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PDF ( 数据手册 , 数据表 ) W78E51C

零件编号 W78E51C
描述 8-BIT MICROCONTROLLER
制造商 Winbond
LOGO Winbond LOGO 


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W78E51C 数据手册, 描述, 功能
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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 pdf, 数据表
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W78E51C/W78E051C
WIDL
IDLE
OSC
1/12
ENW
EXTERNAL
RESET
PRESCALER
14-BIT TIMER
CLEAR
INTERNAL
RESET
Watchdog Timer Block Diagram
CLRW
Typical Watch-dog time-out period when OSC = 20 MHz
PS2 PS1 PS0
00 0
00 1
01 0
01 1
10 0
10 1
11 0
11 1
WATCHDOG TIME-OUT PERIOD
19.66 mS
39.32 mS
78.64 mS
157.28 mS
314.57 mS
629.14 mS
1.25 S
2.50 S
5.4 Clock
The W78E051C 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 W78E051C relatively insensitive to duty
cycle variations in the clock. The W78E051C 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. An external clock source 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.
-8-







W78E51C equivalent, schematic
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W78E51C/W78E051C
7.3.6 Program Operation
PARAMETER
VPP Setup Time
Data Setup Time
Data Hold Time
Address Setup Time
Address Hold Time
SYMBOL
TVPS
TDS
TDH
TAS
TAH
MIN.
2.0
2.0
2.0
2.0
0
TYP.
-
-
-
-
-
MAX.
-
-
-
-
-
UNIT
μS
μS
μS
μS
μS
CE Program Pulse Width for Program
Operation
OECTRL Setup Time
OECTRL Hold Time
TPWP
TOCS
TOCH
290 300 310 μS
2.0 - - μS
2.0 - - μS
OE Setup Time
TOES
2.0
-
- μS
OE High to Output Float
TDFP 0 - 130 nS
Data Valid from OE
TOEV - - 150 nS
Note: Flash data can be accessed only in flash mode. The RST pin must pull in VIH status, the ALE pin must pull in VIL status,
and the PSEN pin must pull in VIH status.
- 16 -










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