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W78LE51 Schematic ( PDF Datasheet ) - Winbond

Teilenummer W78LE51
Beschreibung 8-BIT MICROCONTROLLER
Hersteller Winbond
Logo Winbond Logo 




Gesamt 25 Seiten
W78LE51 Datasheet, Funktion
W78LE51/W78L051A
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
6. ON-CHIP FLASH EPROM CHARACTERISTICS..................................................................... 10
7. SECURITY BITS ....................................................................................................................... 12
8. ABSOLUTE MAXIMUM RATINGS ........................................................................................... 13
9. DC CHARACTERISTICS.......................................................................................................... 14
10. AC CHARACTERISTICS .......................................................................................................... 16
11. TIMING WAVEFORMS ............................................................................................................. 18
12. TYPICAL APPLICATION CIRCUITS ........................................................................................ 21
13. PACKAGE DIMENSIONS ......................................................................................................... 23
14. REVISION HISTORY ................................................................................................................ 25
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Publication Release Date: November 6, 2006
- 1 - Revision A6






W78LE51 Datasheet, Funktion
W78LE51/W78L051A
2. 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, 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
P4.#11111110B
3. 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, W78L051 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 some adjustment while running at lower gain.
***AUXR - Auxiliary register (8EH)
- - - - - - - AO
AO: Turn off ALE output.
4. 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.
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6 Page









W78LE51 pdf, datenblatt
W78LE51/W78L051A
7. SECURITY BITS
During the on-chip Flash EPROM operation mode, the Flash EPROM can be programmed and
verified repeatedly. Until the code inside the Flash EPROM is confirmed OK, the code can be
protected. The protection of Flash EPROM and those operations on it are described below. The
W78L051 has a Special Setting Register, the Security Register, which can not be accessed in normal
mode. The Security register can only be accessed from the Flash EPROM operation mode. Those bits
of the Security Registers can not be changed once they have been programmed from high to low.
They can only be reset through erase-all operation. The Security Register is addressed in the Flash
EPROM operation mode by address #0FFFFh.
D7 D6 D5 D4 D3 D2 D1 D0
B7 Reserved B2 B1 B0
Security Bits
B0 : Lock bit, logic 0 : active
B1 : MOVC inhibit,
logic 0 : the MOVC instruction in external memory
cannot access the code in internal memory.
logic 1 : no restriction.
B2 : Encryption
logic 0 : the encryption logic enable
logic 1 : the encryption logic disable
B7 : Osillator Control
logic 0 : 1/2 gain
logic 1 : Full gain
Default 1 for all security bits.
Reserved bits must be kept in logic 1.
4KB Flash EPROM 0000h
Program Memory
Reserved
0FFFh
Security Register 0FFFFh
Special Setting Register
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- 12 -

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