AT80C51RD2-SLRUM Atmel, AT80C51RD2-SLRUM Datasheet - Page 38

• Manufacturer Part Number: AT80C51RD2-SLRUM
• Description: IC MCU 80C51 HI PERFORM 44PLCC
• Manufacturer: Atmel
• Series: 80Cr

Specifications of AT80C51RD2-SLRUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Processor Series: AT80x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 1280 B
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 32
• 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: 44PLCC
• Device Core: 8051
• Family Name: AT80
• Maximum Speed: 40 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

11.3.1
Figure 11-5. Internal Baud Rate
38
AT80C51RD2
Internal Baud Rate Generator (BRG)
Peripheral clock
BRR
Table 11-3.
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.
• The baud rate for UART is token by formula:
(T2CON)
BaudRate
(
TCLK
BRL
X
X
X
0
1
0
1
0
1
)
=
Baud Rate Selection Table UART
/6
256
=
--------------------------------------------------------------------------------------------------------- -
2
–
(T2CON)
×
---------------------------------------------------------------------------------------- -
2
RCLK
2
×
X
X
X
0
0
1
1
0
1
SPD
×
0
1
2
6
2
×
auto reload counter
〈
SMOD1
2
6
1 SPD
SMOD
(
–
1 SPD
–
×
(BDRCON)
×
〉
F
)
F
BRG
BRL
TBCK
×
×
CLKPERIPH
CLKPERIPH
0
0
0
0
1
1
0
0
1
16
16
×
×
overflow
[
BaudRate
256
–
(BDRCON)
(
BRL
RBCK
0
0
0
0
0
0
1
1
1
)
]
/2
Clock Source
0
1
INT_BRG
INT_BRG
INT_BRG
UART Tx
Timer 1
Timer 2
Timer 1
Timer 2
Timer 1
Timer 2
INT_BRG
4113D–8051–01/09
Clock Source
UART Rx
INT_BRG
INT_BRG
INT_BRG
Timer 1
Timer 1
Timer 2
Timer 2
Timer 1
Timer 2