DS5000 datasheet(6/19 Pages) DALLAS

6 / 19 page

DS5000(T)

021998 6/19

PROGRAM LOADING CONFIGURATIONS Figure 3

PSEN

RST

D7–D0

A15–A12

PROGRAM

A7–A0

A11–A8

PROGRAM

ADDRESS

PROGRAM

CONTROL

VCC

GND

DS5000

P1.7–

P1.0

P2.3–

P2.0

EA/VPP

ALE/PROG

P2.7

P2.6

P2.5

XTAL1

XTAL2

P0.7–

P0.0

P3.7–

P3.4

PSEN

RST

VCC

GND

DS5000

P1.7–

P1.0

P2.5–

P2.0

XTAL1

XTAL2

P0.7–

P0.0

P3.7–

P3.2

11.059 MHz

TXD

RXD

DRIVE/

RCV

RS232C

R<2K

ADDRESS

PROGRAM

DATA IN/VERIFY

DATA OUT

R<2K

PARALLEL

SERIAL

P2.6

P2.7

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

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

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

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