AT89C51RB2-RLTIM Atmel, AT89C51RB2-RLTIM Datasheet - Page 48
AT89C51RB2-RLTIM
Manufacturer Part Number
AT89C51RB2-RLTIM
Description
IC 8051 MCU FLASH 16K 44VQFP
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51RB2-RLTIL.pdf
(127 pages)
Specifications of AT89C51RB2-RLTIM
Core Processor
8051
Core Size
8-Bit
Speed
60MHz
Connectivity
SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
32
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
1.25K 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
For Use With
AT89STK-11 - KIT STARTER FOR AT89C51RX2
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
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Internal Baud Rate Generator
(BRG)
Figure 21. Internal Baud Rate
48
AT89C51RB2/RC2
Table 32. 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 =
F
BRL = 256 -
Clk Periph
(T2CON)
The baud rate for UART is token by formula:
TCLK
0
1
0
1
X
X
0
1
X
6
6
(1-SPD)
(1-SPD)
÷ 6
2
2
(T2CON)
SMOD1
SMOD1
⋅ 32 ⋅ Baud_Rate
⋅ 32 ⋅ (256 -BRL)
RCLK
BDRCON.1
X
X
X
0
0
1
1
0
1
SPD
⋅ F
⋅ F
0
1
PER
PER
BDRCON.4
(BDRCON)
BRR
TBCK
0
0
0
0
1
1
0
0
1
(8 bits)
(8 bits)
BRG
BRL
(BDRCON)
RBCK
0
0
0
0
0
0
1
1
1
Overflow
Clock Source
UART Tx
INT_BRG
INT_BRG
INT_BRG
÷ 2
Timer 1
Timer 2
Timer 1
Timer 2
Timer 1
Timer 2
SMOD1
PCON.7
0
1
4180E–8051–10/06
Clock Source
UART Rx
INT_BRG
INT_BRG
INT_BRG
Timer 1
Timer 1
Timer 2
Timer 2
Timer 1
Timer 2
INT_BRG
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