LSI Logic Confidential
SIO Register Descriptions
15-83
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
UART1 / UART2 Divisor Latch MSB Register (DLM)
Offset = 0xBE0104 / 0xBE0184
Write only
Default = 0x0000 0000
DMSB
Divisor MSB
31:24
The baud rate generator implements two 8-bit divisor
latches that can be write-only accessed by the external
host processor or SPARC processor. The processor can
load 16-bit data into DLM and DLL (DLM holds the eight
most significant bits, DMSB, and DLL holds the eight
least significant bits, DLSB) to obtain an output (nBD-
OUT) from the baud rate generator that is 16 times the
desired baud rate.
Refer to
Section 15.4.2, “Baud Rate Generator,” page 15-
for more information on generating a desired baud
rate from a given system clock.
UART1 / UART2 Interrupt Enable Register (IER)
Note:
The value of the DLAB bit in the UARTn Line Control
Register determines which register gets physically
read/written:
In either case, these registers are always accessed via the
same software name, UART1_IER0_DLM1 or
UART2_IER0_DLM1.
31
24
23
16
DMSB
RSVD
15
0
RSVD
UARTn_DLM
when DLAB = 1
UARTn_IER
when DLAB = 0
Содержание DMN-8600
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