CHAPTER 2 PIN FUNCTIONS43User’s Manual U11302EJ4V0UM2.3 Pin I/O Circuits and Recommended Connection of Unused PinsTable 2-1 shows the I/O circuit types of pins and the recommended connections of unused pins.Refer to Figure 2-1 for the configuration of the I/O circuit of each type.Table 2-1. Types of Pin I/O Circuits (1/2)Pin Name I/O I/O Recommended Connection of Unused PinsCircuit TypeP00/INTP0/TI0 2 Input Connect to V SS .P01/INTP1 8-A I/O Input: Independently connect to V SS via a resistor.P02/INTP2 Output: Leave open.P03/INTP3P04/XT1 16 Input Connect to V DD or V SS .P10/ANI0 to P17/ANI7 11 I/O Input: Independently connect to VDD or V SS via a resistor.P20/SI1 8-A Output: Leave open.P21/SO1 5-AP22/SCK1 8-AP23/STB 5-AP24/BUSY 8-AP25/SI0/SB0 10-AP26/SO0/SB1P27/SCK0Mask ROM versionP30/TO0 5-C I/O Input: Independently connect to V DD or V SS via a resistorNote.P31/TO1 Output: Leave open.P32/TO2P33/TI1 8-BP34/TI2P35/PCL 5-CP36/BUZP37Note Leave open when an on-chip pull-down resistor is specified by the mask option.
