00 5 bits.
01 6 bits.
10 7 bits.
11 8 bits.
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