7220 datasheet(192/303 Pages) RENESAS

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APPLICATION

5.3 Usage example of ROM correction function (M37221M8/MA-XXXSP)

7220 Group User’s Manual

5-19

Fig. 5.3.6 General flowchart when using ROM correction function

5.3.4 General flowchart

Figure 5.3.6 shows the general flowchart when using ROM correction function. E2PROM addresses in the

flowchart corresponds to E2PROM map (refer to “Figures 5.3.4 and 5.3.5”).

START

Use ROM correction function 1 ?

Yes

After reset release, read the data

from E2PROM

• ROM correction function 1 (address 000 16)

• ROM correction function 2 (address 023 16)

←5516: valid, others: invalid

• ROM correction address 1 (high-order)

← 00116 of E2PROM

• ROM correction address 1 (low-order)

← 00216 of E2PROM

address 02C016 to 02DF16

← 00316 to 02216 of E2PROM

ROM correction enable register

(b0 at address 021B 16)← “0” (disabled)

Use ROM correction function 2 ?

Yes

• ROM correction address 2 (high-order)

← 02416 of E2PROM

• ROM correction address 1 (low-order)

← 02516 of E2PROM

address 02E0 16 to 02FF16

← 02616 to 04516 of E2PROM

ROM correction enable register

(b1 at address 021B 16)

← “1” (enabled)

ROM correction enable register

(b1 at address 021B 16)

← “0” (disabled)

END

Store execution address

into ROM correction address 1.

Store correction codes of ROM

correction function 1 into ROM

correction memory 1 (block 1).

Enable block 1 enable bit.

Store execution address

into ROM correction address 2.

Store correction codes of ROM

correction function 2 into ROM

correction memory 2 (block 2).

Enable block 2 enable bit.

Disable block 2 enable bit.

ROM correction enable register

(b0 at address 021B 16)

← “1” (enabled)

Disable block 1 enable bit.

Valid/invalid

address 0218

address 0217

address 021A

address 0219

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