Section 6 ROM
Rev. 6.00 Aug 04, 2006 page 193 of 680
REJ09B0145-0600
CE
A15
−
A0
OE
WE
I/O7
−
I/O0
t
acc
t
ce
t
oe
t
oe
t
ce
t
acc
t
oh
t
df
t
df
t
oh
Address stable
Address stable
Figure 6.16
CE
CE
CE
CE
and
OE
OE
OE
OE
Clock System Read Timing Waveforms
6.10.4
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 6.17). 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 6.18 shows the AC characteristics.
Содержание H8/38342
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