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W78E54P-24 Datasheet(PDF) 3 Page - Winbond |
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W78E54P-24 Datasheet(HTML) 3 Page - Winbond |
3 / 23 page W78E54 Publication Release Date: November 1997 - 3 - Revision A2 PIN DESCRIPTION The W78E54 has two operating modes, normal and flash. In normal mode, the W78E54 corresponds to the W78C54. In flash mode, the user (the maker of the flash EEPROM writer) can access the flash EEPROM. P0.7 −P0.0 Port 0, Bits 7−0 MODE DESCRIPTION Normal Port 0, Bits 0 through 7. Port 0 is a bidirectional I/O port. This port also provides a multiplexed low order address/data bus during accesses to external memory. Flash This port provides the data bus during access to the flash EEPROM. P1.7 −P1.0 Port 1, Bits 7−0 MODE DESCRIPTION Normal Port 1, Bits 0 through 7. Port 1 is a bidirectional I/O port with internal pull-ups. Pins P1.0 and P1.1 also serve as T2 (Timer 2 external input) and T2EX (Timer 2 capture/reload trigger), respectively. Flash This port provides the low-order address bus during access to the flash EEPROM. P2.7 −P2.0 Port 2, Bits 7−0 MODE DESCRIPTION Normal Port 2, Bits 0 through 7. Port 2 is a bidirectional I/O port with internal pull-ups. This port also provides the upper address bits for accesses to external memory.. Flash This port provides the high-order address bus during access to the flash EEPROM. P3.7 −P3.0 Port 3, Bits 7−0 MODE DESCRIPTION Normal Port 3, Bits 0 through 7. Port 3 is a bidirectional I/O port with internal pull-ups. All bits have alternate functions. Flash P3.3 −P3.0 and P3.7−P3.6 are the flash mode configuration pins, Input. P3.3 −P3.0 and P3.7−P3.6 are configured to select or execute the flash operations. For details, see Flash Operations. P4.3 −P4.0 Port 4, Bits 3−0 (available on 44-pin PLCC/QFP package) MODE DESCRIPTION Normal Another bit-addressable bidirectional I/O port P4. P4.3 and P4.2 are alternative function pins. It can be used as general I/O pins or external interrupt input sources ( INT2 / INT3 ). |
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