DataSheet.es    


PDF W78L51P-24 Data sheet ( Hoja de datos )

Número de pieza W78L51P-24
Descripción 8-BIT MICROCONTROLLER
Fabricantes Winbond 
Logotipo Winbond Logotipo



Hay una vista previa y un enlace de descarga de W78L51P-24 (archivo pdf) en la parte inferior de esta página.


Total 18 Páginas

No Preview Available ! W78L51P-24 Hoja de datos, Descripción, Manual

W78L51
8-BIT MICROCONTROLLER
GENERAL DESCRIPTION
The W78L51 microcontroller supplies a wider frequency and supply voltage range than most 8-bit
microcontrollers on the market. It is compatible with the industry standard 80C51 microcontroller
series.
The W78L51 contains four 8-bit bidirectional parallel ports, one extra 4-bit bit-addressable I/O port
(Port 4) and two additional external interrupts (INT2 , INT3 ), two 16-bit timer/counters, one watchdog
timer and a serial port. These peripherals are supported by a seven-source, two-level interrupt
capability. There are 128 bytes of RAM and an 4K byte mask ROM for application programs.
The W78L51 microcontroller has two power reduction modes, idle mode and power-down mode, both
of which are software selectable. The idle mode turns off the processor clock but allows for continued
peripheral operation. The power-down mode stops the crystal oscillator for minimum power
consumption. The external clock can be stopped at any time and in any state without affecting the
processor.
FEATURES
Fully static design
Supply voltage of 1.8V to 5.5V
DC-24 MHz operation
128 bytes of on-chip scratchpad RAM
4K bytes of on-chip mask ROM
64K bytes program memory address space
64K bytes data memory address space
Four 8-bit bidirectional ports
Two 16-bit timer/counters
One full duplex serial port
Seven-source, two-level interrupt capability
One extra 4-bit bit-addressable I/O port
Two additional external interrupts INT2 / INT3
Watchdog timer
EMI reduction mode
Built-in power management
Code protection
Packages:
DIP 40: W78L51-24
PLCC 44: W78L51P-24
QFP 44: W78L51F-24
Publication Release Date: January 1999
- 1 - Revision A2

1 page




W78L51P-24 pdf
W78L51
FUNCTIONAL DESCRIPTION
The W78L51 architecture consists of a core controller surrounded by various registers, five general
purpose I/O ports, 128 bytes of RAM, two timer/counters, one watchdog timer and a serial port. The
processor supports 111 different opcodes and references both a 64K program address space and a
64 K data storage space.
Timers 0, 1
Timers 0, 1 each consist of two 8-bit data registers. These are called TL0 and TH0 for Timer 0, TL1
and TH1 for Timer 1. The TCON and TMOD registers provide control functions for timers 0, 1.
Clock
The W78L51 is designed to be used with either a crystal oscillator or an external clock. Internally, the
clock is divided by two before it is used. This makes the W78L51 relatively insensitive to duty cycle
variations in the clock.
Crystal Oscillator
The W78L51 incorporates a built-in crystal oscillator. To make the oscillator work, a crystal must be
connected across pins XTAL1 and XTAL2. In addition, a load capacitor must be connected from each
pin to ground, and a resistor must also be connected from XTAL1 to XTAL2 to provide a DC bias
when the crystal frequency is above 24 MHz.
External Clock
An external clock should be connected to pin XTAL1. Pin XTAL2 should be left unconnected. The
XTAL1 input is a CMOS-type input, as required by the crystal oscillator. As a result, the external clock
signal should have an input high level of greater than 3.5 volts when VDD = 5 volts.
Power Management
Idle Mode
The idle mode is entered by setting the IDL bit in the PCON register. In the idle mode, the internal
clock to the processor is stopped. The peripherals and the interrupt logic continue to be clocked. The
processor will exit idle mode when either an interrupt or a reset occurs.
Power-down Mode
When the PD bit of the PCON register is set, the processor enters the power-down mode. In this
mode all of the clocks, including the oscillator are stopped. The only way to exit power-down mode is
by a reset.
Reset
The external RESET signal is sampled at S5P2. To take effect, it must be held high for at least two
machine cycles while the oscillator is running.
An internal trigger circuit in the reset line is used to deglitch the reset line when the W78L51 is used
with an external RC network. The reset logic also has a special glitch removal circuit that ignores
glitches on the reset line.
During reset, the ports are initialized to FFH, the stack pointer to 07H, PCON (with the exception of
bit 4) to 00H, and all of the other SFR registers except SBUF to 00H. SBUF is not reset.
Publication Release Date: January 1999
- 5 - Revision A2

5 Page





W78L51P-24 arduino
W78L51
AC CHARACTERISTICS
The AC specifications are a function of the particular process used to manufacture the part, the
ratings of the I/O buffers, the capacitive load, and the internal routing capacitance. Most of the
specifications can be expressed in terms of multiple input clock periods (TCP), and actual parts will
usually experience less than a ±20 nS variation. The numbers below represent the performance
expected from a 0.5 micron CMOS process when using 2 and 4 mA output buffers.
Clock Input Waveform
XTAL1
TCH
TCL
F OP, TCP
PARAMETER
SYMBOL
MIN.
Operating Speed
FOP
0
Clock Period
TCP 25
Clock High
TCH 10
Clock Low
TCL 10
Notes:
1. The clock may be stopped indefinitely in either state.
2. The TCP specification is used as a reference in other specifications.
3. There are no duty cycle requirements on the XTAL1 input.
TYP.
-
-
-
-
MAX.
24
-
-
-
UNIT
MHz
nS
nS
nS
NOTES
1
2
3
3
Program Fetch Cycle
PARAMETER
SYMBOL MIN.
Address Valid to ALE Low
Address Hold from ALE Low
ALE Low to PSEN Low
PSEN Low to Data Valid
TAAS
TAAH
TAPL
TPDA
1 TCP-
1 TCP-
1 TCP-
-
Data Hold after PSEN High
TPDH
0
Data Float after PSEN High
TPDZ
0
ALE Pulse Width
PSEN Pulse Width
TALW
TPSW
2 TCP-
3 TCP-
Notes:
1. P0.0P0.7, P2.0P2.7 remain stable throughout entire memory cycle.
2. Memory access time is 3 TCP.
3. Data have been latched internally prior to PSEN going high.
4. "" (due to buffer driving delay and wire loading) is 20 nS.
TYP.
-
-
-
-
-
-
2 TCP
3 TCP
MAX.
-
-
-
2 TCP
1 TCP
1 TCP
-
-
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
NOTES
4
1, 4
4
2
3
4
4
- 11 -
Publication Release Date: January 1999
Revision A2

11 Page







PáginasTotal 18 Páginas
PDF Descargar[ Datasheet W78L51P-24.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
W78L51P-248-BIT MICROCONTROLLERWinbond
Winbond

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar