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AVR32UC Datasheet(PDF) 11 Page - ATMEL Corporation |
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AVR32UC Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 159 page  11 32002F–03/2010 AVR32 T - Scratch bit This bit is not set or cleared implicit by any instruction and the programmer can therefore use this bit as a custom flag to for example signal events in the program. This bit is cleared at reset. L - Lock flag Used by the conditional store instruction. Used to support atomical memory access. Automati- cally cleared by rete. This bit is cleared after reset. Q - Saturation flag The saturation flag indicates that a saturating arithmetic operation overflowed. The flag is sticky and once set it has to be manually cleared by a csrf instruction after the desired action has been taken. See the Instruction set description for details. V - Overflow flag The overflow flag indicates that an arithmetic operation overflowed. See the Instruction set description for details. N - Negative flag The negative flag is modified by arithmetical and logical operations. See the Instruction set description for details. Z - Zero flag The zero flag indicates a zero result after an arithmetic or logic operation. See the Instruction set description for details. C - Carry flag The carry flag indicates a carry after an arithmetic or logic operation. See the Instruction set description for details. 2.5 System registers The system registers are placed outside of the virtual memory space, and are only accessible using the privileged mfsr and mtsr instructions. Some of the System Registers can be altered automatically by hardware. The table below lists the system registers specified in AVR32UC. The programmer is responsible for maintaining correct sequencing of any instructions following a mtsr instruction. Table 2-2. System Registers Reg # Address Name Function 0 0 SR Status Register 1 4 EVBA Exception Vector Base Address 2 8 ACBA Application Call Base Address 3 12 CPUCR CPU Control Register 4 16 ECR Exception Cause Register 5 20 RSR_SUP Unused in AVR32UC 6 24 RSR_INT0 Unused in AVR32UC 7 28 RSR_INT1 Unused in AVR32UC |
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