Datenblatt-pdf.com


W78C052D Schematic ( PDF Datasheet ) - Winbond

Teilenummer W78C052D
Beschreibung 8-BIT MICROCONTROLLER
Hersteller Winbond
Logo Winbond Logo 




Gesamt 21 Seiten
W78C052D Datasheet, Funktion
W78C52D/W78C052D
www.DataSheet4U.com
8-BIT MICROCONTROLLER
Table of Contents-
1. GENERAL DESCRIPTION ......................................................................................................... 2
2. FEATURES ................................................................................................................................. 2
3. PIN CONFIGURATIONS ............................................................................................................ 3
4. PIN DESCRIPTION..................................................................................................................... 4
5. FUNCTIONAL DESCRIPTION ................................................................................................... 6
6. ABSOLUTE MAXIMUM RATINGS ........................................................................................... 10
7. DC CHARACTERISTICS.......................................................................................................... 11
8. AC CHARACTERISTICS .......................................................................................................... 13
9. TIMING WAVEFORMS ............................................................................................................. 15
10. APPLICATION CIRCUITS ........................................................................................................ 17
11. PACKAGE DIMENSIONS ......................................................................................................... 19
12. REVISION HISTORY ................................................................................................................ 21
Publication Release Date: December 4, 2006
- 1 - Revision A5






W78C052D Datasheet, Funktion
W78C52D/W78C052D
5. FUNCTIONAL DESCRIPTION
The W78C052D architecture consists of a core controller surrounded by various registers, five general
purpose I/O ports, 256 bytes of RAM, three 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, and 2
Timers 0, 1, and 2 each consist of two 8-bit data registers. These are called TL0 and TH0 for Timer 0,
TL1 and TH1 for Timer 1, and TL2 and TH2 for Timer 2. The TCON and TMOD registers provide
control functions for timers 0, 1. The T2CON register provides control functions for Timer 2. RCAP2H
and RCAP2L are used as reload/capture registers for Timer 2. The operations of Timer 0 and Timer 1
are the same as in the W78C51. Timer 2 is a special feature of the W78C052D: it is a 16-bit
timer/counter that is configured and controlled by the T2CON register. Like Timers 0 and 1, Timer 2
can operate as either an external event counter or as an internal timer, depending on the setting of bit
C/T2 in T2CON. Timer 2 has three operating modes: capture, auto-reload, and baud rate generator.
The clock speed at capture or auto-reload mode is the same as that of Timers 0 and 1.
Clock
The W78C052D 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 W78C052D relatively insensitive to duty
cycle variations in the clock.
Crystal Oscillator
The W78C052D 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 one 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 W78C052D 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.
-6-

6 Page









W78C052D pdf, datenblatt
W78C52D/W78C052D
DC Characteristics, continued
PARAMETER
SYM.
SPECIFICATION
MIN. MAX. UNIT
TEST CONDITIONS
Output
Output Low Voltage
P1, P2, P3, P4
Output Low Voltage
P0, ALE, PSEN [*4]
VOL1 - 0.45 V
VOL2 - 0.45 V
VDD = 4.5V
IOL = +2 mA
VDD = 4.5V
IOL = +4 mA
Sink Current
P1, P2, P3, P4
Sink Current
P0, ALE, PSEN
ISK1
4
8 mA
ISK2 8 16 mA
VDD = 4.5V
Vin = 0.45V
VDD = 4.5V
VIN = 0.45V
Output High Voltage
P1, P2, P3, P4
Output High Voltage
P0, ALE, PSEN [*4]
Source Current
P1, P2, P3, P4
Source Current
P0, ALE, PSEN
VOH1
2.4
-
V
VOH2
ISR1
2.4
-100
-
-250
V
µA
ISR2 -8 -14 mA
VDD = 4.5V
IOH = -100 µA
VDD = 4.5V
IOH = -400 µA
VDD = 4.5V
VIN = 2.4V
VDD = 4.5V
VIN = 2.4V
Notes:
*1. RST pin has an internal pull-down.
*2. Pins of P1 and P3 can source a transition current when they are being externally driven from 1 to 0.
*3. RST is a Schmitt trigger input and XTAL1 is a CMOS input.
*4. P0, P2, ALE and PSEN are tested in the external access mode.
- 12 -

12 Page





SeitenGesamt 21 Seiten
PDF Download[ W78C052D Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
W78C052D8-BIT MICROCONTROLLERWinbond
Winbond

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche