W78E51C Data Sheet
8-BIT MICROCONTROLLER
Table of Contents-
1.
2.
3.
4.
5.
6.
GENERAL DESCRIPTION ......................................................................................................... 2
FEATURES................................................................................................................................. 2
PIN CONFIGURATIONS ............................................................................................................ 3
PIN DESCRIPTION..................................................................................................................... 4
BLOCK DIAGRAM ...................................................................................................................... 5
FUNCTIONAL DESCRIPTION ................................................................................................... 6
6.1
6.2
6.3
6.4
6.5
6.6
New Defined Peripheral.................................................................................................. 6
Reduce EMI Emission .................................................................................................... 7
Watchdog Timer ............................................................................................................. 8
Clock............................................................................................................................... 9
Power Management........................................................................................................ 9
Reset............................................................................................................................. 10
7.
8.
SECURITY BITS....................................................................................................................... 10
7.1
7.2
7.3
Lock Bit ......................................................................................................................... 10
MOVC Inhibit................................................................................................................. 11
Encryption..................................................................................................................... 11
ELECREICAL CHARACTERISTICS......................................................................................... 11
8.1
8.2
8.3
Absolute Maximum Ratings.......................................................................................... 11
D.C. Characteristics...................................................................................................... 11
A.C. Characteristics...................................................................................................... 13
8.3.1 Clock Input Waveform ....................................................................................................13
8.3.2 Program Fetch Cycle......................................................................................................13
8.3.3 Data Read Cycle ............................................................................................................14
8.3.4 Data Write Cycle.............................................................................................................14
8.3.5 Port Access Cycle ..........................................................................................................14
8.3.6 Program Operation.........................................................................................................15
9.
TIMING WAVEFORMS............................................................................................................. 16
9.1
9.2
9.3
9.4
Program Fetch Cycle.................................................................................................... 16
Data Read Cycle........................................................................................................... 16
Data Write Cycle........................................................................................................... 17
Port Access Cycle......................................................................................................... 17
10.
11.
TYPICAL APPLICATION CIRCUITS ........................................................................................ 18
10.1 Expanded External Program Memory and Crystal....................................................... 18
10.2 Expanded External Data Memory and Oscillator ......................................................... 19
PACKAGE DIMENSIONS......................................................................................................... 20
11.1 40-pin DIP..................................................................................................................... 20
11.2 44-pin PLCC ................................................................................................................. 20
11.3 44-pin PQFP ................................................................................................................. 21
REVISION HISTORY................................................................................................................ 22
12.
Publication Release Date: May 16, 2005
- 1 -
Revision A3
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