AT89C51CC02 Atmel Corporation, AT89C51CC02 Datasheet - Page 4

• Manufacturer Part Number: AT89C51CC02
• Manufacturer: Atmel Corporation

Specifications of AT89C51CC02

• Flash (kbytes): 16 Kbytes
• Max. Operating Frequency: 40 MHz
• Cpu: 8051-12C
• Max I/o Pins: 20
• Uart: 1
• Can: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 0.5
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART/CAN
• Watchdog: Yes

14. Timer1
4
Workaround implementation
The workaround is to have the last MOb (MOb3) as "spy" enabled all the time; it is the MOb of lowest priority : If a Mob
other than MOb3 is programmed in receive mode and its acceptance filter matches with the incoming message ID, this
Mob will take the message. MOb3 will only take messages than no other MObs will have accepted. MOb3 will need to
be re-enabled fast enough to manage back to back frames. The deadline to do this is the beginning of DLC slot of
incoming frames as explained above.
Minimum code to insert in CAN interrupt routine:
The timer1, when used as a baud rate generator in mode 1 (16 bits counter) for low baud rates, does not generate
baud rate to UART.
Workaround
No
.
T89C51CC02 Errata Sheet
–
in Mode 1 Does Not Generate Baud Rate to UART
__interrupt void can_int_handler(void)
{
if ((CANSIT & 0x08) == 0x08 )
........
........
}
{
CANPAGE = (0x03);
CANSTCH = 0x00;
CANCONCH = 0x88;
}
CAN2.0A
CAN2.0B
T 1
T 1
T 1
T 1
T 1
T 1
/* reception enable */
/* select MOb3 */
/* reset MOb3 status */
19 bit time minimum
/* MOb3 interrupt
39 bit time minimum
T 2
T 2
T 2
(SIT3=1) */
4160F–CAN–05/06
T 2
T 2
T 2