T89C51RD2-SLSIM Atmel, T89C51RD2-SLSIM Datasheet - Page 67

• Manufacturer Part Number: T89C51RD2-SLSIM
• Description: IC MICRO CTRL 64K FLASH 44PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of T89C51RD2-SLSIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Autobaud Performances
Table 39. Autobaud Performances (Bootloader Revision 2.4)
4243G–8051–05/03
Frequency (MHz)
Baudrate (bit/s)
4800
9600
19200
38400
57600
115200
Frequency (MHz)
Baudrate (bit/s)
4800
9600
19200
38400
57600
115200
1.8432
10
OK
OK
OK
OK
OK
OK
-
-
-
-
-
-
The ISP feature allows a wide range of baud rates in the user application. It is also
adaptable to a wide range of oscillator frequencies. This is accomplished by measuring
the bit-time of a single bit in a received character. This information is then used to pro-
gram the baud rate in terms of timer counts based on the oscillator frequency. The ISP
feature requires that an initial character (an uppercase U) be sent to the T89C51RD2 to
establish the baud rate. Table 39 shows the autobaud capability.
11.0592
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
2
-
-
2.4576
OK
OK
OK
12
OK
OK
OK
OK
-
-
-
-
-
14.318
OK
OK
OK
OK
OK
OK
OK
3
-
-
-
3.6864
14.746
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
-
OK
OK
OK
OK
16
OK
OK
OK
4
-
-
-
-
20
OK
OK
OK
OK
OK
OK
5
-
-
-
-
-
OK
OK
OK
OK
24
OK
OK
OK
OK
6
-
-
-
-
T89C51RD2
7.3728
26.6
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
-
-
32
OK
OK
OK
OK
OK
OK
OK
8
-
-
-
-
-
67