AT83C5136 Atmel Corporation, AT83C5136 Datasheet - Page 53

• Manufacturer Part Number: AT83C5136
• Manufacturer: Atmel Corporation

Specifications of AT83C5136

• Max. Operating Frequency: 32 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): 512
• Operating Voltage (vcc): 2.7 to 3.6
• Timers: 4
• Mask Rom (kbytes): 32
• Watchdog: Yes

14.3.1
14.3.2
Figure 14-5. Internal Baud Rate
7683C–USB–11/07
(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 14-1.
(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
/2
Clock Source
INT_BRG
INT_BRG
INT_BRG
UART Tx
Timer 1
Timer 2
Timer 1
Timer 2
Timer 1
Timer 2
AT83C5134/35/36
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
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