word expression is to put a word value at the current position, this value is expression
Keywords：ARM
Reference address：ARM assembly pseudo-instructions: .word description
for example,
_rWTCON:
.word 0x15300000 ; is to put a value of 0x15300000 at the current address, that is, _rWTCON
Translated into Intel's assembly statement:
_rWTCON dw 0x15300000
For example:
ldr r1, _rWTCON
_rWTCON:
.word 0x15300000
Instead of transferring the content at address 0x1530 0000 to r1, the content at address _rWTCON is placed in r1, and the content at address _rWTCON is 0x15300000. In fact, r1 is set to 0x15300000
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