HD6432621 Hitachi, HD6432621 Datasheet - Page 704

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

19.11.4 Auto-Program Mode
1. In auto-program mode, 128 bytes are programmed simultaneously. This should be carried out
2. A 128-byte data transfer is necessary even when programming fewer than 128 bytes. In this
3. The lower 7 bits of the transfer address must be low. If a value other than an effective address
4. Memory address transfer is performed in the second cycle (figure 19-22). Do not perform
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
7. Confirm normal end of auto-programming by checking I/O6. Alternatively, status read mode
8. Status polling I/O6 and I/O7 pin information is retained until the next command write. As long
660
I/O7–I/O0
by executing 128 consecutive byte transfers.
case, H'FF data must be written to the extra addresses.
is input, processing will switch to a memory write operation but a write error will be flagged.
transfer after the third cycle.
additional programming operations cannot be performed on a previously programmed address
block.
can also be used for this purpose (I/O7 status polling uses the auto-program operation end
decision pin).
as the next command write has not been performed, reading is possible by enabling CE and
OE.
A18–A0
WE
OE
CE
Figure 19-21 CE and OE Clock System Read Timing Waveforms
V
IH
Address stable
t
acc
t
ce
t
oe
t
oh
t
df
Address stable
t
acc
t
ce
t
oe
t
oh
t
df