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W78E51C Schematic ( PDF Datasheet ) - Winbond

Teilenummer W78E51C
Beschreibung 8-BIT MICROCONTROLLER
Hersteller Winbond
Logo Winbond Logo 




Gesamt 23 Seiten
W78E51C Datasheet, Funktion
www.DataSheet4U.com
W78E51C/W78E051C Data Sheet
8-BIT MICROCONTROLLER
Table of Contents-
1. GENERAL DESCRIPTION ......................................................................................................... 2
2. FEATURES ................................................................................................................................. 2
3. PIN CONFIGURATIONS ............................................................................................................ 3
4. PIN DESCRIPTION..................................................................................................................... 4
5. FUNCTIONAL DESCRIPTION ................................................................................................... 5
5.1 New Defined Peripheral.................................................................................................. 5
5.2 Reduce EMI Emission .................................................................................................... 6
5.3 Watchdog Timer ............................................................................................................. 7
5.4 Clock ............................................................................................................................... 8
5.5 Power Management........................................................................................................ 9
5.6 Reset............................................................................................................................... 9
6. SECURITY BITS ....................................................................................................................... 10
6.1 Lock Bit ......................................................................................................................... 10
6.2 MOVC Inhibit................................................................................................................. 11
6.3 Encryption ..................................................................................................................... 11
7. ELECREICAL CHARACTERISTICS......................................................................................... 12
7.1 Absolute Maximum Ratings .......................................................................................... 12
7.2 D.C. Characteristics...................................................................................................... 12
7.3 A.C. Characteristics ...................................................................................................... 14
7.3.1 Clock Input Waveform ....................................................................................................14
7.3.2 Program Fetch Cycle......................................................................................................14
7.3.3 Data Read Cycle ............................................................................................................15
7.3.4 Data Write Cycle.............................................................................................................15
7.3.5 Port Access Cycle ..........................................................................................................15
7.3.6 Program Operation .........................................................................................................16
8. TIMING WAVEFORMS ............................................................................................................. 17
8.1 Program Fetch Cycle .................................................................................................... 17
8.2 Data Read Cycle........................................................................................................... 17
8.3 Data Write Cycle ........................................................................................................... 18
8.4 Port Access Cycle......................................................................................................... 18
9. TYPICAL APPLICATION CIRCUITS ........................................................................................ 19
9.1 Expanded External Program Memory and Crystal ....................................................... 19
9.2 Expanded External Data Memory and Oscillator ......................................................... 20
10. PACKAGE DIMENSIONS ......................................................................................................... 21
10.1 40-pin DIP ..................................................................................................................... 21
10.2 44-pin PLCC ................................................................................................................. 21
10.3 44-pin PQFP ................................................................................................................. 22
11. REVISION HISTORY ................................................................................................................ 23
Publication Release Date: November 10, 2006
- 1 - Revision A4






W78E51C Datasheet, Funktion
www.DataSheet4U.com
W78E51C/W78E051C
Port 4
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, except the P4.3 and P4.2 are
alternative function pins. It can be used as general I/O pins or external interrupt input sources ( INT2 ,
INT3 ).
Example:
P4
MOV
MOV
ORL
ANL
REG 0D8H
P4, #0AH
; Output data "A" through P4.0P4.3.
A, P4
; Read P4 status to Accumulator.
P4,#00000001B ; Set bit P4.0
P4,#11111101B ; Clear bit P4.1
5.2 Reduce EMI Emission
Because of on-chip Flash EPROM, when a program is running in internal ROM space, the ALE will be
unused. The transition of ALE will cause noise, so it can be turned off to reduce the EMI emission if it
is useless. Turning off the ALE signal transition only requires setting the bit 0 of the AUXR SFR, which
is located at 08Eh. When ALE is turned off, it will be reactivated when the program accesses external
ROM/RAM data or jumps to execute an external ROM code. The ALE signal will turn off again after it
has been completely accessed or the program returns to internal ROM code space. The AO bit in the
AUXR register, when set, disables the ALE output. In order to reduce EMI emission from oscillation
circuitry, W78E051C allows user to diminish the gain of on-chip oscillator amplifiers by using
programmer to clear the B7 bit of security register. Once B7 is set to 0, a half of gain will be
decreased. Care must be taken if user attempts to diminish the gain of oscillator amplifier, reducing a
half of gain may effect to external crystal operating improperly at high frequency above 24 MHz. The
value of R and C1, C2 may need adjustment while running at lower gain.
***AUXR - Auxiliary register (8EH)
- - - - - - - AO
AO: Turn off ALE output.
Power-off Flag
***PCON - Power control (87H)
-
-
-
POF
GF1
GF0
PD
IDL
POF:
Power off flag. Bit is set by hardware when power on reset. It can be cleared by software
to determine chip reset is a warm boot or cold boot.
GF1, GF0: These two bits are general-purpose flag bits for the user.
PD: Power down mode bit. Set it to enter power down mode.
IDL: Idle mode bit. Set it to enter idle mode.
The power-off flag is located at PCON.4. This bit is set when VDD has been applied to the part. It can
be used to determine if a reset is a warm boot or a cold boot if it is subsequently reset by software.
-6-

6 Page









W78E51C pdf, datenblatt
www.DataSheet4U.com
W78E51C/W78E051C
7. ELECREICAL CHARACTERISTICS
7.1 Absolute Maximum Ratings
PARAMETER
DC Power Supply
Input Voltage
Operating Temperature
Storage Temperature
SYMBOL
VDDVSS
VIN
TA
TST
MIN.
-0.3
VSS -0.3
0
-55
MAX.
+7.0
VDD +0.3
70
+150
UNIT
V
V
°C
°C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
7.2 D.C. Characteristics
VCCVSS = 5V ±10%, TA = 25° C, unless otherwise specified.
PARAMETER
SYMBOL TEST CONDITIONS
Operating Voltage
Operating Current
Idle Current
Power Down Current
Input Current
P1, P2, P3, P4
Logical 1-to-0 Transition
Current P1, P2, P3(*1), P4
Input Current
RST (*2)
Input Leakage Current
P0, EA
Output Low Voltage
P1, P2, P3, P4
Output Low Voltage
ALE, PSEN , P0 (*3)
Output High Voltage
P1, P2, P3, P4
VDD
IDD
IIDLE
IPWDN
IIN1
ITL
IIN2
ILK
VOL1
VOL2
VOH1
No load VDD = 5.5V
Idle mode VDD = 5.5V
Power-down mode
VDD = 5.5V
VDD = 5.5V
VIN = 0V or VDD
VDD = 5.5V
VIN = 2.0V (*1)
VDD = 5.5V
VIN = VDD
VDD = 5.5V
0V < VIN < VDD
VDD = 4.5V
IOL1 = +2 mA
VDD = 4.5V
IOL2 = +4 mA
VDD = 4.5V
IOH1 = -100 μA
SPECIFICATION
MIN. MAX.
4.5 5.5
- 20
-6
- 50
UNIT
V
mA
mA
μA
-50 +10 μA
-550 - μA
-10 +300 μA
-10 +10 μA
- 0.45 V
- 0.45 V
2.4 - V
- 12 -

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