ARM, Debug Simulator, Controller Area Network (CAN)

There is project for AT91SAM7X256.
Step first: we take datasheet example of the doc6120.pdf (Atmel AT91 ARM Thumb-based Microcontrollers on page 507-508).
Example of bit timing determination for CAN baudrate of 500 Kbit/s:
BRP = 5, PROPAG = 2, PHASE1 = PHASE2 = 5, SJW = 3, i.e.

void main(void){
....
CAN_BR = 0x00053255;
....
}

Step second: compile and run debugger simulator.
But if look at Peripherals->CAN -> CAN Controller, that in Settings view 533333 baud, instead of 500000.
Than this explain?

P.S.: Keil mdk 3.20, MCK=48.000000MHz.