
R8C/14 Group, R8C/15 Group 18. Flash Memory Version
Rev.2.10 Jan 19, 2006 Page 191 of 253
REJ09B0164-0210
18. Flash Memory Version
18.1 Overview
In the flash memory version, rewrite operations to the flash memory can be performed in three modes;
CPU rewrite, standard serial I/O, parallel I/O modes.
Table 18.1 lists the Flash Memory Version Performance (see
Table 1.1 Performance Outline of the R8C/
14 Group and
Table 1.2 Performance Outline of the R8C/15 Group for the items not listed on Table
18.1).
NOTES:
1. Definition of program and erase endurance.
The program and erase endurance is defined to be per-block. When the program and erase
endurance is n times (n=100 or 10,000 times), to erase n times per block is possible. For example, if
performing one-byte write to the distinct addresses on Block A of 1K-byte block 1,024 times and
then erasing that block, the program and erase endurance is counted as one time. If rewriting more
than 100 times, execute the program until the blank areas are all used to reduce the substantial
rewrite endurance and then erase. Do not rewrite only particular blocks and rewrite to average the
program and erase endurance to each block. Also keep the erase endurance as information and set
up the limit endurance.
2. Blocks A and B are embedded only in the R8C/15 group.
Table 18.1 Flash Memory Version Performance
Item Specification
Flash Memory Operating Mode 3 modes (CPU rewrite, standard serial I/O, and parallel I/O mode)
Division of Erase Block See
Figure 18.1 and Figure 18.2
Program Method Byte unit
Erase Method Block erase
Program, Erase Control Method Program and erase control by software command
Rewrite Control Method Rewrite control for Block 0 and 1 by FMR02 bit in FMR0 register
Rewrite control for Block 0 by FMR16 bit and Block 1 by FMR16 bit
Number of Commands 5 commands
Program and
Erase
Endurance
(1)
Block0 and 1
(Program ROM)
R8C/14 Group : 100 times ; R8C/15 Group : 1,000 times
BlockA and B
(Data flash)
(2)
10,000 times
ID Code Check Function Standard serial I/O mode supported
ROM Code Protect For parallel I/O mode supported
Comentarios a estos manuales