AT89C51ED2-SMSUM Atmel, AT89C51ED2-SMSUM Datasheet - Page 52

• Manufacturer Part Number: AT89C51ED2-SMSUM
• Description: IC 8051 MCU FLASH 64K 68PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51ED2-SMSUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 68-PLCC
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: EUART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 48
• Number Of Timers: 3 bit
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• For Use With: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

14.4.1
Figure 14-5. Internal Baud Rate
52
AT89C51RD2/ED2
Internal Baud Rate Generator (BRG)
Table 14-3.
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 =
• The baud rate for UART is token by formula:
BRL = 256 -
(T2CON)
TCLK
X
X
X
0
1
0
1
0
1
F
Clk Periph
6
6
(1-SPD)
(1-SPD)
Baud Rate Selection Table UART
2
2
SMOD1
SMOD1
⋅ 32 ⋅ Baud_Rate
⋅ 32 ⋅ (256 -BRL)
(T2CON)
RCLK
÷ 6
X
X
X
0
0
1
1
0
1
⋅ F
⋅ F
PER
PER
BDRCON.1
SPD
0
1
(BDRCON)
TBCK
0
0
0
0
1
1
0
0
1
BDRCON.4
BRR
(BDRCON)
(8 bits)
(8 bits)
RBCK
BRG
BRL
0
0
0
0
0
0
1
1
1
Overflow
Clock Source
INT_BRG
INT_BRG
INT_BRG
UART Tx
Timer 1
Timer 2
Timer 1
Timer 2
Timer 1
Timer 2
÷ 2
SMOD1
PCON.7
0
1
4235K–8051–05/08
Clock Source
UART Rx
INT_BRG
INT_BRG
INT_BRG
Timer 1
Timer 1
Timer 2
Timer 2
Timer 1
Timer 2
INT_BRG