W78C438C Data Sheet
8-BIT MICROCONTROLLER
Table of Contents-
1.
2.
3.
4.
5.
GENERAL DESCRIPTION ......................................................................................................... 2
FEATURES................................................................................................................................. 2
PIN CONFIGURATIONS ............................................................................................................ 3
PIN DESCRIPTION..................................................................................................................... 4
FUNCTIONAL DESCRIPTION ................................................................................................... 6
5.1
5.2
5.3
5.4
5.5
5.6
Dedicated Data and Address Port.................................................................................. 6
Additional I/O Port........................................................................................................... 8
Additional External Interrupt ........................................................................................... 8
Newly Added Special Function Registers .................................................................... 10
Power Reduction Function ........................................................................................... 10
Programming Difference............................................................................................... 11
6.
ELECRICAL CHARACTERISTICS........................................................................................... 12
6.1
6.2
6.3
Absolute Maximum Ratings.......................................................................................... 12
D.C. Characteristics...................................................................................................... 12
A.C. Characteristics...................................................................................................... 13
6.3.1 Clock Input Waveform ....................................................................................................13
6.3.2 Program Fetch Cycle......................................................................................................13
6.3.3 Data Memory Read/Write Cycle .....................................................................................14
7.
TIMING WAVEFORMS............................................................................................................. 15
7.1
7.2
Program Fetch Cycle.................................................................................................... 15
Data Memory Read/Write Cycle................................................................................... 16
8.
TYPICAL APPLICATION CIRCUITS ........................................................................................ 17
8.1 Using 128K × 8 bit External EPROM (W27E010) ........................................................ 17
PACKAGE DIMENSIONS......................................................................................................... 19
9.1 100-pin QFP.................................................................................................................. 19
9.
10.
REVISION HISTORY................................................................................................................ 20
Publication Release Date: March 10, 2010
- 1 -
Revision A7
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