the PC   'wwww wyyy yyyy yyyy' 'iloc' in my code
The bits '00001' is the base opcode for AJMP 'field'
the bits 'abc' are the bits 8..10 of the operand expression 'v'
the bits 'xxxxxxxx' are the bits 0..7 of the operand expression 'v'

the bits 'wwwww' are implied by the location counter.