AT80C51RD2-3CSUM Atmel, AT80C51RD2-3CSUM Datasheet - Page 38

• Manufacturer Part Number: AT80C51RD2-3CSUM
• Description: IC, 8BIT MCU, 80C51, 40MHZ, DIP-40
• Manufacturer: Atmel

Specifications of AT80C51RD2-3CSUM

• Controller Family/series: 80C51
• No. Of I/o's: 32
• Ram Memory Size: 1280Byte
• Cpu Speed: 40MHz
• No. Of Timers: 3
• No. Of Pwm Channels: 5
• Digital Ic Case Style: DIP
• Core Size: 8 Bit
• Rohs Compliant: Yes
• Processor Series: AT80x
• Core: 8051
• Data Bus Width: 8 bit
• Program Memory Type: ROMLess
• 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: + 70 C
• Mounting Style: Through Hole
• Package / Case: PDIL-40
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: 0 C
• Cpu Family: AT80
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 40MHz
• Program Memory Size: Not Required
• Total Internal Ram Size: 1.25KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 40
• Package Type: PDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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