T89C51CC02UA-SITIM Atmel, T89C51CC02UA-SITIM Datasheet - Page 3

• Manufacturer Part Number: T89C51CC02UA-SITIM
• Description: IC 8051 MCU FLASH 16K 28PLCC
• Manufacturer: Atmel
• Series: AT89C CANr

Specifications of T89C51CC02UA-SITIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: CAN, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 512 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: 28-PLCC
• For Use With: AT89STK-06 - KIT DEMOBOARD 8051 MCU W/CAN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: T89C51CC02UASITIM

Active UART Bootloader Errata List
• Timer 2 and UART Are Not De-activated
• Watchdog and Flash API Starting the Bootloader Execution
• Autobaud False Start Bit Detection
• Flash API “__api_wr_code_page” with 0 Data in Length Parameter Field
UART Bootloader Errata History
UART Bootloader Errata Description
1. Timer 2 and UART Are Not De-activated
2. Watchdog and Flash API Starting the Bootloader Execution
3. Autobaud False Start Bit Detection
4160B–CAN–12/02
Version Number
1.2
When the bootloader receives the command “Start Application” (LJMP 0), the Timer 2 and the UART are not de-
activated.
Workaround
The application must have in its setup function a reset of Timer 2 and UART.
When an application using the watchdog starts the bootloader by calling the Flash APIs __api_start_bootloader or
__api_start_isp, when the watchdog overflows it will restart the application.
Workaround
Before calling the Flash APIs __api_start_bootloader or __api_start_isp, the fuse bit BLJB must be set.
The workaround is to call the Flash API __api_set_BLJB to wait the watchdog overflows to start in the bootloader.
UART autobaud sequence does not work on some special UARTs.
Some laptops have the UART TX line set to 0 when unused (COM port closed), this results in a false baud rate calcu-
lation on the ‘U’ character.
The autobaud sequence checkes for a ‘0’ state (not a falling edge) on the Rx line of the UART microcontroller to detect
the ‘start’ bit of the ‘U’ synchro character.
As this line is ‘0’ by default when COM port is closed, the autobaud routine starts its baudrate calculation at the opening
sequence of the UART.
Workaround
A ‘Special Sync’ can be used with ‘FLIP’ software.
In this case, the open port event and the ‘U’ sent are dissociated. The user must first open his COM port with the ‘con-
nect’ button, then reset its hardware and finally push the ‘sync’ button.
mov SCON, #00h
mov T2CON, #00h
mov RCAP2L, #00h
mov RCAP2H, #00h
mov TL2, #00h
mov TH2, #00h
Errata List
1, 2, 3, 4
3