h8s2277 Renesas Electronics Corporation., h8s2277 Datasheet - Page 94

• Manufacturer Part Number: h8s2277
• Description: Hitachi Single-chip Microcomputer H8s/2276 Series
• Manufacturer: Renesas Electronics Corporation.

4.1.2
Exceptions originate from various sources. Trap instructions and interrupts are handled as
follows:
1. The program counter (PC), condition code register (CCR), and extended register (EXR) are
2. The interrupt mask bits are updated. The T bit is cleared to 0.
3. A vector address corresponding to the exception source is generated, and program execution
For a reset exception, steps 2 and 3 above are carried out.
4.1.3
The exception sources are classified as shown in figure 4.1. Different vector addresses are
assigned to different exception sources.
Table 4.2 lists the exception sources and their vector addresses.
72
pushed onto the stack.
starts from that address.
Exception Handling Operation
Exception Sources and Vector Table
Exception
sources
Reset
Trace
Direct transition
Interrupts
Trap instruction
Figure 4.1 Exception Sources
External interrupts: NMI, IRQ7 to IRQ0
Internal interrupts: 36 interrupt sources
in on-chip supporting modules