DS5000 datasheet(7/19 Pages) DALLAS

7 / 19 page

DS5000(T)

021998 7/19

PARALLEL PROGRAM LOAD CYCLES Table 1

MODE

RST

PSEN

PROG

P2.7

P2.6

P2.5

Program

VPP

Security Set

VPP

Verify

Prog Expanded

VPP

Verify Expanded

Prog MCON or Key registers

VPP

Verify MCON registers

The Parallel Program Cycle is used to load a byte of

data into a register or memory location within the

DS5000(T). The Verify Cycle is used to read this byte

back for comparison with the originally loaded value to

verify proper load ing. The Security Set Cycle may be

used to enable and the Software Security feature of the

DS5000(T). One may also enter bytes for the MCON

gram MCON cycle. When using this cycle, the absolute

in the normal program cycle (Port 2 should be 00H). The

MCON contents can likewise be verified using the Verify

MCON cycle.

When the DS5000(T) first detects a Parallel Program

Strobe pulse or a Security Set Strobe pulse while in the

Program Load Mode following a Power–On Reset, the

internal hardware of the DS5000(T) is initialized so that

an existing 4K byte program can be programmed into a

DS5000(T) with little or no modification. This initializa-

tion automatically sets the Range Address for 8K bytes

and maps the lowest 4K byte bank of Embedded RAM

as program memory. The next 4K bytes of Embedded

RAM are mapped as Data Memory.

In order to program more than 4K bytes of program

code, the Program/Verify Expanded cycles can be

used. Up to 32K bytes of program code can be entered

and verified. Note that the expanded 32K byte Program/

Verify cycles take much longer than the normal 4K byte

Program/Verify cycles.

A typical parallel loading session would follow this pro-

cedure. First, set the contents of the MCON register

with the correct range and partition only if using expand-

ed programming cycles. Next, the encryption registers

can be loaded to enable encryption of the program/data

memory (not required). Then, program the DS5000(T)

using either normal or expanded program cycles and

check the memory contents using Verify cycles. The

last operation would be to turn on the security lock fea-

ture by either a Security Set cycle or by explicitly writing

to the MCON register and setting MCON.0 to a 1.

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