Auto-Program Mode; Figure 6.16 Ce And Oe Clock System Read Timing Waveforms - Renesas H8/3847R Series Hardware Manual

A15−A0
CE
OE
WE
I/O7−I/O0
Figure 6.16 CE
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.
Address stable
t
ce
t
oe
t
acc
t
oh
CE and OE OE Clock System Read Timing Waveforms
CE CE OE OE
Address stable
t
ce
t
oe
t
acc
t
t
df
oh
Rev. 6.00 Aug 04, 2006 page 193 of 680
Section 6 ROM
t
df
REJ09B0145-0600