W78E54 データシートの表示（PDF） - Winbond

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W78E54

8-BIT MICROCONTROLLER

Winbond 

W78E54

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

Flash

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.

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 ).

Publication Release Date: November 1997

-3-

Revision A2

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