SECTION 1
INTRODUCTION
The
M6805
Family
of
low-cost single-chip microcomputers was designed for the user who needs
an
economical microcomputer with the proven capabilities
of
the M6800-based instruction set. This
rapidly expanding family includes a number of memory and package
sizes
with various 1/0 func-
tions in both
HMOS
and
CMOS.
This document describes the eight 8-bit high-density N-channel silicon-gate microcomputers which
comprise the
MC68(7)05R/U series. These devices
are
listed below:
MC6805R2 MC6805R3
MC68705R3
MC68705R5
MC6805U2 MC6805U3 MC68705U3 MC68705U5
These eight devices
are
8-bit high-density N-channel silicon-gate microcomputers. They
are
avail-
able
in
40-pin dual-in-line packages.
1.1
DEVICE FEATURES
The following tables summarize the hardware
and
software features of
each
device. Differences
between the devices
will
be
highlighted throughout this document when applicable.
HARDWARE FEATURES
MC6805R2 MC6805R3 MC6805U2 MC6805U3 MC68705R3 MC68705U3
MC68705R5 MC68705U5
24 Bidirectional
I/O
Lines
X
X
X X
X X
X X
Eight Input-Only Lines X X X
X
X
X X
X
A/
D Converter X X
-
-
X
-
X
-
User ROM (Bytes) 2048
3776
2048
3776
- -
-
-
User
EPROM
(Bytes)
-
-
- -
3776 3776
3776 3776
RAM (Bytes)
64
112
64
112
112 112
112
112
Self-Check Mode
X
X
X X
-
-
- -
Zero/ Crossing
Detect! Interrupt X X X
X
X X
X
X
Timer
with
7-Bit
Prescaler
X
X X
X
X
X X
X
Programmable
Prescaler
-
-
X X
X X
X X
5-Volt Single Supply
X
X X
X
X
X
X X
Memory Mapped
I/O
X
X
X X X X
X X
On-Chip EPROM
Programmer
- - -
-
X
X X
X
EPROM Security
Feature
-
-
- -
-
- X X
1-1
To Next Page
Loading...
Need help?
General
