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HD6432351 датащи(PDF) 114 Page - Renesas Technology Corp |
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HD6432351 датащи(HTML) 114 Page - Renesas Technology Corp |
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114 / 1025 page ![]() Section 4 Exception Handling Rev. 3.00 Sep 15, 2006 page 80 of 988 REJ09B0330-0300 4.1.2 Exception Handling Operation 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 pushed onto the stack. 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 starts from that address. For a reset exception, steps 2 and 3 above are carried out. 4.1.3 Exception Vector Table 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. Exception sources Reset Trace Interrupts Trap instruction Power-on reset Manual reset External interrupts: NMI, IRQ7 to IRQ0 Internal interrupts: 42 interrupt sources in on-chip supporting modules Figure 4.1 Exception Sources In modes 6 and 7 in the H8S/2351, the on-chip ROM available for use after a power-on reset is the 64-kbyte area comprising addresses H'000000 to H'00FFFF. Care is required when setting vector addresses. |
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