r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1133

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

The flash memory in this LSI can be accessed in three programming modes: user programming
mode, on-board programming mode, and programmer mode.
Table 22.1 gives an overview of the flash memory specifications (see section 1, Overview, for
items that are not shown in table 22.1).
Table 22.1 Overview of Flash Memory Specifications
Notes: 1. The flash memory can be programmed in byte units only in parallel I/O mode.
Item
Flash memory programming modes
Erase block division
Programming method
Erase method
Programming and erase control method
Commands
Programming and erase count
Data retention
2. The programming and erase count determine the number of times the erase operation
For example, if 1-word programming is done 2,048 times, each at a different address in
can be performed in each block.
a 4-Kbyte block and then the block is erased, this is counted as one erase count. If the
allowed programming and erase count are 100 times, each block can be erased 100
times.
Section 22 Flash Memory
User ROM
Description
Three modes (user programming mode, boot mode,
and programmer mode)
See figure 22.1.
Block units
Programming and erasure are controlled by
software commands
Six commands
100 times*
Ten years
Word or byte units*
2
Rev. 1.00 Sep. 19, 2008 Page 1103 of 1342
1
Section 22 Flash Memory
REJ09B0467-0100