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| 型號(hào)： | MCW1001A-I/SS |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 11/66頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC INTERFACE SOCKET XLP 28-SSOP |
| 標(biāo)準(zhǔn)包裝： | 47 |
| 系列： | * |
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2011 Microchip Technology Inc.
Preliminary
DS70671A-page 19
MCW1001A
3.0
UNIVERSAL ASYNCHRONOUS
RECEIVER (UART)
The MCW1001A UART interface consists of the UTX
and URX data signals and the URTS/UCTS flow control
pins. The UART is configurable for several baud rates.
The available data formats and baud rates are listed in
3.1
Initial Configuration
From Reset, the UART is configured for 115200 baud,
8 bits, no parity, and 2 stop bits. The receiver does not
require 2 stop bits, but the MCW1001A will always
transmit serial data with 2 stop bits. It is recommended
that the host use 2 stop bits to improve synchronization
with long packets.
3.2
Autobaud Rate
The autobaud feature of the MCW1001A requires that
the initial byte sent from the host be 0x55. From Reset,
autobaud is enabled, and the first byte sent will set the
rate. This typically requires no special consideration as
the first character of every well-formed packet contains
0x55. Because the receipt of this character cannot be
guaranteed, there are two means of resetting back to
the initialization point. The first is an active Reset (pull
URTS low and return high), and the second is an auto-
retry. If a valid fully-formed message is not received
(indicating a synchronized baud rate) within 1s after the
first byte that set the baud rate, WiComm-Socket will
reinitialize the autobaud procedure and wait for the
next 0x55 input to set the baud rate.
3.3
Rounding Errors
The primary baud rate setting (with the rounding errors)
is shown in Table 3-1. If baud rates other than the ones
shown in the table are used, the error percentage can
be calculated using Equation 3-1 to find the actual
baud rate.
3.4
Hardware Flow Control
Hardware flow control uses the URTS and UCTS pins
as a handshake between two devices. The URTS pin
of one device is typically connected to the UCTS of the
other device.
URTS is an active-low output that notifies the other
device when it is ready to receive data by driving the pin
low. The MCW1001A trip point for de-asserting URTS
(high) is 499 characters. This is one character short of
“buffer full”.
UCTS is an active-low input that notifies the
MCW1001A when it is ready to send data. The
MCW1001A will check UCTS just before loading and
sending UART data. If the pin is asserted during a
transfer, the transfer will continue as shown in
3.5
Flow Control Disabled
Hardware handshaking may be circumvented by
physically tying the UCTS input low (active) instead of
allowing it to be driven by the URTS signal from the
host. In this case, the URTS output should be left
unconnected, and allowed to freely change state.
FIGURE 3-1:
URTS/UCTS
CONNECTIONS EXAMPLE
EQUATION 3-1:
SOLVING FOR ACTUAL
BAUD RATE
URTS
UCTS
I am ready
to receive
I’ll transmit
if okay
I am ready
to receive
I’ll transmit
if okay
MCU
MCW1001A
ActualRate
12MHz
int x
()
------------------
=
Where:
x
12MHz
DesiredBaud
-----------------------------------
=
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| MCW1001AT-I/SS | 功能描述:IC INTERFACE SOCKET XLP 28-SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:* 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
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