H838532H datasheet(169/508 Pages) RENESAS

169 / 508 page

Section 6 ROM

Rev. 1.00 May 30, 2008 Page 149 of 484

REJ09B0436-0100

6.7.4

Auto-Program Mode

1. When reprogramming previously programmed addresses, perform auto-erasing before auto-

programming.

2. Perform auto-programming once only on the same address block. It is not possible to program

an address block that has already been programmed.

3. In auto-program mode, 128 bytes are programmed simultaneously. This should be carried out

by executing 128 consecutive byte transfers. A 128-byte data transfer is necessary even when

programming fewer than 128 bytes. In this case, H'FF data must be written to the extra

addresses.

4. The lower 7 bits of the transfer address must be low. If a value other than an effective address

is input, processing will switch to a memory write operation but a write error will be flagged.

5. Memory address transfer is performed in the second cycle (figure 6.11). Do not perform

transfer after the third cycle.

6. Do not perform a command write during a programming operation.

7. Perform one auto-program operation for a 128-byte block for each address. Two or more

additional programming operations cannot be performed on a previously programmed address

block.

8. Confirm normal end of auto-programming by checking I/O6. Alternatively, status read mode

can also be used for this purpose (I/O7 status polling uses the auto-program operation end

decision pin).

9. Status polling I/O6 and I/O7 pin information is retained until the next command write. As long

as the next command write has not been performed, reading is possible by enabling

CE and

OE.

10. Table 6.13 shows the AC characteristics.

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