w78l365a Winbond Electronics Corp America, w78l365a Datasheet - Page 5

• Manufacturer Part Number: w78l365a
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

4.
* Note: TYPE I: input, O: output, I/O: bi-directional, H: pull-high, L: pull-low, D: open drain
P0.0−P0.7
P1.0−P1.7
P2.0−P2.7
P3.0−P3.7
P4.0−P4.7
SYMBOL
XTAL1
XTAL2
PSEN
RST
ALE
V
V
EA
PIN DESCRIPTION
DD
SS
TYPE
I/O D PORT 0: Function is the same as that of standard 8052.
I/O H PORT 1: Function is the same as that of standard 8052.
I/O H
I/O H PORT 3: Function is the same as that of the standard 8052.
I/O H
O H
O H
I L
O
I
I
I
I
EXTERNAL ACCESS ENABLE: This pin forces the processor to execute the
external ROM. The ROM address and data will not be presented on the bus if
the EA pin is high.
PROGRAM STORE ENABLE: PS
Port 0 address/data bus. When internal ROM access is performed, no
strobe signal outputs originate from this pin.
ADDRESS LATCH ENABLE: ALE is used to enable the address latch that
separates the address from the data on Port 0. ALE runs at 1/6th of the
oscillator frequency.
RESET: A high on this pin for two machine cycles while the oscillator is
running resets the device.
CRYSTAL 1: This is the crystal oscillator input. This pin may be driven by an
external clock.
PORT 2: Port 2 is a bi-directional I/O port with internal pull-ups. This port also
provides the upper address bits for accesses to external memory. The P2.6
and P2.7 also provide the alternate function REBOOT which is H/W reboot
from LD flash.
PORT 4: A bi-directional I/O. The P4.3 also provide the alternate function
CRYSTAL 2: This is the crystal oscillator output. It is the inversion of XTAL1.
GROUND: ground potential.
POWER SUPPLY: Supply voltage for operation.
REBOOT which is H/W reboot from LD flash.
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DESCRIPTIONS
EN
enables the external ROM data in the
W78LE365/W78L365A
Publication Release Date: April 28, 2008
Revision A8
PS
EN