AT89C51CC03 Atmel Corporation, AT89C51CC03 Datasheet - Page 15

• Manufacturer Part Number: AT89C51CC03
• Manufacturer: Atmel Corporation

Specifications of AT89C51CC03

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 40 MHz
• Cpu: 8051-12C
• Max I/o Pins: 37
• Spi: 1
• Uart: 1
• Can: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 2.25
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART/CAN
• Watchdog: Yes

Example
Reading the Flash or
EEPROM Data
Requests from Host
Answers from
Bootloader
4251B–CAN–03/08
The flow described below allows the user to read data in the Flash memory or in the EEPROM
data memory. A blank check command on the Flash memory is possible with this flow.
This operation can be executed only with a device previously opened in communication.
To start the reading operation, the Host sends a “Display Data” CAN message (Id_display_data)
with the area memory selected, the start address and the end address passed in parameter.
The device splits into block of 8 bytes data to transfer to the Host if the number of data to display
is greater than 8 data bytes.
Note:
The device has two possible answers:
•
•
Answer to a read command:
If the chip is protected from read access a “Error” CAN message is sent (see Section “Error
Message Description”).
Otherwise:
for a display command the device start to send the data up to 8 by frame to the host. for a
blank check command the device send a result ok or the first address not erased.
Programming Data (write 55h from 0000h to 0008h in the flash), with SSB i
BOOTLOADER
HOST
Programming Data (write 55h from 0000h to 0008h in the flash)
HOST
BOOTLOADER
HOST
BOOTLOADER
HOST
BOOTLOADER
1.
2. The address_start gives the start address to read.
3. The address_end gives the last address to read.
ID_DISPLAY_DATA
D
- 00h: Display Flash
- 01h: Blank Check on the Flash
- 02h: Display EEPROM data
ata[0] selects the area to read and the operation
Identifier
ID_DISPLAY_DATA
Identifier
Id_prog_start
Id_error
Id_prog_start
Id_prog_start
Id_prog_data
Id_prog_data
Id_prog_data
Id_prog_data
identifier
identifier
Length
5
AT89C51CC03 CAN Bootloader
data[0]
00h
01h
02h
control
control
04
08
01
01
01
01
05
00
data[1]
address_start
00 00 00
55
02
55
00
00
00
Length
n
55
00
data
data
data[2]
// command_new_data
// command_ok
// error_security
55
00
08
55
00
55 55 55 55
08
data[3]
address_end
data[n]
x
data[4]
15