T89C51CC01UA-RLTIM Atmel, T89C51CC01UA-RLTIM Datasheet - Page 4

• Manufacturer Part Number: T89C51CC01UA-RLTIM
• Description: IC 8051 MCU FLASH 32K 44VQFP
• Manufacturer: Atmel
• Series: AT89C CANr

Specifications of T89C51CC01UA-RLTIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: CAN, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• For Use With: AT89STK-06 - KIT DEMOBOARD 8051 MCU W/CAN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: T89C51CC01UARLTIM

16. EEPROM
4
Program lock-up can be experienced when using Atmel FLIP software or a custom In system Pogramming tools to
write in the internal EEPROM. This problem occurs with clock frequency > 12MHz in X2 mode or 24MHz in X1 mode.
Neither the code Flash nor the EEPROM are corrupted by the lock-up. Although the EEPROM cannot be written by the
bootloader.
This problem does not affect the capability to erase, read and write into the code Flash and the additional bytes with In-
System Programming as Atmel FLIP.
This problem is bootloader related and doesn’t affect the capability for the user to read and write into the EEPROM.
This problem is technology dependant. The likelyhood of experiencing the problem is low at Clock frequency > 24 MHz
in X1 mode and non-existent below. A reset can be applied to recover from the lock-up.
Workaround
The following process can be done to work around the problem.
C Init EEPROM program example:
T89C51CC01 Errata Sheet
–
Lock-up during ISP write
#define SIZE_EEPROM 12
unsigned char code
tab_eep[SIZE_EEPROM]={0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,0x99,0xAA};
void main (void)
{
address =0x00;
for (cpt=0; cpt<SIZE_EEPROM; cpt++)
unsigned char xdata * address;
unsigned char cpt;
EEPROM program in
Start the bootloader
EEPROM program
Download a Final
program in flash
Download a Init
flash memory
Start this init
Re-Start the
bootloader
memory
- With hardware condition
- With "start application"
command
- With "start application"
command
- With hardware condition
4131J–CAN–05/06