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AS8267 Datasheet(PDF) 118 Page - ams AG

Part # AS8267
Description  Single-Phase 2-Current Energy Measurement Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os
PDF  136 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS8267 Datasheet(HTML) 118 Page - ams AG

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Data Sheet AS8267 / AS8268
Revision 1.0, 19-Jun-07
Page 118 of 136
8.10
Serial Interface – UART1
-
Extended version of the standard 8051 UART1
-
SBUF and SCON are compatible with standard 8051
-
Built-in 16 bit baudrate generator (SBAUDH, SBAUDL)
-
Additional SOVR receiver overflow indicator register
UART1 is used to communicate externally. UART1 requires only two pins to receive and transmit information.
UART1 is compatible to the Serial Interface of the 8051 microcontroller family, with the exception of the
baudrate generation. UART1 is functionally identical to UART2. Thus the instructions below are also valid for
UART2.
UART1 is segmented into three main functional blocks, namely Baudrate, Transmission and Reception, as
shown in the block diagram below:
Detected Bit
Receive
Shift Enable
Start
Reception
EndOfReception,
RB8
Data(0...7)
SCON
SBUF
TxD
Interrupt
RxD
16 bit
Baudrate
Generator
Transmit
Baudrate Timer
Receive
Baudrate Timer
SCON
Register
Transmit Unit
RI or TI
EndOfTransmission
Transmission
Reception
Baudrate
TB8
Receive
Shifter
Receive
SBUF
Receive
Control
Receive
Bit Detector
SBAUDH,
SBAUDL
SOVR
Figure 23: UART1 block diagram
There is no direct dependency on osc clock (Mode 0, 3). Instead there is a built-in 16 bit wide baudrate
generator for higher flexibility.



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