
Preliminary W79E648 Data Sheet
8-BIT MICROCONTROLLER
Publication Release Date: 05/31/2004
Revision A1
- 1 -
Table of Contents-
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GENERAL DESCRIPTION.................................................................................................................... 2
FEATURES............................................................................................................................................ 2
PIN CONFIGURATION.......................................................................................................................... 3
PIN DESCRIPTION ............................................................................................................................... 4
BLOCK DIAGRAM................................................................................................................................. 6
FUNCTIONAL DESCRIPTION .............................................................................................................. 7
MEMORY ORGANIZATION .................................................................................................................. 8
INSTRUCTION .................................................................................................................................... 28
8.1
Instruction Timing .......................................................................................................... 28
POWER MANAGEMENT..................................................................................................................... 34
INTERRUPTS...................................................................................................................................... 37
PROGRAMMABLE TIMERS/COUNTERS .......................................................................................... 39
11.1
Timer/Counters 0 & 1..................................................................................................... 39
11.2
Timer/Counter 2............................................................................................................. 42
11.3
Watchdog Timer ............................................................................................................ 45
SERIAL PORT..................................................................................................................................... 52
12.1
Framing Error Detection ................................................................................................ 58
12.2
Multiprocessor Communications ................................................................................... 58
TIMED ACCESS PROTECTION ......................................................................................................... 59
H/W REBOOT MODE (BOOT FROM 4K BYTES OF LDFLASH) ....................................................... 61
IN-SYSTEM PROGRAMMING ............................................................................................................ 62
15.1
The Loader Program Locates at LDFlash Memory....................................................... 62
15.2
The Loader Program Locates at APFlash Memory....................................................... 62
H/W WRITER MODE........................................................................................................................... 62
SECURITY BITS.................................................................................................................................. 63
ELECTRICAL CHARACTERISTICS.................................................................................................... 65
18.1
Absolute Maximum Ratings........................................................................................... 65
18.2
DC Characteristics......................................................................................................... 66
18.3
AC Characteristics......................................................................................................... 67
TYPICAL APPLICATION CIRCUITS...................................................................................................72
PACKAGE DIMENSIONS.................................................................................................................... 73
APPLICATION NOTE.......................................................................................................................... 75
REVISION HISTORY........................................................................................................................... 80
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