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PDF W78E054C Data sheet ( Hoja de datos )
| Número de pieza | W78E054C | |
| Descripción | 8-BIT MICROCONTROLLER | |
| Fabricantes | Winbond | |
| Logotipo |  |
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W78E54C/W78E054C Data Sheet
8-BIT MICROCONTROLLER
Table of Contents-
1.
2.
www.DataSheet4U.com3.
4.
5.
6.
7.
8.
GENERAL DESCRIPTION ......................................................................................................... 3
FEATURES ................................................................................................................................. 3
PIN CONFIGURATIONS ............................................................................................................ 4
PIN DESCRIPTION..................................................................................................................... 5
FUNCTIONAL DESCRIPTION ................................................................................................... 6
5.1 Timers 0, 1, and 2 ........................................................................................................... 6
5.2 New Defined Peripheral.................................................................................................. 6
5.2.1 INT2 / INT3 ....................................................................................................................6
5.2.2 PORT4 .............................................................................................................................7
5.2.3 Reduce EMI Emission ......................................................................................................7
5.3 Power-off Flag ................................................................................................................ 8
5.4 Watchdog Timer ............................................................................................................. 8
5.5 Clock ............................................................................................................................. 10
5.6 Power Management...................................................................................................... 10
5.7 Reset............................................................................................................................. 10
SECURITY BITS ....................................................................................................................... 11
6.1 Lock Bit ......................................................................................................................... 11
6.2 MOVC Inhibit................................................................................................................. 12
6.3 Encryption ..................................................................................................................... 12
ELECTRICAL CHARACTERISTICS......................................................................................... 13
7.1 Absolute Maximum Ratings .......................................................................................... 13
7.2 D.C. Characteristics...................................................................................................... 13
7.3 A.C. Characteristics ...................................................................................................... 15
7.3.1 Clock Input Waveform ....................................................................................................15
7.3.2 Program Fetch Cycle......................................................................................................15
7.3.3 Data Read Cycle ............................................................................................................16
7.3.4 Data Write Cycle.............................................................................................................16
7.3.5 Port Access Cycle ..........................................................................................................16
7.3.6 Program Operation .........................................................................................................17
TIMING WAVEFORMS ............................................................................................................. 18
Publication Release Date: October 3, 2006
- 1 - Revision A4
1 page  
W78E54C/W78E054C
4. PIN DESCRIPTION
SYMBOL
DESCRIPTIONS
EXTERNAL ACCESS ENABLE: This pin forces the processor to execute out of
external ROM. It should be kept high to access internal ROM. The ROM address and
EA data will not be presented on the bus if EA pin is high and the program counter is
within on-chip ROM area.
www.DataSheet4U.com PSEN
PROGRAM STORE ENABLE: PSEN enables the external ROM data onto the Port 0
address/ data bus during fetch and MOVC operations. When internal ROM access is
performed, no PSEN strobe signal outputs from this pin.
ALE
ADDRESS LATCH ENABLE: ALE is used to enable the address latch that separates
the address from the data on Port 0.
RST
RESET: A high on this pin for two machine cycles while the oscillator is running resets
the device.
XTAL1
CRYSTAL1: This is the crystal oscillator input. This pin may be driven by an external
clock.
XTAL2 CRYSTAL2: This is the crystal oscillator output. It is the inversion of XTAL1.
VSS GROUND: Ground potential
VDD POWER SUPPLY: Supply voltage for operation.
PORT 0: Port 0 is a bi-directional I/O port which also provides a multiplexed low order
P0.0−P0.7 address/data bus during accesses to external memory. The Port 0 is also an open-
drain port and external pull-ups need to be connected while in programming.
PORT 1: Port 1 is a bi-directional I/O port with internal pull-ups. The bits have alternate
functions which are described below:
P1.0−P1.7 T2(P1.0): Timer/Counter 2 external count input
T2EX(P1.1): Timer/Counter 2 Reload/Capture control
P2.0−P2.7
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.
PORT 3: Port 3 is a bi-directional I/O port with internal pull-ups. All bits have alternate
functions, which are described below:
RXD(P3.0) : Serial Port receiver input
TXD(P3.1) : Serial Port transmitter output
P3.0−P3.7
INT0 (P3.2) : External Interrupt 0
INT1(P3.3) : External Interrupt 1
T0(P3.4) : Timer 0 External Input
T1(P3.5) : Timer 1 External Input
WR (P3.6) :External Data Memory Write Strobe
RD (P3.7) : External Data Memory Read Strobe
PORT 4: Another bit-addressable bidirectional I/O port P4. P4.3 and P4.2 are alternative
P4.0−P4.3 function pins. It can be used as general I/O port or external interrupt input sources
(INT2 /INT3 ).
Publication Release Date: October 3, 2006
- 5 - Revision A4
5 Page 
W78E54C/W78E054C
6. 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 W78E054C has a Security Register which can not be accessed in normal mode. These registers
can only be accessed from the Flash EPROM operation mode. Those bits of the Security Register 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
www.DataSheet4U.comaddress #0FFFFh.
0000h
16KB On-chip ROM
Program Memory
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.
Special Setting Register
Reserved
Security Register
3FFFh
0FFFFh
6.1 Lock Bit
This bit is used to protect the customer's program code in the W78E054C. It may be set after the
programmer finishes the programming and verifies sequence. Once this bit is set to logic 0, both the
Flash EPROM data and Special Setting Register can not be accessed again.
- 11 -
Publication Release Date: October 3, 2006
Revision A4
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet W78E054C.PDF ] | |
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