14.5.6 Port B Data Direction Register

Name: DDRB
Offset: 0x05
Reset: 0x00

Bit 76543210 
     DDRBn[3:0] 
Access R/WR/WR/WR/W 
Reset 0000 

Bits 3:0 – DDRBn[3:0] Port B Input Pins Address [n = 3:0]