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The procedures to initializes TM 4 C Port B , so pins 1 , 2 , 3 , 4 as input and the rest are

The procedures to initializes TM4C Port B, so pins 1,2,3,4 as input and the rest are output is?
LDR R0, GPIO_PORTB_DIR_R
MOVB R1,#%11110000
STR R1,[R0]
LDR RO, PORTB
MOVB R1,#%11110000
STR R1,[R0]
LDR RO, GPIO_PORTB_DIR_R *
MOVB R1,#%11100001
STR R1,[R0]
LDR RO, GPIO_PORTB_DIR_R
MOVB R1,#%10101010
STR R1,[R0]
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