SH79F024XU datasheet(22/92 Pages) SINOWEALTH

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SH79F

SH79F082

082

7.4.3

7.4.3 SSP

SSP

SSP Programming

Programming

Programming Notice

Notice

To successfully complete SSP programming, the user’s software must following the steps below:

(1)

(1) For

For

For Code/Data

Code/Data

Code/Data programming:

programming:

1. Disable interrupt;

2. Fill in the XPAGE, IB_OFFSET for the corresponding address;

3. Fill in IB_DATA if programming is wanted;

4. Fill in IB_CON1-5 sequentially;

5. Add 4 nops for more stable operation;

6. Code/Data programming, CPU will be in IDLE mode;

7. Go to Step 2 if more data are to be programmed;

8. Clear XPAGE; enable interrupt if necessary.

(2)

(2) For

For

For S

Sector

ector

ector E

Erase:

rase:

1. Disable interrupt;

2. Fill in the XPAGE for the corresponding sector;

3. Fill in IB_CON1-5 sequentially;

4. Add 4 NOPs for more stable operation;

5. Sector Erase, CPU will be in IDLE mode;

6. Go to step 2 if more sectors are to be erased;

7. Clear XPAGE; enable interrupt if necessary.

(3)

(3) For

For

For Code

Code

Code Reading:

Reading:

Just Use “MOVC A, @A+DPTR” or “MOVC A, @A+PC”.

7.4.4

7.4.4 8bits

8bits

8bits Read

Read

Read only

only

only Random

Random

Random Code

Code

SH79F082 has an unchanged 8bit random code, witch is a random data from 0 to 255. It can not be erased, but can be read

by program or programmer.

Table

Table 7

7....12

12 Flash Access Control Register

When read random code, first, set FAC as 1, make DPTR equal “007FH” and clear A, then read it by the instruction of

“MOVC A, @A+DPTR”.

Note:

Note: random code is not at program ROM. Instruction access random code or program ROM is judge by the bit of FAC. So

after read ramdom code make sure FAC equal 0, otherwise the program read error code.

A7H

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

FLASHCON

FAC

R/W

Reset

Reset Value

Value

((((POR/WDT/LVR/PIN

POR/WDT/LVR/PIN

POR/WDT/LVR/PIN))))

Bit

Bit Number

Number

Bit

Bit Mnemonic

Mnemonic

Description

FAC

FAC:

FAC: Flash

Flash

Flash access

access

access control

control

0: access main memory

1: access random code

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