D12320VF25IV Datasheet, PDF (811/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 19 ROM
Table 19.15 PROM Mode Commands
Command Name
Number
of Cycles Mode
1st Cycle
Address Data
2nd Cycle
Mode Address Data
Memory read mode 1 + n
Write X
H'00
Read RA
Dout
Auto-program mode 129
Write X
H'40
Write PA
Din
Auto-erase mode
2
Write X
H'20
Write X
H'20
Status read mode 2
Write X
H'71
Write X
H'71
Legend:
RA: Read address
PA: Program address
Notes: 1. In auto-program mode, 129 cycles are required for command writing by a simultaneous
128-byte write.
2. In memory read mode, the number of cycles depends on the number of address write
cycles (n).
19.11.4 Memory Read Mode
• After the end of an auto-program, auto-erase, or status read operation, the command wait state
is entered. To read memory contents, a transition must be made to memory read mode by
means of a command write before the read is executed.
• Command writes can be performed in memory read mode, just as in the command wait state.
• Once memory read mode has been entered, consecutive reads can be performed.
• After power-on, memory read mode is entered.
Rev.6.00 Sep. 27, 2007 Page 779 of 1268
REJ09B0220-0600