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write higher byte at address 0x10
(<=> MOV.B #0xA5, &P1OUT)
write lower byte at address 0x11
(<=> MOV.B #0xB6, &P1DIR)
write 16-bit word at address 0xB8
(<=> MOV #0xC7D8, &TAR)
read at address 0x10
(<=> MOV.B &P1OUT, r5)
read at address 0xB8
(<=> MOV &TAR, r7)
read at address 0x11
(<=> MOV.B &P1DIR, r6)