W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 9

• Manufacturer Part Number: W78E052DDG
• Description: IC MCU 8-BIT 8K FLASH 40-DIP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W78r

Specifications of W78E052DDG

• Core Processor: 8052
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: EBI/EMI, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 36
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

5
SYMBOL
ALE
RST
XTAL1
XTAL2
VSS
VDD
P0.0−P0.7
P1.0−P1.7
P2.0−P2.7
EA
PSEN
PIN DESCRIPTIONS
TYPE DESCRIPTIONS
I/O D
I/O H
I/O H
O H
O H
I L
O
I
I
I
I
EXTERNAL ACCESS ENABLE: This pin forces the processor to execute out of
external ROM. It should be kept high to access internal ROM. The ROM address
and data will not be present on the bus if EA pin is high and the program
counter is within internal ROM area. Otherwise they will be present on the bus.
PROGRAM STORE ENABLE: PSEN enables the external ROM data onto the
Port 0 address/data bus during fetch and MOVC operations. When internal ROM
access is performed, no PSEN strobe signal outputs from this pin.
ADDRESS LATCH ENABLE: ALE is used to enable the address latch that sepa-
rates the address from the data on Port 0.
RESET: A high on this pin for two machine cycles while the oscillator is running
resets the device.
CRYSTAL1: This is the crystal oscillator input. This pin may be driven by an ex-
ternal clock.
CRYSTAL2: This is the crystal oscillator output. It is the inversion of XTAL1.
GROUND: Ground potential
POWER SUPPLY: Supply voltage for operation.
PORT 0: Port 0 is an open-drain bi-directional I/O port. This port also provides a
multiplexed low order address/data bus during accesses to external memory.
PORT 1: Port 1 is a bi-directional I/O port with internal pull-ups. The bits have
alternate functions which are described below:
T2 (P1.0): Timer/Counter 2 external count input
T2EX (P1.1): Timer/Counter 2 Reload/Capture control
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.
W78E054D/W78E052D/W78E051D Data Sheet
- 9 -
Publication Release Date: Dec 29, 2009
Revision A09