HD6417750RF240V Datasheet, PDF (491/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 18 ROM
Figure 18.3 shows the operation flow for boot mode and figure 18.4 shows that for user program
mode.
*1
User mode
(on-chip ROM
enabled)
MD1 = 1,
MD2 = 1,
FWE = 0
RES = 0
MD1 = 1,
MD2 = 1,
FWE = 1
FWE = 1 FWE = 0
User
*1
program mode
Reset state
RES = 0
MD2 = 0,
MD1 = 1,
FWE = 1
*2
RES = 0
RES = 0
Programmer
mode
On-board programming mode
Boot mode
Notes: Only make a transition between user mode and user program mode when the CPU is
not accessing the flash memory.
1. RAM emulation possible
2. This LSI transits to programmer mode by using the dedicated PROM programmer.
Figure 18.2 Flash Memory State Transitions
Table 18.1 Differences between Boot Mode and User Program Mode
Boot Mode
User Program Mode
Total erase
Yes
Yes
Block erase
No
Programming control program^*
(2)
Yes
(1) (2) (3)
(1) Erase/erase-verify
(2) Program/program-verify
(3) Emulation
Note: * To be provided by the user, in accordance with the recommended algorithm.
Rev. 7.00 Sep. 11, 2009 Page 455 of 566
REJ09B0211-0700