SH7144_08 Datasheet, PDF (714/930 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series

19. Flash Memory (F-ZTAT Version)
19.6 On-Board Programming Modes
There are two modes for programming/erasing of the flash memory; boot mode, which enables on-
board programming/erasing, and PROM programmer mode, in which programming/erasing is
performed with a PROM programmer. On-board programming/erasing can also be performed in
user program mode. At reset-start in reset mode, this LSI changes to a mode depending on the MD
pin settings and FWP pin setting, as shown in table 19.3.
When changing to boot mode, the boot program built into this LSI is initiated. The boot program
transfers the programming control program from the externally-connected host to on-chip RAM
via SCI1. After erasing the entire flash memory, the programming control program is executed.
This can be used for programming initial values in the on-board state or for a forcible return when
programming/erasing can no longer be done in user program mode. In user program mode,
individual blocks can be erased and programmed by branching to the user program/erase control
program prepared by the user.
Table 19.3 Setting On-Board Programming Modes
MD1
0
1
MD0
0
1
0
1
FWP
0
LSI State after Reset End
Boot mode
User program mode
Expanded mode
Single-chip mode
Expanded mode
Single-chip mode
Rev.4.00 Mar. 27, 2008 Page 670 of 882
REJ09B0108-0400