Maxim-integrated MAX31782 Manual do Utilizador descarregar pdf (Página 170)

Maxim Integrated 19-5

MAX31782 User’s Guide

Revision 0; 8/11

High (16-bit destination) ← 8-bit source

To modify only the high byte of a given 16-bit destination, the 16-bit register should be moved into the GR register such

that the low byte can be singulated and the high byte can be written exclusively. Additional cycles are required if the

destination index is greater than 0Fh or if the source index is greater than 0Fh.

move GR,DP[0] ;moveDP[0]totheGRregister

move PFX[0],#20h;getthehighbyteofDP[0]viaGRH

move DP[0],GRL ;storethenewDP[0]value

    ;16-bitdestinationsub-index:dst=10h

    ;8-bitsourcesub-index:src=11h

move PFX[1],#00h;

move GR,dst ;readdstwordtotheGRregister

move PFX[1],#00h

move PFX[4],src ;getthenewsrcbyte

move dst,GRL ;storethenewdstvalue

If the high byte needs to be cleared to 00h, the operation can be shortened by transferring only the GRL byte to the

16-bit destination (example follows):

move GR,DP[0] ;moveDP[0]totheGRregister

move DP[0],GRL ;storethenewDP[0]value,00husedforhighbyte

19.4 Reading and Writing Register Bits

The MOVE instruction can also be used to directly set or clear any one of the lowest 8 bits of a peripheral register in

module 0h-5h or a system register in module 8h. The set or clear operation will not affect the upper byte of a 16-bit

register that is the target of the set or clear operation. If a set or clear instruction is used on a destination register that

does not support this type of operation, the register high byte will be written with the prefix data and the low byte will

be written with the bit mask (i.e., all 0s with a single 1 for the set bit operation or all ones with a single 0 for the clear

bit operation).

move IGE,#1 ;setIGE(InterruptGlobalEnable)bit

move APC.6,#0 ;clearIDSbit(APC.6)

As with other instructions, prefixing is required to select destination registers beyond index 07h.

The MOVE instruction may also be used to transfer any one of the lowest 8 bits from a register source or any bit of the

active accumulator (Acc) to the Carry flag. There is no restriction on the source register module for the ‘MOVE C, src.

bit’ instruction.

move C,IIR.3 ;copyIIR.3toCarry

move C,Acc.7 ;copyAcc.7toCarry

Prefixing is required to select source registers beyond index 15h.

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Maxim-integrated MAX31782 Manual do Utilizador Página 170