AT89C51RB2-SLSIM Atmel, AT89C51RB2-SLSIM Datasheet - Page 48

• Manufacturer Part Number: AT89C51RB2-SLSIM
• Description: IC 8051 MCU FLASH 16K 44PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RB2-SLSIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• For Use With: AT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Internal Baud Rate Generator
(BRG)
Figure 21. Internal Baud Rate
48
AT89C51RB2/RC2
Table 32. Baud Rate Selection Table UART
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.
•
Baud_Rate =
F
BRL = 256 -
Clk Periph
(T2CON)
The baud rate for UART is token by formula:
TCLK
0
1
0
1
X
X
0
1
X
6
6
(1-SPD)
(1-SPD)
÷ 6
2
2
(T2CON)
SMOD1
SMOD1
⋅ 32 ⋅ Baud_Rate
⋅ 32 ⋅ (256 -BRL)
RCLK
BDRCON.1
X
X
X
0
0
1
1
0
1
SPD
⋅ F
⋅ F
0
1
PER
PER
BDRCON.4
(BDRCON)
BRR
TBCK
0
0
0
0
1
1
0
0
1
(8 bits)
(8 bits)
BRG
BRL
(BDRCON)
RBCK
0
0
0
0
0
0
1
1
1
Overflow
Clock Source
UART Tx
INT_BRG
INT_BRG
INT_BRG
÷ 2
Timer 1
Timer 2
Timer 1
Timer 2
Timer 1
Timer 2
SMOD1
PCON.7
0
1
4180E–8051–10/06
Clock Source
UART Rx
INT_BRG
INT_BRG
INT_BRG
Timer 1
Timer 1
Timer 2
Timer 2
Timer 1
Timer 2
INT_BRG