AT89C51RE2-SLRUM Atmel, AT89C51RE2-SLRUM Datasheet - Page 100
AT89C51RE2-SLRUM
Manufacturer Part Number
AT89C51RE2-SLRUM
Description
MCU 8051 128K FLASH 44-PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51RE2-SLSUM.pdf
(187 pages)
Specifications of AT89C51RE2-SLRUM
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
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
8K 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
Processor Series
AT89x
Core
8051
Data Bus Width
8 bit
Data Ram Size
8 KB
Interface Type
UART, SPI
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
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
AT89OCD-01
For Use With
AT89STK-11 - KIT STARTER FOR AT89C51RX2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89C51RE2-SLRUM
Manufacturer:
Atmel
Quantity:
759
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Internal Baud Rate
Generator (BRG)
Figure 42. Internal Baud Rate generator 0
Figure 43. Internal Baud Rate generator 1
100
AT89C51RE2
BRR_1
BRR_0
F
F
PER
PER
The AT89C51RE2 implements two internal baudrate generators. Each one is dedicated to the
corresponding UART. The configuration and operating mode for both BRG are similar. When an
internal Baud Rate Generator is used, the Baud Rates are determined by the BRG overflow
depending on the BRL (BRL or BRL_1 registers) reload value, the value of SPD (or SPD_1) bit
(Speed Mode) in BDRCON (BDRCON_1) register and the value of the SMOD1 bit in PCON
register.
•
Baud_Rate =
BRL = 256 -
The baud rate for UART is token by formula:
6
6
(1-SPD)
(1-SPD)
/6
/6
2
2
SMOD1
SMOD1
⋅ 32 ⋅ Baud_Rate
⋅ 32 ⋅ (256 -BRL)
⋅ F
⋅ F
SPD_0
PER
PER
SPD_1
0
0
1
1
auto reload counter
auto reload counter
BRL_0
BRL_1
BRG
BRG
overflow
overflow
/2
/2
SMOD1
SMOD1_1
0
0
1
1
INT_BRG
INT_BRG1
7663E–8051–10/08
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