19.22.5 Auto-Program Mode - Renesas H8S Series Hardware Manual

A to A
18 0
CE
OE
WE
I/O to I/O
7 0
A to A
18 0
CE
OE
WE
I/O to I/O
7 0

19.22.5 Auto-Program Mode

• In auto-program mode, 128 bytes are programmed simultaneously. For this purpose, 128 consecutive byte data
transfers should be performed.
• A 128-byte data transfer must be performed even if writing fewer than 128 bytes; in this case, H'FF data must be
written to the extra addresses.
• The lower 7 bits of the transfer address must be held low. If an invalid address is input, memory programming will be
started but a programming error will occur.
• Memory address transfer is executed in the second cycle (figure 19-59). Do not perform transfer later than 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. One or more additional programming
operations cannot be carried out on address blocks that have already been programmed.
• Confirm normal end of auto-programming by checking I/O
purpose (the I/O status polling pin is used to identify the end of an auto-program operation).
7
• Status polling I/O
and I/O
6
has not been performed, reading is possible by enabling CE and OE.
Address stable
VIL
VIL
t
VIH
acc
Figure 19-57 Timing Waveforms for CE/OE Enable State Read
Address stable
t
ce
t
oe
VIH
t
acc
Figure 19-58 Timing Waveforms for CE/OE Clocked Read
information is retained until the next command write. As long as the next command write
7
Address stable
t
acc
t
oh
Address stable
t
ce
t
acc
t
t
df
oh
. Alternatively, status read mode can also be used for this
6
t
oh
t
oe
t
df
t
oh
Rev.6.00 Oct.28.2004 page 653 of 1016
REJ09B0138-0600H