SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
The C28x CPU has fourteen peripheral interrupt lines. Two of the interrupt lines (INT13 and INT14) are connected directly to CPU timers 1 and 2, respectively. The remaining twelve interrupt lines are connected to peripheral interrupt signals through the enhanced Peripheral Interrupt Expansion module (ePIE, or PIE as a shortened version). The PIE multiplexes up to sixteen peripheral interrupts into each CPU interrupt line and also expands the vector table to allow each interrupt to have an ISR. This allows the CPU to support a large number of peripherals.
An interrupt path is divided into three stages: the peripheral, the PIE, and the CPU. Each stage has enable and flag registers. This system allows the CPU to handle one interrupt while others are pending, implement and prioritize nested interrupts in software, and disable interrupts during certain critical tasks.
Figure 3-1 shows the interrupt architecture for this device.