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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SH33F2801P/032PR 데이터시트(PDF) 12 Page - SINOWEALTH Electronic Ltd |
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SH33F2801P/032PR 데이터시트(HTML) 12 Page - SINOWEALTH Electronic Ltd |
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12 / 407 page  SH33F2801 12 7.3 Special-purpose Registers ARM Star Core also has several special registers on core level, as shown in the following table: Table7-1 ARM Star Core Special Registers and Their Functions Register Function xPSR Provide ALU flags (zero flag, carry flag, negative flag, overflow flag), execution status, and current executing interrupt number PRIMASK Disable all interrupts except the non-maskable interrupt(NMI) and Hard Fault FAULTMASK Disable all interrupts except the NMI BASEPRI Disable all interrupts of specific priority level or lower priority level CONTROL Define privilege status and stack pointer selection 7.3.1 Program Status Registers The program status registers are subdivided into three status registers. These three registers are: application PSR (APSR), interrupt PSR (IPSR), and execution PSR (EPSR). The three PSRs can be accessed together or separately using the special register access instructions MSR and MRS. When they are accessed as a collective item, the name xPSR is used. 7.3.1.1 Application PSR Application PSR (APSR) contains condition code flags. The ARM Star processor stores the condition code flags on the stack before entering the exception. You can read the APSR using MRS instruction and can change the APSR using the MSR instruction, but EPSR and IPSR are read-only. b31 b30 b29 b28 b27 b26 b25 b24 b23 b22 b21 b20 b19 b18 b17 b16 N Z C V Q Reserved RW RW RW RW RW - 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 Reserved - 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit Sign Description 31 N Negative 1: the result is negative 0: the result is positive 30 Z Zero 1: the result is 0 0: the result is not 0 29 C Carry/borrow 1: carry or borrow 0: no carry or borrow 28 V Overflow 1: overflow 0: no overflow 27 Q DSP Overflow and Sticky saturation flag 26 - 0 Reserved - |
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