SH7052 datasheet(755/919 Pages) RENESAS

755 / 919 page

729

A18 to A0

I/O7 to I/O0

VIH

tacc

tce

toe

tce

tacc

toh

tdf

toh

Address stable

Figure 20.24

CE and OE Clock System Read Timing Waveforms

20.11.4

Auto-Program Mode

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

by executing 128 consecutive byte transfers.

2. 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.

3. 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.

4. Memory address transfer is performed in the second cycle (figure 20.25). Do not perform

transfer after the second cycle.

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

6. 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.

7. 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).

8. 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.

SH7052 Datasheet(PDF) 755 Page - Renesas Technology Corp