UG-498
ADuCM320 Hardware Reference Manual
Rev. C | Page 142 of 196
Bits
Bit Name
Description
Reset
Access
4
EDMAT
DMA requests in transmit mode.
0x0
RW
0: DMA requests are disabled
1: DMA requests are enabled
3
EDSSI
Modem status interrupt. Interrupt is generated when any of COMMSR[3:0]
are set.
0x0
RW
0: interrupt disabled
1: interrupt enabled
2
ELSI
Rx status interrupt.
0x0
RW
0: interrupt disabled
1: interrupt enabled
1
ETBEI
Transmit buffer empty interrupt.
0x0
RW
0: interrupt disabled
1: interrupt enabled
0
ERBFI
Receive buffer full interrupt.
0x0
RW
0: interrupt disabled
1: interrupt enabled
Interrupt Identification Register
Address: 0x40005008, Reset: 0x0001, Name: COMIIR
Table 198. Bit Descriptions for COMIIR
Bits
Bit Name
Description
Reset
Access
[15:3]
RESERVED
Reserved.
0x0
R
[2:1]
STA
Interrupt status. When NIRQ is low (active low), this indicates an interrupt
and the STA bit decoding below is used.
0x0
RC
00: modem status interrupt (read COMMSR to clear)
01: transmit buffer empty interrupt (write to COMTX or read COMIIR to clear)
10: receive buffer full interrupt (read COMRX to clear)
11: receive line status interrupt (read COMLSR to clear)
0
NIRQ
Interrupt flag.
0x1
RC
0: interrupt occurred. Source of interrupt indicated in the STA bits.
1: no interrupt occurred.
Line Control Register
Address: 0x4000500C, Reset: 0x0000, Name: COMLCR
Table 199. Bit Descriptions for COMLCR
Bits
Bit Name
Description
Reset
Access
[15:7]
RESERVED
Reserved.
0x0
R
6
BRK
Set break.
0x0
RW
0: force TxD to 0
1: normal TxD operation
5
SP
Stick parity. Used to force parity to defined values. When set, the parity is
based on the following bit settings :
0x0
RW
EPS = 1 and PEN = 1, parity is forced to 0
EPS = 0 and PEN = 1, parity is forced to 1
EPS = X and PEN = 0, no parity is transmitted
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
RW
0: odd parity is transmitted and checked
1: even parity is transmitted and checked