H8S29 Datasheet, PDF (864/1304 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 19 ROM
Table 19.36 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).
19.20.4 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 832 of 1268
REJ09B0220-0600