AVR Instruction Set Nomenclature: Status Register (SREG ...

More documents

Recommendations

Info

Example: 100 lsr r19 ; Divide r19:r18 by two ror r18 ; r19:r18 is an unsigned two-byte integer brcc zeroenc1 ; Branch if carry cleared asr r17 ; Divide r17:r16 by two ror r16 ; r17:r16 is a signed two-byte integer brcc ... zeroenc2 ; Branch if carry cleared zeroenc1: nop ... ; Branch destination (do nothing) zeroenc1: nop ; Branch destination (do nothing) Words: 1 (2 bytes) Cycles: 1 Instruction Set
SBC - Subtract with Carry Instruction Set Description: Subtracts two registers and subtracts with the C flag and places the result in the destination register Rd. Operation: (i) Rd ← Rd - Rr - C Syntax: Operands: Program Counter: (i) SBC Rd,Rr 0 ≤ d ≤ 31, 0 ≤ r ≤ 31 PC ← PC + 1 16-bit Opcode: 0000 10rd dddd rrrr Status Register and Boolean Formula: I T H S V N Z C - - ⇔ ⇔ ⇔ ⇔ ⇔ ⇔ H: Rd3• Rr3 + Rr3• R3 + R3 •Rd3 Set if there was a borrow from bit 3; cleared otherwise S: N ⊕ V, For signed tests. V: Rd7 •Rr7• R7 +Rd7 •Rr7 •R7 Set if two’s complement overflow resulted from the operation; cleared otherwise. N: R7 Set if MSB of the result is set; cleared otherwise. Z: R7• R6 •R5• R4• R3 •R2• R1• R0• Z Previous value remains unchanged when the result is zero; cleared otherwise. C: Rd7 •Rr7+ Rr7 •R7 +R7 •Rd7 Set if the absolute value of the contents of Rr plus previous carry is larger than the absolute value of the Rd; cleared otherwise. R (Result) equals Rd after the operation. Example: sub r2,r0 ; Subtract r1:r0 from r3:r2 ; Subtract low byte sbc r3,r1 ; Subtract with carry high byte Words: 1 (2 bytes) Cycles: 1 101
Page 1 and 2:
Instruction Set Nomenclature: Statu
Page 3 and 4:
Conditional Branch Summary Instruct
Page 5 and 6:
Instruction Set Summary (Continued)
Page 7 and 8:
Instruction Set Summary (Continued)
Page 9 and 10:
ADC - Add with Carry Description: A
Page 11 and 12:
ADIW - Add Immediate to Word Instru
Page 13 and 14:
ANDI - Logical AND with Immediate I
Page 15 and 16:
BCLR - Bit Clear in SREG Descriptio
Page 17 and 18:
BRBC - Branch if Bit in SREG is Cle
Page 19 and 20:
BRCC - Branch if Carry Cleared Inst
Page 21 and 22:
BREQ - Branch if Equal Instruction
Page 23 and 24:
BRHC - Branch if Half Carry Flag is
Page 25 and 26:
BRID - Branch if Global Interrupt i
Page 27 and 28:
BRLO - Branch if Lower (Unsigned) I
Page 29 and 30:
BRMI - Branch if Minus Instruction
Page 31 and 32:
BRPL - Branch if Plus Instruction S
Page 33 and 34:
BRTC - Branch if the T Flag is Clea
Page 35 and 36:
BRVC - Branch if Overflow Cleared I
Page 37 and 38:
BSET - Bit Set in SREG Description:
Page 39 and 40:
CALL - Long Call to a Subroutine In
Page 41 and 42:
CBR - Clear Bits in Register Instru
Page 43 and 44:
CLH - Clear Half Carry Flag Descrip
Page 45 and 46:
CLN - Clear Negative Flag Descripti
Page 47 and 48:
CLS - Clear Signed Flag Description
Page 49 and 50: CLV - Clear Overflow Flag Descripti
Page 51 and 52: COM - One’s Complement Descriptio
Page 53 and 54: CPC - Compare with Carry Instructio
Page 55 and 56: CPSE - Compare Skip if Equal Instru
Page 57 and 58: EICALL - Extended Indirect Call to
Page 59 and 60: ELPM - Extended Load Program Memory
Page 61 and 62: ESPM - Extended Store Program Memor
Page 63 and 64: FMUL - Fractional Multiply Unsigned
Page 65 and 66: FMULSU - Fractional Multiply Signed
Page 67 and 68: IJMP - Indirect Jump Instruction Se
Page 69 and 70: INC - Increment Instruction Set Des
Page 71 and 72: LD - Load Indirect from data space
Page 73 and 74: LD (LDD) - Load Indirect from data
Page 75 and 76: LD (LDD) - Load Indirect From data
Page 77 and 78: LDI - Load Immediate Description: L
Page 79 and 80: LPM - Load Program Memory Instructi
Page 81 and 82: LSR - Logical Shift Right Instructi
Page 83 and 84: MOVW - Copy Register Word Instructi
Page 85 and 86: MULS - Multiply Signed Description:
Page 87 and 88: NEG - Two’s Complement Descriptio
Page 89 and 90: OR - Logical OR Instruction Set Des
Page 91 and 92: OUT - Store Register to I/O Locatio
Page 93 and 94: PUSH - Push Register on Stack Instr
Page 95 and 96: RET - Return from Subroutine Instru
Page 97 and 98: RJMP - Relative Jump Instruction Se
Page 99: ROR - Rotate Right through Carry In
Page 103 and 104: SBI - Set Bit in I/O Register Instr
Page 105 and 106: SBIS - Skip if Bit in I/O Register
Page 107 and 108: SBR - Set Bits in Register Instruct
Page 109 and 110: SBRS - Skip if Bit in Register is S
Page 111 and 112: SEH - Set Half Carry Flag Descripti
Page 113 and 114: SEN - Set Negative Flag Description
Page 115 and 116: SES - Set Signed Flag Description:
Page 117 and 118: SEV - Set Overflow Flag Description
Page 119 and 120: SLEEP Description: This instruction
Page 121 and 122: ST - Store Indirect From Register t
Page 123 and 124: ST (STD) - Store Indirect From Regi
Page 125 and 126: ST (STD) - Store Indirect From Regi
Page 127 and 128: STS - Store Direct to data space In
Page 129 and 130: SUBI - Subtract Immediate Instructi
Page 131 and 132: TST - Test for Zero or Minus Instru
Page 133: Atmel Headquarters Atmel Operations
show all

AVR Instruction Set Nomenclature: Status Register (SREG ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?