HD64F2149YV datasheet(755/1075 Pages) RENESAS

755 / 1075 page

Section 22 ROM

Rev. 3.00 Jan 18, 2006 page 727 of 1044

REJ09B0280-0300

Data

FA17 to FA0

FO7 to FO0

FO6

FO7

tnxtc

twsts

tnxtc

tces

tds

tdh

twep

tas

tah

tceh

Address

stable

Programming wait

Data transfer

1 byte to 128 bytes

H'40

Data

FO0 to 5 = 0

tspa

twrite (1 to 3000 ms)

Programming normal

end identification signal

Programming operation

end identification signal

Figure 22.20 Auto-Program Mode Timing Waveforms

Notes on Use of Auto-Program Mode

• 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.

• The lower 8 bits of the transfer address must be H'00 or H'80. 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.

• Memory address transfer is performed in the second cycle (figure 22.20). Do not perform

transfer after the second cycle.

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

• Perform one auto-programming operation for a 128-byte block for each address.

Characteristics are not guaranteed for two or more programming operations.

• Confirm normal end of auto-programming by checking FO6. Alternatively, status read mode

can also be used for this purpose (FO7 status polling uses the auto-program operation end

identification pin).

• The status polling FO6 and FO7 pin information is retained until the next command write.

Until the next command write is performed, reading is possible by enabling

CE and OE.

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