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M32C/8B 数据表(PDF) 125 Page - Renesas Technology Corp |
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M32C/8B 数据表(HTML) 125 Page - Renesas Technology Corp |
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125 / 406 page  Under development M32C/8B Group 11. Interrupts Preliminary specification Specifications in this manual are tentative and subject to change. REJ09B0450-0050 Rev.0.50 Oct 31, 2008 Page 108 of 385 11.6.5 IPL Change when Interrupt Request is Acknowledged When a peripheral function interrupt request is acknowledged, the priority level for the acknowledged interrupt becomes the IPL level in the flag register. Software interrupts and special interrupts have no interrupt priority level. If an interrupt that has no interrupt priority level occurs, the value shown in Table 11.6 becomes the IPL level. Table 11.6 Interrupts without Interrupt Priority Levels and IPL 11.6.6 Saving a Register In the interrupt sequence, values of the FLG register and PC are saved to the stack. Figure 11.8 shows the stack states before and after an interrupt request is acknowledged. The other necessary registers are saved by a program at the beginning of the interrupt routine. The PUSHM instruction can save multiple registers(1) in the register bank currently used. Refer to 11.4 High-Speed Interrupt for the high-speed interrupt. NOTE: 1. Selectable from registers R0, R1, R2, R3, A0, A1, SB, and FB. Figure 11.8 Stack States Before and After Acknowledgement of Interrupt Request Interrupt Source IPL level Watchdog timer, NMI, oscillation stop detection, voltage monitor, DMACII end-of-transfer interrupt 7 Software, address match Not changed [SP] SP value before an interrupt is generated Stack state before an interrupt request is acknowledged Stack state after an interrupt request is acknowledged PCL: 8 low-order bits of PC PCM: 8 middle-order bits of PC PCH: 8 high-order bits of PC FLGL: 8 low-order bits of FLG FLGH: 8 high-order bits of FLG Address m m - 1 m - 2 m - 3 m - 4 m + 1 m - 5 m - 6 Previous stack contents Previous stack contents Stack MSB LSB 00h FLGL Previous stack contents PCH Previous stack contents [SP] New SP value m + 1 Address Stack PCM PCL MSB LSB m - 5 m - 6 m m - 1 m - 2 m - 3 m - 4 FLGH |
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