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UPD780204 Datasheet(PDF) 81 Page - NEC |
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UPD780204 Datasheet(HTML) 81 Page - NEC |
81 / 418 page CHAPTER 4 PORT FUNCTIONS 81 User’s Manual U11302EJ4V0UM Table 4-1. Port Functions (1/2) Pin Name Function Alternate Function P00 Input only. INTP0/TI0 P01 INTP1 P02 INTP2 P03 INTP3 P04 Input only. XT1 P10 to P17 Port 1. ANI0 to ANI7 8-bit I/O port. Input/output can be specified in 1-bit units. If used as an input port, on-chip pull-up resistors can be used by software settings. P20 SI1 P21 SO1 P22 SCK1 P23 STB P24 BUSY P25 SI0/SB0 P26 SO0/SB1 P27 SCK0 P30 TO0 P31 TO1 P32 TO2 P33 TI1 P34 TI2 P35 PCL P36 BUZ P37 – P70 to P74 Port 7. – N-ch open-drain 5-bit I/O port. Input/output can be specified in 1-bit units. LEDs can be driven directly. In mask ROM versions, use of pull-up resistors can be specified in 1-bit units with the mask option. P80 to P87 Port 8. FIP13 to FIP20 P-ch open-drain 8-bit high withstanding voltage output port. LEDs can be driven directly. In mask ROM versions, use of pull-down resistors can be specified in 1-bit units with the mask option (can be specified as connected to VLOAD or VSS in 4-bit units). P90 to P97 Port 9. FIP21 to FIP28 P-ch open-drain 8-bit high withstanding voltage output port. LEDs can be driven directly. In mask ROM versions, use of pull-down resistors can be specified in 1-bit units with the mask option (can be specified as connected to VLOAD or VSS in 4-bit units). Input/output can be specified in 1-bit units. If used as an input port, on-chip pull-up resistors can be used by software settings. Port 0. 5-bit I/O port. Port 2. 8-bit I/O port. Input/output can be specified in 1-bit units. If used as an input port, on-chip pull-up resistors can be used by software settings. Port 3. 8-bit I/O port. Input/output can be specified in 1-bit units. LEDs can be driven directly. If used as an input port, on-chip pull-up resistors can be used by software settings. In mask ROM versions, use of pull-down resistors can be specified in 1-bit units with the mask option. |
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