EZZE MASS2, Technical Manual, Page: 40 / 137

Model MASS 2 Version V_1.0
Prepared by H/W Date 22/01/2008
Subject Technical Manual Page 18/59
After the system has reset, the Boot Code guides the processor to run the Factory Programming software placed in
System ROM. Then, MT6225 starts and polls the UART1 port until valid information is detected. The first information
received on the UART1 is used to configure the chip for factory programming. The Flash downloader program is then
transferred into System RAM or external SRAM. Further information is detailed in the MT6228 Software Programming
Specification.
Figure 8. Factory Programming
3.3 Interrupt Controller
Figure 10 outlines the major functionality of the MCU Interrupt Controller. The interrupt controller processes all
interrupt sources coming from external lines and internal MCU peripherals. Since ARM7EJ-S core supports two levels
of interrupt latency, this controller generates two request signals: FIQ for fast, low latency interrupt request and IRQ for
more general interrupts with lower priority.
Figure 10. Block Diagram of Interrupt controller.