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TMS570LS3137: about N2HET application of instructions

Part Number: TMS570LS3137

Hello 

I see the paper SPNA178–April2015,example 1

The following instructions

; The data fieldof the MOV32instruction contains an initial value(0x5)that
; is not equalto the key to unlock the N2HETprogram. Firstthe MOV32
; instruction movesthe initial valueto a temporarayregister T
L00 MOV32{ remote=DUMMY,type=IMTOREG,reg=T,data=0x5};
; Compare the register T valuewith the key to unlock N2HET. The key to unlock
; is 0xA. If the key is not matched then go back to L00. The CPU is supposed
; to writethe proper key (0xA)to unlock the N2HET
L01 ECMP { next=L00,hr_lr=LOW,cond_addr=L02,pin=0,reg=T,data=UNLOCK_KEY}

The ECMP instruction ,L01, Where is the value of this T register passed.

The L00 set the T reg the 0x05 value, but the L01 judge the reg T value whether is equal the 0xA,

Where did this T reg value change? Main program or where