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XR16M770 の電気的特性と機能
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XR16M770のメーカーはExar Corporationです、この部品の機能は「1.62V TO 3.63V HIGH PERFORMANCE UART」です。 |
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製品の詳細 ( Datasheet PDF )
| 部品番号 XR16M770 |
| 部品説明 1.62V TO 3.63V HIGH PERFORMANCE UART |
| メーカ Exar Corporation |
ロゴ |
このページの下部にプレビューとXR16M770ダウンロード（pdfファイル）リンクがあります。 Total 52 pages |
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XR16M770
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO
FEBRUARY 2009
REV. 1.0.0
GENERAL DESCRIPTION
The XR16M7701 (M770) is an enhanced Universal
Asynchronous Receiver and Transmitter (UART) with
64 bytes of transmit and receive FIFOs,
programmable transmit and receive FIFO trigger
levels, automatic hardware and software flow control,
and data rates of up to 16 Mbps at 3.3V, 12.5 Mbps at
2.5V and 7.5 Mbps at 1.8V with 4X data sampling
rate.
The Auto RS-485 Half-Duplex Direction control
feature simplifies both the hardware and software for
half-duplex RS-485 applications. In addition, the
Multidrop mode with Auto Address detection
increases the performance by simplifying the
software routines.
The Independent TX/RX Baud Rate Generator
feature allows the transmitter and receiver to operate
at different baud rates. Power consumption of the
M770 can be minimized by enabling the sleep mode
and PowerSave mode.
The M770 has a 16550 compatible register set that
provide users with operating status and control,
receiver error indications, and modem serial interface
controls. An internal loopback capability allows
onboard diagnostics. The M770 is available in 24-pin
QFN, 32-pin QFN and 25-pin BGA packages. All
three packages offer the 16 mode (Intel bus) interface
only.
NOTE: 1 Covered by U.S. Patent #5,649,122.
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FEATURES
• Pin-to-pin compatible with XR16L570 in 24-QFN
and 32-QFN packages
• Intel data bus Interface
• 16 Mbps maximum data rate
• Programmable TX/RX FIFO Trigger Levels
• TX/RX FIFO Level Counters
• Independent TX/RX Baud Rate Generator
• Fractional Baud Rate Generator
• Auto RTS/CTS Hardware Flow Control
• Auto XON/XOFF Software Flow Control
• Auto RS-485 Half-Duplex Direction Control
• Multidrop mode w/ Auto Address Detect
• Sleep Mode with Automatic Wake-up
• PowerSave mode in 24-pin QFN package
• Infrared (IrDA 1.0 and 1.1) mode
• 1.62V to 3.63V supply operation
• Crystal oscillator or external clock input
APPLICATIONS
• Personal Digital Assistants (PDA)
• Cellular Phones/Data Devices
• Battery-Operated Devices
• Global Positioning System (GPS)
• Bluetooth
FIGURE 1. XR16M770 BLOCK DIAGRAM
Pw rSave
A 2:A 0
D 7:D 0
IO R #
IO W #
CS#
IN T
RESET
In te l
D ata B us
In te rfa c e
UART
UART
Regs
64 B yte TX FIFO
TX &
RX
IR
ENDEC
B R G 64 B yte R X FIFO
C rystal O sc/B uffer
VCC
(1.62 to 3.63 V )
GND
TX, RX,
RTS#, CTS#,
DTR#, DSR#,
R I#, C D #
XTAL1
XTAL2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
1 Page
REV. 1.0.0
PIN DESCRIPTIONS
XR16M770
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO
Pin Description
NAME
24-QFN
PIN#
32-QFN
PIN#
25-BGA
PIN#
TYPE
DESCRIPTION
DATA BUS INTERFACE
A2 12
A1 13
A0 14
D7 3
D6 2
D5 1
D4 24
D3 23
D2 22
D1 21
D0 20
IOR#
11
17
18
19
5
4
3
1
32
31
30
29
14
A5
A4
B4
C3
C2
E3
E1
D1
E2
D2
C1
B5
IOW# 9 12 C5
CS# 6 8 D4
INT 15 20 A3
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MODEM OR SERIAL I/O INTERFACE
TX 5 7 D3
RX 4 6 E4
RTS# 16 21 B3
CTS# 18 24 A1
DTR# - 22 B2
I Address lines [2:0]. These 3 address lines select the internal regis-
ters in UART during a data bus transaction.
I/O Data bus lines [7:0] (bidirectional).
I This input is read strobe (active low). The falling edge instigates an
internal read cycle and retrieves the data byte from an internal reg-
ister pointed by the address lines [A2:A0], puts the data byte on the
data bus to allow the host processor to read it on the rising edge.
I This input is write strobe (active low). The falling edge instigates the
internal write cycle and the rising edge transfers the data byte on
the data bus to an internal register pointed by the address lines.
I This input is chip select (active low) to enable the device.
O
(OD)
This output is the active high device interrupt output. The output
state is defined by the user through the software setting of MCR[3].
INT is set to the active mode when MCR[3] is set to a logic 1. INT is
set to the three state mode when MCR[3] is set to a logic 0. See
MCR[3].
O UART Transmit Data or infrared encoder data. Standard transmit
and receive interface is enabled when MCR[6] = 0. In this mode,
the TX signal will be a logic 1 during reset or idle (no data). Infrared
IrDA transmit and receive interface is enabled when MCR[6] = 1. In
the Infrared mode, the inactive state (no data) for the Infrared
encoder/decoder interface is a logic 0. If it is not used, leave it
unconnected.
I UART Receive Data or infrared receive data. Normal receive data
input must idle at logic 1 condition. The infrared receiver idles at
logic 0. This input should be connected to VCC when not used.
O UART Request-to-Send (active low) or general purpose output.
This output must be asserted prior to using auto RTS flow control,
see EFR[6], MCR[1] and IER[6].
I UART Clear-to-Send (active low) or general purpose input. It can
be used for auto CTS flow control, see EFR[7], MSR[4] and IER[7].
This input should be connected to VCC when not used.
O UART Data-Terminal-Ready (active low) or general purpose output.
3
3Pages
XR16M770
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO
REV. 1.0.0
2.0 FUNCTIONAL DESCRIPTIONS
2.1 CPU Interface
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The M770 data interface supports the Intel compatible types of CPUs. No clock (oscillator
nor external clock) is required for a data bus transaction. Each bus cycle is asynchronous using CS#, IOR#
and IOW# inputs. A typical data bus interconnection for Intel mode is shown in Figure 3.
FIGURE 3. XR16M770 TYPICAL INTEL DATA BUS INTERCONNECTIONS
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
IOR#
IOW#
UART_CS#
UART_INT
POWERSAVE
UART_RESET
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
IOR#
IOW#
CS#
INT
PwrSave
RESET
VCC
TX
RX
DTR#
RTS#
CTS#
DSR#
CD#
RI#
GND
Intel Data Bus Interconnections
VCC
Serial Transceivers of
RS-232
RS-485
RS-422
Or Infrared
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合計 : 52 ページ |
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| 部品番号 | 部品説明 | メーカ |
| XR16M770 | 1.62V TO 3.63V HIGH PERFORMANCE UART | Exar Corporation |