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SST89E58RD2-33-I-NJF2 Datasheet(PDF) 40 Page - Silicon Storage Technology, Inc

No. de pieza SST89E58RD2-33-I-NJF2
Descripción Electrónicos  FlashFlex51 MCU
Download  81 Pages
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Fabricante Electrónico  SST [Silicon Storage Technology, Inc]
Página de inicio  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST89E58RD2-33-I-NJF2 Datasheet(HTML) 40 Page - Silicon Storage Technology, Inc

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Data Sheet
FlashFlex51 MCU
SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD
SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD
©2006 Silicon Storage Technology, Inc.
S71255-05-000
5/06
6.0 SERIAL I/O
6.1 Full-Duplex, Enhanced UART
The device serial I/O port is a full-duplex port that allows
data to be transmitted and received simultaneously in
hardware by the transmit and receive registers, respec-
tively, while the software is performing other tasks. The
transmit and receive registers are both located in the
Serial Data Buffer (SBUF) special function register. Writ-
ing to the SBUF register loads the transmit register, and
reading from the SBUF register obtains the contents of
the receive register.
The UART has four modes of operation which are selected
by the Serial Port Mode Specifier (SM0 and SM1) bits of
the Serial Port Control (SCON) special function register. In
all four modes, transmission is initiated by any instruction
that uses the SBUF register as a destination register.
Reception is initiated in mode 0 when the Receive Interrupt
(RI) flag bit of the Serial Port Control (SCON) SFR is
cleared and the Reception Enable/ Disable (REN) bit of the
SCON register is set. Reception is initiated in the other
modes by the incoming start bit if the REN bit of the SCON
register is set.
6.1.1 Framing Error Detection
Framing Error Detection is a feature, which allows the
receiving controller to check for valid stop bits in modes 1,
2, or 3. Missing stops bits can be caused by noise in serial
lines or from simultaneous transmission by two CPUs.
Framing Error Detection is selected by going to the PCON
register and changing SMOD0 = 1 (see Figure 6-1). If a
stop bit is missing, the Framing Error bit (FE) will be set.
Software may examine the FE bit after each reception to
check for data errors. After the FE bit has been set, it can
only be cleared by software. Valid stop bits do not clear FE.
When FE is enabled, RI rises on the stop bit, instead of the
last data bit (see Figure 6-2 and Figure 6-3).
FIGURE
6-1: Framing Error Block Diagram
1255 F16.0
SM0/FE
SM1
SM2
REN
TB8
RB8
TI
RI
SMOD0
SMOD1
POF
GF1
GF0
PD
IDL
SCON
(98H)
PCON
(87H)
Set FE bit if stop bit is 0 (framing error) (SMOD0 = 1)
SM0 to UART mode control (SMOD0 = 0)
To UART framing error control
BOF


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