COP8SCR9KMT7 datasheet(30/80 Pages) NSC

30 / 80 page

11.0 In-System Programming

(Continued)

11.6 RETURN TO FLASH MEMORY WITHOUT

HARDWARE RESET

After programming the entire program memory, including

options, it is necessary to exit the Boot ROM and return to

the flash program memory for program execution. Upon

receipt and completion of the EXIT command through the

MICROWIRE/PLUS ISP, the ISP code will reset the part and

begin execution from the flash program memory as de-

scribed in the Reset section. This assumes that the FLEX bit

in the Option register was programmed to 1.

11.7 MICROWIRE/PLUS ISP

National Semiconductor provides a program, which is avail-

able from our web site at www.national.com/cop8, that is

capable of programming a device from the parallel port of a

PC. The software accepts manually input commands and is

capable of downloading standard Intel HEX Format files.

Users who wish to write their own MICROWIRE/PLUS ISP

host software should refer to the COP8 FLASH ISP User

Manual, available from the same web site. This document

includes details of command format and delays necessary

between command bytes.

The MICROWIRE/PLUS ISP supports the following features

and commands:

•

Write a value to the ISP Write Timing Register. NOTE:

This

must

the

first

command

after

entering

MICROWIRE/PLUS ISP mode.

•

Erase the entire flash program memory (mass erase).

•

Erase a page at a specified address.

•

Read Option register.

•

Read a byte from a specified address.

•

Write a byte to a specified address.

•

Read multiple bytes starting at a specified address.

•

Write multiple bytes starting at a specified address.

•

Exit ISP and return execution to flash program memory.

The following table lists the MICROWIRE/PLUS ISP com-

mands and provides information on required parameters and

return values.

TABLE 10. MICROWIRE/PLUS ISP Commands

Command

Function

Command

Value (Hex)

Parameters

Return Data

PGMTIM_SET

Write Pulse Timing

0x3B

Value

N/A

PAGE_ERASE

Page Erase

0xB3

Starting Address of

Page

N/A

MASS_ERASE

Mass Erase

0xBF

Confirmation Code

N/A (The entire Flash

Memory will be erased)

READ_BYTE

Read Byte

0x1D

Address High, Address

Low

Data Byte if Security not

set. 0xFF if Security set.

Option Register if address

= 0xFFFF, regardless of

Security

BLOCKR

Block Read

0xA3

Address High, Address

Low, Byte Count (n)

High, Byte Count (n)

Low

≤ n ≤ 32767

n Data Bytes if Security

not set.

n Bytes of 0xFF if

Security set.

WRITE_BYTE

Write Byte

0x71

Address High, Address

Low, Data Byte

N/A

BLOCKW

Block Write

0x8F

Address High, Address

Low, Byte Count (0

≤ n

≤ 16), n Data Bytes

N/A

EXIT

0xD3

N/A

N/A (Device will Reset)

INVALID

N/A

Any other invalid

command will be

ignored

N/A

Note: The user must ensure that Block Writes do not cross a 64 byte boundary within one operation.

11.8 USER ISP AND VIRTUAL E

The following commands will support transferring blocks of

data from RAM to flash program memory, and vice-versa.

The user is expected to enforce application security in this

case.

•

Erase the entire flash program memory (mass erase).

NOTE: Execution of this command will force the device

into the MICROWIRE/PLUS ISP mode.

•

Erase a page of flash memory at a specified address.

•

Read a byte from a specified address.

•

Write a byte to a specified address.

COP8SCR9KMT7 Datasheet(PDF) 30 Page - National Semiconductor (TI)

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