Datasheet
UM10398 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
User manual Rev. 12.3 — 10 June 2014 489 of 547
NXP Semiconductors
UM10398
Chapter 28: LPC111x/LPC11Cxx Appendix: ARM Cortex-M0 reference
See also Section 28–28.5.4.1.
28.5.5.1.3 Restrictions
Table 436
lists the legal combinations of register specifiers and immediate values that can
be used with each instruction.
28.5.5.1.4 Examples
The following shows two instructions that add a 64-bit integer contained in R0 and R1 to
another 64-bit integer contained in R2 and R3, and place the result in R0 and R1.
64-bit addition:
ADDS R0, R0, R2 ; add the least significant words
ADCS R1, R1, R3 ; add the most significant words with carry
Multiword values do not have to use consecutive registers. The following shows
instructions that subtract a 96-bit integer contained in R1, R2, and R3 from another
contained in R4, R5, and R6. The example stores the result in R4, R5, and R6.
96-bit subtraction:
SUBS R4, R4, R1 ; subtract the least significant words
SBCS R5, R5, R2 ; subtract the middle words with carry
SBCS R6, R6, R3 ; subtract the most significant words with carry
The following shows the RSBS instruction used to perform a 1's complement of a single
register.
Arithmetic negation:
RSBS R7, R7, #0 ; subtract R7 from zero
28.5.5.2 AND, ORR, EOR, and BIC
Logical AND, OR, Exclusive OR, and Bit Clear.
Table 436. ADC, ADD, RSB, SBC and SUB operand restrictions
Instruction Rd Rn Rm imm Restrictions
ADCS R0-R7 R0-R7 R0-R7 - Rd and Rn must specify the same register.
ADD R0-R15 R0-R15 R0-PC - Rd and Rn must specify the same register.
Rn and Rm must not both specify PC.
R0-R7 SP or PC - 0-1020 Immediate value must be an integer multiple of four.
SP SP - 0-508 Immediate value must be an integer multiple of four.
ADDS R0-R7 R0-R7 - 0-7 -
R0-R7 R0-R7 - 0-255 Rd and Rn must specify the same register.
R0-R7 R0-R7 R0-R7 - -
RSBS R0-R7 R0-R7 - - -
SBCS R0-R7 R0-R7 R0-R7 - Rd and Rn must specify the same register.
SUB SP SP - 0-508 Immediate value must be an integer multiple of four.
SUBS R0-R7 R0-R7 - 0-7 -
R0-R7 R0-R7 - 0-255 Rd and Rn must specify the same register.
R0-R7 R0-R7 R0-R7 - -