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AS8218 Datasheet(PDF) 109 Page - ams AG

Part # AS8218
Description  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS8218 Datasheet(HTML) 109 Page - ams AG

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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 109 of 123
Baudrate
[Baud]
3.00MHz
error [%]
3.58MHz
(3579545Hz)
error [%]
4.00MHz
error [%]
300
624
0
745
0.0351
832
-0.0400
600
312
0.1597
372
0.0350
416
0.0799
1200
155
-0.1603
185
-0.2337
207
-0.1603
2400
77
-0.1603
92
-0.2337
103
-0.1603
4800
38
-0.1603
46
0.8326
51
-0.1603
9600
19
2.3438
22
-1.3232
25
-0.1603
19200
9
2.3438
11
2.8986
12
-0.1603
38400
4
2.3438
5
2.8986
(6)
6.9940
57600
(2)
-8.5069
3
2.8986
(3)
-8.5069
76800
(1)
-22.0703
2
2.8986
(2)
-8.5069
115200
(1)
18.6198
1
2.8986
(1)
-8.5069
Below there are the formulas for calculating Baudrate and BaudrateReloadRegister, but also the error. You
have to divide through 16 because the serial bit is further divided into 16 time slices.
()
er
loadRegist
BaudrateRe
1
16
ency
ClockFrequ
Baudrate
+
×
=
1
Baudrate
16
ency
ClockFrequ
er
loadRegist
BaudrateRe
−
×
=
baudrate
_
desired
)
gister
Re
load
Re
Baudrate
1
(
16
ency
ClockFrequ
baudrate
_
desired
error
+
×
−
=
Transmission
A write access to register SBUF invokes the transmission of a byte. If there is already an ongoing transmission
then the written byte is discarded. At the end of transmission flag SCON.TI is set, indicating the software that
the next byte can be written to SBUF.
Reception
The process of receiving is initiated by setting SCON.REN to ‘1’ and SCON.RI to ‘0’ by software. After
reception the UART1 sets SCON.RI to ‘1’ and the data bits can be fetched from SBUF. Each data bit of the
serial data stream is probed three times (in the middle of the bit time) to achieve noise immunity.
Interrupt
Per default the UART1 is operated in the ‘command mode’ (as described in section SCT) and an interrupt is
asserted to the MCU except when a command is detected. The UART1 can also be used in the direct access
mode (bit dam = ‘1’ in SCT register 9001h). This setting allows the MCU to operate the UART1 as defined in
the standard 8051 configuration.



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