D12320VF25V Datasheet, PDF (785/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
17.28.4 Auto-Program Mode
(1) In auto-program mode, programming is in 128-byte units. That is, 128 bytes of data are
transferred in succession.
(2) Even in the programming of less than 128 bytes, 128 bytes of data must be transferred. H'FF
should be written to those addresses that are unnecessarily written to.
(3) Set the low seven bits of the address to be transferred to low level. Inputting an invalid address
will result in a programming error, although processing will proceed to the memory-
programming operation.
(4) The memory address is transferred in the 2nd cycle. Do not transfer addresses in the 3rd or
later cycles.
(5) Do not issue commands while programming is in progress.
(6) When programming, execute automatic programming once for each 128-byte block of
addresses. Programming the block at an address where programming has already been
performed is not possible.
(7) To confirm the end of automatic programming, check the signal on the I/O₆ pin. Confirmation
in the status-read mode is also possible (status polling of the I/O₇ pin is used to check the end
status of automatic programming).
(8) Status-polling information on the I/O₆ and I/O₇ pins is retained until the next command is
written. As long as no command is written, the information is made readable by setting CE and
OE for enabling.
For the AC characteristics in auto-program mode, see section 17.29.2, AC Characteristics and
Timing in PROM Mode.
17.28.5 Auto-Erase Mode
(1) Auto-erase mode only supports erasing of the entire memory.
(2) Do not perform command writing during auto erasing is in progress.
(3) To confirm the end of automatic erasing, check the signal on the I/O₆ pin. Confirmation in the
status-read mode is also possible (status polling of the I/O₇ pin is used to check the end status
of automatic erasure).
(4) Status polling information on the I/O₆ and I/O₇ pins is retained until the next command writing.
As long as no command is written, the information is made readable by setting CE and OE for
enabling.
For the AC characteristics in auto-erase mode, see section 17.29.2, AC Characteristics and Timing
in PROM Mode.
Rev.7.00 Feb. 14, 2007 page 751 of 1108
REJ09B0089-0700