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DS5000T-32-12 Schematic ( PDF Datasheet ) - Dallas Semiconducotr

Teilenummer DS5000T-32-12
Beschreibung Soft Microcontroller
Hersteller Dallas Semiconducotr
Logo Dallas Semiconducotr Logo 




Gesamt 19 Seiten
DS5000T-32-12 Datasheet, Funktion
DS5000(T)
DS5000(T)
Soft Microcontroller Module
FEATURES
8–bit 8051 compatible Microcontroller adapts to task–
at–hand:
– 8 or 32K bytes of nonvolatile RAM for program
and/or data memory storage
– Initial downloading of software in end system
via on–chip serial port
– Capable of modifying its own program and/or
data memory in end use
Crashproof operation:
– Maintains all nonvolatile resources for 10 years
in the absence of VCC
– Power–fail reset
– Early warning power–fail interrupt
– Watchdog timer
Software Security Feature:
– Executes encrypted software to prevent unau-
thorized disclosure
On–chip, full–duplex serial I/O ports
Two on–chip timer/event counters
32 parallel I/O lines
Compatible with industry standard 8051 instruction
set and pinout
Optional Permanently Powered Real–Time Clock
(DS5000T)
PIN ASSIGNMENT
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
RXD P3.0
TXD P3.1
INT0 P3.2
INT1 P3.3
T0 P3.4
T1 P3.5
WR P3.6
RD P3.7
XTAL2
XTAL1
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 VCC
39 P0.0 AD0
38 P0.1 AD1
37 P0.2 AD2
36 P0.3 AD3
35 P0.4 AD4
34 P0.5 AD5
33 P0.6 AD6
32 P0.7 AD7
31 EA
30 ALE
29 PSEN
28 P2.7 A15
27 P2.6 A14
26 P2.5 A13
25 P2.4 A12
24 P2.3 A11
23 P2.2 A10
22 P2.1 A9
21 P2.0 A8
40–PIN ENCAPSULATED PACKAGE
DESCRIPTION
The DS5000(T) Soft Microcontroller Module is a fully
8051 compatible 8–bit CMOS microcontroller that offers
“softness” in all aspects of its application. This is ac-
complished through the comprehensive use of nonvola-
tile technology to preserve all information in the ab-
sence of system VCC. The internal program/data
memory space is implemented using either 8K or
32K bytes of nonvolatile CMOS SRAM. Furthermore,
internal data registers and key configuration registers
are also nonvolatile. An optional real time clock gives
permanently powered timekeeping. The clock keeps
time to a hundredth of a second using an on–board
crystal.
021998 1/19






DS5000T-32-12 Datasheet, Funktion
DS5000(T)
PROGRAM LOADING CONFIGURATIONS Figure 3
PROGRAM
ADDRESS
VCC GND
DS5000
A7–A0
P1.7–
P1.0
P0.7–
P0.0
D7–D0
PROGRAM
DATA IN/VERIFY
DATA OUT
A11–A8
P2.3–
P2.0
P3.7–
P3.4
A15–A12
PROGRAM
ADDRESS
PROGRAM
CONTROL
EA/VPP
ALE/PROG
P2.7
P2.6
P2.5
XTAL1
XTAL2
RST
PSEN
R<2K
11.059 MHz
VCC GND
DS5000
P1.7–
P1.0
P0.7–
P0.0
P2.5–
P2.0
P3.7–
P3.2
P2.6
P2.7
TXD
RXD
DRIVE/
RCV
RS232C
XTAL1
XTAL2
RST
PSEN
R<2K
PARALLEL
LOADING
Table 1 summarizes the selection of the available Paral-
lel Program Load cycles. The timing associated with
these cycles is illustrated in the electrical specs.
SERIAL BOOTSTRAP LOADER
The Serial Program Load Mode is the easiest, fastest,
most reliable, and most complete method of initially
loading application software into the DS5000(T) nonvol-
atile RAM. Communication can be performed over a
standard asynchronous serial communications port. A
typical application would use a simple RS232C serial in-
terface to program the DS5000(T) as a final production
procedure. The hardware configuration which is re-
quired for the Serial Program Load mode is illustrated in
Figure 3. Port pins 2.7 and 2.6 must be either open or
pulled high to avoid placing the DS5000(T) in a parallel
load cycle. Although an 11.0592 MHz crystal is shown
in Figure 3, a variety of crystal frequencies and loader
baud rates are supported, shown in Table 2. The serial
loader is designed to operate across a three–wire inter-
face from a standard UART. The receive, transmit, and
ground wires are all that are necessary to establish
communication with the DS5000(T).
The Serial Bootstrap Loader implements an easy–to–
use command line interface which allows an application
SERIAL
LOADING
program in an Intel hex representation to be loaded into
and read back from the device. Intel hex is the typical
format which existing 8051 cross–assemblers output.
The serial loader responds to single character com-
mands which are summarized below:
COMMAND
C
D
F
K
L
R
T
U
V
W
Z
P
G
FUNCTION
Return CRC–16 checksum of em-
bedded RAM
Dump Intel Hex File
Fill embedded RAM block with
constant
Load 40–bit Encryption Key
Load Intel Hex File
Read MCON register
Trace (Echo) incoming Intel Hex
data
Clear Security Lock
Verify Embedded RAM with in-
coming Intel Hex
Write MCON register
Set Security Lock
Put a value to a port
Get a value from a port
021998 6/19

6 Page









DS5000T-32-12 pdf, datenblatt
DS5000(T)
EXPANDED DATA MEMORY WRITE CYCLE
ALE
27
PSEN
WR
PORT 0
PORT 2
21
15
23
34
A7–A0
(Rn OR DPL)
24
DATA OUT
22
P2.7–P2.0 OR A15–A8 FROM PDH
25
A7–A0
(PCL)
INSTR
IN
A15–A8 FROM PCH
EXTERNAL CLOCK TIMING
28
29
30
31
1
021998 12/19

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