W78E516B40DL Nuvoton Technology Corporation of America, W78E516B40DL Datasheet - Page 5

• Manufacturer Part Number: W78E516B40DL
• Description: IC MCU 8-BIT 64K FLASH 40-DIP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W78r

Specifications of W78E516B40DL

• Core Processor: 8052
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: EBI/EMI, UART/USART
• Peripherals: POR
• Number Of I /o: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

4. PIN DESCRIPTION
* Note: TYPE I: input, O: output, I/O: bi-directional, H: pull-high, L: pull-low, D: open drain
PORT4
Another bit-addressable port P4 is also available and only 4 bits (P4<3:0>) can be used. This port
address is located at 0D8H with the same function as that of port P1.
Example:
P0.0 − P0.7
P1.0 − P1.7
P2.0 − P2.7
P3.0 − P3.7
P4.0 − P4.3
SYMBOL
XTAL1
XTAL2
PSEN
RST
ALE
V
V
EA
DD
SS
P4
MOV
MOV
ORL
ANL
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 PORT 4: A bi-directional I/O. See details below.
TYPE
O H
O H
I L
O
I
I
I
I
REG
P4, #0AH
A, P4
P4, #00000001B
P4, #11111110B
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:
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.
CRYSTAL 2: This is the crystal oscillator output. It is the inversion of XTAL1.
GROUND: ground potential.
POWER SUPPLY: Supply voltage for operation.
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.
0D8H
; Output data "A" through P4.0 − P4.3.
; Read P4 status to Accumulator.
- 5 -
DESCRIPTIONS
PSEN
enables the external ROM data in the
Publication Release Date: December 4, 2006
W78E516B
Revision A11
PSEN