T89C51RD2-RDTIL Atmel, T89C51RD2-RDTIL Datasheet - Page 66

• Manufacturer Part Number: T89C51RD2-RDTIL
• Description: IC MICRO CTRL 64K FLASH 64VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of T89C51RD2-RDTIL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 48
• 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): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Full Chip Erase
Checksum Error
Flow Description
Overview
Communication Initialization
66
T89C51RD2
The ISP command "Full Chip Erase" erases all User Flash memory (fills with FFh) and
sets some Bytes used by the bootloader at their default values:
•
•
•
The Full Chip Erase does not affect the bootloader.
When a checksum error is detected send ‘X’ followed with CR&LF.
An initialization step must be performed after each Reset. After microcontroller reset,
the bootloader waits for an autobaud sequence ( see section ‘autobaud performance’).
When the communication is initialized the protocol depends on the record type
requested by the host.
FLIP, a software utility to implement ISP programming with a PC, is available from the
Atmel the web site.
The host initializes the communication by sending a ’U’ character to help the bootloader
to compute the baudrate (autobaud).
Figure 25. Initialization
BSB = FFh
SBV = FCh
SSB = FFh and finally erase the Software Security Bits
Communication Opened
Init Communication
Else
If (not received "U")
Host
"U"
"U"
Sends Back ‘U’ Character
Performs Autobaud
Bootloader
4243G–8051–05/03