AT89C5132 Atmel Corporation, AT89C5132 Datasheet - Page 110
AT89C5132
Manufacturer Part Number
AT89C5132
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT89C5132.pdf
(3 pages)
2.AT89C5132.pdf
(182 pages)
3.AT89C5132.pdf
(38 pages)
4.AT89C5132.pdf
(33 pages)
Specifications of AT89C5132
Flash (kbytes)
64 Kbytes
Max. Operating Frequency
20 MHz
Cpu
8051-12C
Max I/o Pins
44
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Uart
1
Adc Channels
2
Adc Resolution (bits)
10
Adc Speed (ksps)
22.7
Sram (kbytes)
2.25
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 3.6
Timers
2
Isp
UART/USB
Watchdog
Yes
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18.3.3
110
AT89C5132
Baud Rate Selection
(Mode 0)
Figure 18-5. Reception Waveforms (Mode 0)
In mode 0, the baud rate can be either fixed or variable.
As shown in Figure 18-6, the selection is done using M0SRC bit in BDRCON register.
Figure 18-7 gives the baud rate calculation formulas for each baud rate source.
Figure 18-6. Baud Rate Source Selection (mode 0)
Figure 18-7. Baud Rate Formulas (Mode 0)
Write to SCON
a. Fixed Formula
Baud_Rate
RXD
TXD
RI
CLOCK
CLOCK
IBRG0
PER
=
F
PER
6
Set REN, Clear RI
D0
÷ 6
D1
D2
BDRCON.0
M0SRC
D3
0
1
D4
BRL= 256
Baud_Rate=
D5
To
Serial Port
b. Variable Formula
-
D6
6
(1-SPD)
6
(1-SPD)
D7
⋅
16
⋅
F
16
PER
⋅
F
Baud_Rate
PER
⋅
4173E–USB–09/07
(256 -BRL)
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