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ARM60 Datasheet(PDF) 62 Page - Zarlink Semiconductor Inc |
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ARM60 Datasheet(HTML) 62 Page - Zarlink Semiconductor Inc |
62 / 120 page P60ARM-B 58 specify the operation the coprocessor is required to perform, CRn is the coprocessor register which is the source or destination of the transferred information, and CRm is a second coprocessor register which may be involved in some way which depends on the particular operation specified. 4.13.2 Transfers to R15 When a coprocessor register transfer to ARM60 has R15 as the destination, bits 31, 30, 29 and 28 of the transferred word are copied into the N, Z, C and V flags respectively. The other bits of the transferred word are ignored, and the PC and other CPSR bits are unaffected by the transfer. 4.13.3 Transfers from R15 A coprocessor register transfer from ARM60 with R15 as the source register will store the PC+12. 4.13.4 Instruction Cycle Times MRC instructions take 1S + bI +1C incremental cycles to execute, where S, I and C are as defined in section 5.1 Cycle types on page 65. MCR instructions take 1S + (b+1)I +1C incremental cycles to execute. b is the number of cycles spent in the coprocessor busy-wait loop. 4.13.5 Assembler syntax <MCR|MRC>{cond} p#,<expression1>,Rd,cn,cm{,<expression2>} MRC - move from coprocessor to ARM60 register (L=1) MCR - move from ARM60 register to coprocessor (L=0) {cond} - two character condition mnemonic, see Figure 6: Condition Codes p# - the unique number of the required coprocessor <expression1> - evaluated to a constant and placed in the CP Opc field Rd is an expression evaluating to a valid ARM60 register number cn and cm are expressions evaluating to the valid coprocessor register numbers CRn and CRm respectively <expression2> - where present is evaluated to a constant and placed in the CP field 4.13.6 Examples MRC 2,5,R3,c5,c6 ; request coproc 2 to perform operation 5 ; on c5 and c6, and transfer the (single ; 32 bit word) result back to R3 MCR 6,0,R4,c6 ; request coproc 6 to perform operation 0 ; on R4 and place the result in c6 |
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