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AVR32UC Datasheet(PDF) 7 Page - ATMEL Corporation |
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AVR32UC Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 118 page  7 32002C–AVR32–11/07 AVR32 Figure 2-2. The Status Register high halfword Figure 2-3. The Status Register low halfword DM - Debug State Mask If this bit is set, the Debug State is masked and cannot be entered. The bit is cleared at reset, and can both be read and written by software. D - Debug State The processor is in debug state when this bit is set. The bit is cleared at reset and should only be modified by debug hardware, the breakpoint instruction or the retd instruction. Undefined behav- iour may result if the user tries to modify this bit using other mechanisms. M2, M1, M0 - Execution Mode These bits show the active execution mode. The settings for the different modes are shown in Table 2-1 on page 8. M2 and M1 are cleared by reset while M0 is set so that the processor is in supervisor mode after reset. These bits are modified by hardware when initiating interrupt or exception processing. Execution of the scall, rets or rete instructions will also change these bits. Undefined behaviour may result if the user tries to modify these bits using the mtsr, ssrf or csrf instructions. If software needs to change these bits, scall, rets or rete should be used, possibly with prior modifications of the stack, to achieve the desired changes in a safe way. Refer to the AVR32 Architecture Manual for the behaviour of these instructions, note especially how the stack is modified after their execution. Bit 31 0 0 0 Bit 16 Interrupt Level 0 Mask Interrupt Level 1 Mask Interrupt Level 3 Mask Interrupt Level 2 Mask 1 0 0 0 0 1 1 0 0 0 0 0 0 FE I0M GM M1 - D M0 EM I2M DM - M2 LC 1 - Initial value Bit name I1M Mode Bit 0 Mode Bit 1 - Mode Bit 2 Reserved Debug State - I3M Reserved Exception Mask Global Interrupt Mask Debug State Mask Bit 15 Bit 0 Reserved Carry Zero Sign 0 0 0 0 0 0 0 0 0 0 0 0 0 0 - - - - T - Bit name Initial value 0 0 L Q V N Z C - Overflow Saturation - - - Lock Reserved Scratch |
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Similar Description - AVR32UC |
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