SH7144_08 Datasheet, PDF (703/930 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series

19. Flash Memory (F-ZTAT Version)
19.2 Mode Transitions
When the mode pin and the FWP pin are set in the reset state and a reset-start is executed, this LSI
enters an operating mode as shown in figure 19.2. In user mode, flash memory can be read but not
programmed or erased.
The boot mode, user program mode, and PROM programmer modes are provided as modes to
write and erase the flash memory.
The differences between boot mode and user program mode are shown in table 19.1.
Figure 19.3 shows boot mode, and figure 19.4 shows user program mode.
*¹
User mode
MD1 = 1,
FWP = 1
RES = 0
Reset state
(on-chip ROM
enabled)
MD1 = 1,
FWP = 0 ^{RES = 0}
*²
FWP = 0 ^{FWP = 1}
MD1 = 0, RES = 0
FWP = 0
User
*¹
program mode
RES = 0
PROM
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 PROM programmer mode by using the dedicated PROM programmer.
Figure 19.2 Flash Memory State Transitions
Rev.4.00 Mar. 27, 2008 Page 659 of 882
REJ09B0108-0400