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PDF W78E52C Data sheet ( Hoja de datos )
| Número de pieza | W78E52C | |
| Descripción | 8-BIT MICROCONTROLLER | |
| Fabricantes | Winbond | |
| Logotipo |  |
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W78E52C Data Sheet
Table of Contents-
8-BIT MICROCONTROLLER
1. GENERAL DESCRIPTION .........................................................................................................2
2. FEATURES ................................................................................................................................ 2
3. PIN CONFIGURATIONS ............................................................................................................3
4. PIN DESCRIPTION.................................................................................................................... 4
5. BLOCK DIAGRAM ..................................................................................................................... 5
6. FUNCTIONAL DESCRIPTION ...................................................................................................6
6.1 Timers 0, 1, and 2...........................................................................................................6
6.2 New Defined Peripheral..................................................................................................6
6.3 Watchdog Timer .............................................................................................................8
6.4 Clock ............................................................................................................................ 10
6.5 Power Management......................................................................................................10
6.6 Reset............................................................................................................................ 10
7. SECURITY BITS ...................................................................................................................... 11
7.1 Lock Bit ........................................................................................................................ 11
7.2 MOVC Inhibit.................................................................................................................11
7.3 Encryption .....................................................................................................................11
8. ELECTRICAL CHARACTERISTICS.........................................................................................12
8.1 Absolute Maximum Ratings ..........................................................................................12
8.2 D.C. Characteristics......................................................................................................12
8.3 A.C. Characteristics ......................................................................................................14
9. TIMING WAVEFORMS .............................................................................................................16
9.1 Program Fetch Cycle ....................................................................................................16
9.2 Data Read Cycle...........................................................................................................17
9.3 Data Write Cycle...........................................................................................................17
9.4 Port Access Cycle.........................................................................................................18
10. TYPICAL APPLICATION CIRCUITS ........................................................................................19
10.1 Expanded External Program Memory and Crystal .......................................................19
10.2 Expanded External Data Memory and Oscillator .........................................................20
11. PACKAGE DIMENSIONS .........................................................................................................21
11.1 40-pin DIP .....................................................................................................................21
11.2 44-pin PLCC .................................................................................................................21
11.3 44-pin PQFP .................................................................................................................22
12. REVISION HISTORY ...............................................................................................................2 3
Publication Release Date: May 16, 2005
- 1 - Revision A3
http://www.Datasheet4U.com
1 page  
5. BLOCK DIAGRAM
W78E52C
P1.0
~
P1.7
Port
1
INT2
INT3
P3.0
~
P3.7
Port
3
P4.0
~
P4.3
Port
4
Port 1
Latch
Interrupt
Timer
2
Timer
0
Timer
1
UART
ACC
T1
B
T2
PSW
Stack
ALU Pointer
Port 0
Latch
DPTR
Temp Reg.
PC
Incrementor
Addr. Reg.
Port 3
Latch
Instruction
Decoder
&
Sequencer
SFR RAM
Address
256 bytes
RAM & SFR
Port 4
Latch
Bus & Clock
Controller
ROM
Watchdog
Timer
Oscillator
Reset Block
Power control
Port 2
Latch
XTAL1 XTAL2 ALE PSEN RST Vcc Vss
Port
0
P0.0
~
P0.7
Port
2
P2.0
~
P2.7
Publication Release Date: May 16, 2005
- 5 - Revision A3
5 Page 
W78E52C
7. SECURITY BITS
During the on-chip Flash EPROM operation mode, the ROM
can be programmed and verified
repeatedly. Until the code inside the ROM is confir med OK, the code can be protected. The protection
of ROM and those operations on it are described below.
The W78E52C 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
address #0FFFFh.
8KB On-chip ROM
Program Memory
0000h
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.
Reserved
Security Register
Special Setting Register
1FFFh
0FFFFh
7.1 Lock Bit
This bit is used to protect the customer's program code in the W78E52C. It may be set after the
programmer finishes the programming and verifies sequenc e. Once this bit is set to logic 0, both the
ROM data and Special Setting Register can not be accessed again.
7.2 MOVC Inhibit
This bit is used to restrict the accessible region of the MOVC instruction. It can prevent the MOVC
instruction in external program memory from reading the internal program code. When this bit is set to
logic 0, a MOVC instruction in external program memory space will be able to access code only in the
external memory, not in the internal memory. A MO VC instruction in internal program memory space
will always be able to access the ROM data in both inte rnal and external memory. If this bit is logic 1,
there are no restrictions on the MOVC instruction.
7.3 Encry ption
This bit is used to enable/disable the encryption logic for code protection. Once encryption feature is
enabled, the data presented on port 0 will be encoded via encryption logic. Only whole chip erase will
reset this bit.
- 11 -
Publication Release Date: May 16, 2005
Revision A3
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet W78E52C.PDF ] | |
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