7906 datasheet(392/531 Pages) RENESAS

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FLASH MEMORY VERSION

7906 Group User’s Manual Rev.2.0

19-15

19.2 Flash memory CPU reprogramming mode

(5) Block erase command

Writing of command code “2016” at the 1st bus

cycle and “D016” to the highest address (here,

A0 = 0) of the block to be erased at the 2nd

bus cycle initiate the automatic erase (erase

and erase-verify) operation for the specified

block. During the automatic erase operation,

be sure not to access the flash memory or not

to execute the next command. The completion

of the automatic erase operation can be

recognized by the RY/BY status bit (bit 0 at

address 9E16).

After the automatic erase operation is completed,

the result of it can be recognized by reading

out the status register. (Refer to section “19.2.5

Full status check.”)

Figure 19.2.4 shows the block erase operation

flowchart.

(6) Erase-all-blocks command

Writing of command code “2016” at the 1st bus

cycle and “2016” at the 2nd bus cycle initiate

the automatic erase (erase and erase-verify)

operation for all the blocks. During the automatic

erase operation, be sure not to access the flash

memory or not to execute the next command.

The completion of the automatic erase operation

can be recognized by the RY/BY status bit (bit

0 at address 9E16).

After the automatic erase operation is completed,

the result of it can be recognized by reading

out the status register. (Refer to section “19.2.5

Full status check.”)

Figure 19.2.5 shows the erase-all-blocks

operation flowchart.

Fig. 19.2.4 Block erase operation flowchart

Fig. 19.2.5 Erase-all-blocks operation flowchart

Full status check

Start

Command code

“2016” is written.

“D016” is written to the highest

address of the block.

Block erase operation is

completed.

YES

••• See Figure 19.2.6.

RY/BY status bit = “1”?

(bit 0 at address 9E16)

YES

RY/BY status bit = “1”?

(bit 0 at address 9E16)

Full status check

Start

Command code

“20 16” is written.

Erase-all-blocks

operation is completed.

••• See Figure 19.2.6.

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