W78C438C Data Sheet
8-BIT MICROCONTROLLER
Table of Contents-
1.
2.
3.
4.
5.
GENERAL DESCRIPTION ......................................................................................................... 2
FEATURES................................................................................................................................. 2
PIN CONFIGURATIONS ............................................................................................................ 3
PIN DESCRIPTION..................................................................................................................... 5
FUNCTIONAL DESCRIPTION ................................................................................................... 7
5.1
5.2
5.3
5.4
5.5
5.6
Dedicated Data and Address Port.................................................................................. 7
Additional I/O Port........................................................................................................... 9
Additional External Interrupt ........................................................................................... 9
Newly Added Special Function Registers .................................................................... 11
Power Reduction Function ........................................................................................... 11
Programming Difference............................................................................................... 12
6.
7.
ELECRICAL CHARACTERISTICS........................................................................................... 13
6.1
6.2
6.3
Absolute Maximum Ratings.......................................................................................... 13
D.C. Characteristics...................................................................................................... 13
A.C. Characteristics...................................................................................................... 14
6.3.1 Clock Input Waveform ....................................................................................................14
6.3.2 Program Fetch Cycle......................................................................................................14
6.3.3 Data Memory Read/Write Cycle .....................................................................................15
TIMING WAVEFORMS............................................................................................................. 16
7.1
7.2
Program Fetch Cycle.................................................................................................... 16
Data Memory Read/Write Cycle................................................................................... 17
8.
9.
TYPICAL APPLICATION CIRCUITS ........................................................................................ 18
8.1 Using 128K × 8 bit External EPROM (W27E010) ........................................................ 18
PACKAGE DIMENSIONS......................................................................................................... 20
9.1
9.2
84-pin PLCC ................................................................................................................. 20
100-pin QFP.................................................................................................................. 21
10.
REVISION HISTORY................................................................................................................ 22
Publication Release Date: December 4, 2006
- 1 -
Revision A6
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