AT89C51ID2-RLTUM Atmel, AT89C51ID2-RLTUM Datasheet - Page 56

• Manufacturer Part Number: AT89C51ID2-RLTUM
• Description: IC 8051 MCU FLASH 64K 44VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51ID2-RLTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• 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: 44-TQFP, 44-VQFP
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: UART, SPI, TWI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 34
• Number Of Timers: 3
• 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
• Package: 44VQFP
• Device Core: 8051
• Family Name: 89C
• Maximum Speed: 40 MHz
• Height: 1.45 mm
• Length: 10.1 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 10.1 mm
• 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: Details

Internal Baud Rate Generator
(BRG)
Figure 24. Internal Baud Rate
4289C–8051–11/05
BRR
F
PER
Table 37. 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 =
BRL = 256 -
(T2CON)
The baud rate for UART is token by formula:
TCLK
X
X
X
0
1
0
1
0
1
/6
6
6
(1-SPD)
(1-SPD)
2
2
SPD
(T2CON)
SMOD1
SMOD1
0
1
⋅ 32 ⋅ Baud_Rate
⋅ 32 ⋅ (256 -BRL)
RCLK
X
X
X
0
0
1
1
0
1
auto reload counter
⋅ F
⋅ F
PER
PER
BRG
BRL
(BDRCON)
TBCK
0
0
0
0
1
1
0
0
1
overflow
(BDRCON)
RBCK
/2
0
0
0
0
0
0
1
1
1
SMOD1
0
1
Clock Source
UART Tx
INT_BRG
INT_BRG
INT_BRG
Timer 1
Timer 2
Timer 1
Timer 2
Timer 1
Timer 2
AT89C51ID2
INT_BRG
Clock Source
UART Rx
INT_BRG
INT_BRG
INT_BRG
Timer 1
Timer 1
Timer 2
Timer 2
Timer 1
Timer 2
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