AT89C5131A-M Atmel Corporation, AT89C5131A-M Datasheet - Page 73
AT89C5131A-M
Manufacturer Part Number
AT89C5131A-M
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT89C5130A-M.pdf
(188 pages)
2.AT89C5130A-M.pdf
(4 pages)
3.AT89C5130A-M.pdf
(34 pages)
Specifications of AT89C5131A-M
Flash (kbytes)
32 Kbytes
Max. Operating Frequency
48 MHz
Cpu
8051-12C
Max I/o Pins
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
1
Uart
1
Sram (kbytes)
1.25
Eeprom (bytes)
1024
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 5.5
Timers
4
Isp
UART/USB
Watchdog
Yes
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15.3.1
15.3.2
Figure 15-5. Internal Baud Rate
4337K–USB–04/08
(T2CON)
TCLK
X
X
X
0
1
0
1
0
1
Baud Rate Selection Table for UART
Internal Baud Rate Generator (BRG)
Peripheral Clock
BRR
When the internal Baud Rate Generator is used, the Baud Rates are determined by the BRG
overflow depending on the BRL reload value, the value of SPD bit (Speed Mode) in BDRCON
register and the value of the SMOD1 bit in PCON register.
Table 15-1.
(T2CON)
RCLK
• The baud rate for UART is token by formula:
FE/SM0
0
0
1
1
0
1
X
X
X
7
SCON Register – SCON Serial Control Register (98h)
SM1
/6
6
(BRL) = 256
Baud_Rate =
(BDRCON)
TBCK
0
0
0
0
1
1
0
0
1
SPD
0
1
SM2
5
auto reload counter
-
2 x 6
2 x 6
(1-SPD)
(1-SPD)
REN
BRG
BRL
(BDRCON)
2
2
4
SMOD1
RBCK
SMOD1
0
0
0
0
0
0
1
1
1
overflow
x 16 x Baud_Rate
x 16 x [256 - (BRL)]
x F
x
F
CLK PERIPH
CLK PERIPH
TB8
3
AT89C5130A/31A-M
/2
Clock Source
INT_BRG
INT_BRG
INT_BRG
UART Tx
Timer 1
Timer 2
Timer 1
Timer 2
Timer 1
Timer 2
RB8
2
SMOD1
0
1
INT_BRG
TI
1
Clock Source
UART Rx
INT_BRG
INT_BRG
INT_BRG
Timer 1
Timer 1
Timer 2
Timer 2
Timer 1
Timer 2
RI
0
73
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