XR16C2450IJ EXAR [Exar Corporation], XR16C2450IJ Datasheet - Page 7

• Manufacturer Part Number: XR16C2450IJ
• Description: 2.97V TO 5.5V DUART
• Manufacturer: EXAR [Exar Corporation]

xr
REV. 1.0.0
The UART provides the user with the capability to bi-directionally transfer information between an external
CPU and an external serial communication device. A logic 0 on chip select pins, CSA# or CSB#, allows the
user to select UART channel A or B to configure, send transmit data and/or unload receive data to/from the
UART. Selecting both UARTs can be useful during power up initialization to write to the same internal registers,
but do not attempt to read from both uarts simultaneously. Individual channel select functions are shown in
Table
Each UART channel in the 2450 has a standard register set for controlling, monitoring and data loading and
unloading. These registers function as data holding registers (THR/RHR), interrupt status and control registers
(ISR/IER), receive line status and control registers (LSR/LCR), modem status and control registers (MSR/
MCR), programmable data rate (clock) divisor registers (DLL/DLM), and a user accessible scratch pad register
(SPR).
The INTA and INTB interrupt output changes according to the operating mode and enhanced features setup.
Table 2
The 2450 includes an on-chip oscillator (XTAL1 and XTAL2) to produce a clock for both UART sections in the
device. The CPU data bus does not require this clock for bus operation. The crystal oscillator provides a
system clock to the Baud Rate Generators (BRG) section found in each of the UART. XTAL1 is the input to the
oscillator or external clock buffer input with XTAL2 pin being the output.
Generator” on page 8.
2.3
2.4
2.5
2.6
INTA/B Pin
1.
summarizes the operating behavior for the transmitter and receiver. Also see
Channel A and B Selection
Channel A and B Internal Registers
INTA and INTB Outputs
Crystal Oscillator or External Clock Input
0 = a byte in THR
1 = THR empty
T
ABLE
T
RANSMITTER
2: INTA
CSA#
1
0
1
0
T
ABLE
AND
1: C
CSB#
INTB P
1
1
0
0
HANNEL
0 = no data
1 = 1 byte
INS
7
Channel A and B selected
O
A
PERATION FOR
AND
Channel A selected
Channel B selected
UART de-selected
B S
F
UNCTION
ELECT
T
RANSMITTER
R
ECEIVER
See “Programmable Baud Rate
Figure 12
2.97V TO 5.5V DUART
and
XR16C2450
Figure
13.