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W78E052DDG Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers

Part # W78E052DDG
Description  8-bit microcontroller
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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W78E054D/W78E052D Data Sheet
Publication Release Date: Jun 9, 2015
- 10 -
Revision A13
Pin Description, continued
SYMBOL
TYPE DESCRIPTIONS
P3.0
P3.7
I/O H
PORT 3: Port 3 is a bi-directional I/O port with internal pull-ups. All bits have al-
ternate functions, which are described below:
RXD (P3.0): Serial Port 0 input
TXD (P3.1): Serial Port 0 output
INT0 (P3.2) : External Interrupt 0
INT1 (P3.3) : External Interrupt 1
T0 (P3.4) : Timer 0 External Input
T1 (P3.5) : Timer 1 External Input
WR (P3.6) : External Data Memory Write Strobe
RD (P3.7) : External Data Memory Read Strobe
P4.0
P4.3
I/O H
PORT 4: 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 port or external interrupt
input sources ( INT2 / INT3 ).
* Note: TYPE I: input, O: output, I/O: bi-directional, H: pull-high, L: pull-low, D: open drain.
In application if MCU pins need external pull-up, it is recommended to add a pull-up resistor
(10K
) between pin and power (V
DD) instead of directly wiring pin to VDD for enhancing EMC.


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