configure PA0 (center), PA1 (left), PA2 (right), PA3(up), PA5(down) as pull-down

PUPDR1511:0] PUPDR 14(1.0 PUPDR 13[1 0] 261 232 PUPDR 11 [10 PUPDR 1011 :0r201 PUPDR9(1 0) PUPDR6(1:01 PUPDR6(1:0] PUPDR5(1:0] PUPDR411:019 PUPDR2[1:0 PUPDR111:0) 2 PUPDRO[1:0] NO PUPD (00, reset), Pullup (01), Pulldown (10), Reserved (11 | Register in 27 26 25 24 -22 21 20 9 18 | -5 14 13 La 1 10 9LER-10- 76543 2-0 R- PUPDR Mask 0 Mask (Set) esired bit output (in HEX) GPIOE Pull-up Pull-down Register MASK ( Bitwise clear) Value = 0x- GPIOE Pull-up Pull-down Register MASK Bitwise set) Value = 0x 5