SH79F024XU datasheet(16/92 Pages) SINOWEALTH

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SH79F

SH79F082

082

7.3

7.3 Flash

Flash

Flash Program

Program

Program Memory

Memory

7.3.1

7.3.1 Features

Features

�

The program memory consists 8 X 1KB sectors, total 8KB

�

Programming and erase can be done over the full operation voltage range

�

Write, read and erase operation are all supported by In-Circuit Programming (ICP)

�

Fast mass/sector erase and programming

�

Minimum program/erase cycles: 100000

�

Minimum years data retention: 10

�

Low power consumption

The SH79F082 embeds 8K flash program memory for program code. The flash program memory provides electrical erasure

and programming and supports In-Circuit Programming (ICP) mode and Self-Sector Programming (SSP) mode.

Note

ote

ote:::: The last 64 bytes (1FC0H-1FFFH) is reserved, can’t be used as program memory.

In ICP mode, the programmer can do the all the operations to flash memory, such as erase or write. The read or write

operation of flash memory is done by byte, but the erase operation is done by sectors or whole chip.

In ICP mode, the sector erase operation can erase any flash sector except the sector 7. In SSP mode, the sector erase

function can erase any flash sector except the sector 7 and the sector that contains SSP code.

The mass-erase operation only support in ICP mode and this operation will erase the entire program memory including sector 7.

7.3.2

7.3.2 Flash

Flash

Flash O

Operation

peration

peration in

in ICP

ICP

ICP M

Mode

ode

ICP mode is performed without removing the micro-controller from the system. In ICP mode, the user system must be power-

off, and the programmer can refresh the program memory through ICP programming interface. The ICP programming

interface consists of 6 wires (VDD, GND, TCK, TDI, TMS, TDO).

At first the four JTAG pins (TDO, TDI, TCK, TMS) are used to enter the programming mode. Only after the three pins are

inputted the specified waveform, the CPU will enter the programming mode. For more detail description please refers to the

FLASH Programmer’s user guide.

The

The ICP

ICP

ICP M

Mode

ode

ode S

Supports

upports

upports the

the

the F

Following

ollowing

ollowing O

Operations

perations

perations::::

((((1

1)))) Code-Protect

Code-Protect

Code-Protect Control

Control

Control mode

mode

mode Programming

Programming

SH79F082 implements code-protect function to offer high safeguard for customer code. Two modes are available for each

sector.

Code-

ode-

ode-p

protect

rotect

rotect control

control

control mode

mode

mode 0

0:::: Used to enable/disable the write/read operation (except mass erase) from any programmer.

Code-

ode-

ode-p

protect

rotect

rotect control

control

control mode

mode

mode 1

1:::: Used to enable/disable the read operation through MOVC instruction from other sectors; or

the sector erase/write operation through SSP Function.

To enable the wanted protect mode, the user must use the Flash Programmer to set the corresponding protect bit.

((((2

2)))) Mass

Mass

Mass Erase

Erase

The mass erase operation will erase all the contents of program code, code option, code protect bit and customer code ID,

regardless the status of code-protect control mode. (The Flash Programmer supplies customer code ID setting function for

customer to distinguish their product.)

Mass erase is only available in Flash Programmer.

((((3

3)))) Sector

Sector

Sector Erase

Erase

The sector erase operation will erase the contents of program code of selected sector . This operation can be done by Flash

Programmer or the user’s program.

If done by the user’s program, the code-protect control mode 1 of the selected sector must be disabled.

f done by the Flash Programmer, the code-protect control mode 0 of the selected sector must be disabled.

Note:

Note: The last sector 7 (1800H-1FFFH) cannot be erased by sector erase.

((((4

4)))) Write/Read

Write/Read

Write/Read Code

Code

The Write/Read Code operation will write the customer code into the Flash Programming Memory or read the customer code

from the Flash Programming Memory. This operation can be done by Flash Programmer or the user’s program.

If done by the user’s program, the code-protect control mode 1 of the selected sector must be disabled. But the program can

read/write its own sector regardless of its security bit.

If done by the Flash Programmer, the code-protect control mode 0 of the selected sector must be disabled.

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