131CHAPTER 6 PORT FUNCTIONSP00/INTP0/TI00,P07/XT1RDInternal busFigure 6-2. P00 and P07 Block DiagramFigure 6-3. P01 to P06 Block DiagramPUO : Pull-up resistor option registerPM : Port mode registerRD : Port 0 read signalWR : Port 0 write signalP-chWR PMWR PORTRDWRPUOAV DDP01/INTP1/TI01.P02/INTP2toP06/INTP6SelectorPUO0Output Latch(P01 to P06)PM01 to PM06Internal bus