r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1145

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

Table 22.5 EW0 Mode Specifications
Notes: 1. Make sure that no interrupt (except NMI) or DMA transfer is generated.
22.3.4
Setting the FMCMDEN bit in FLMCR1 to 1 shifts the flash memory into the user programming
mode, in which commands can be accepted. Figure 22.5 shows how to set and clear the EW0
mode.
Programming and erasure are controlled through software commands. The flash memory state
after programming or erasure can be checked through FLMSTR or the status register.
Item
Operating mode
Area for storing the programming
control program
Area for executing the
programming control program
Programmable area
Limitations on software
commands
Mode after programming or
erasure
CPU state during automatic
programming or erasure
Flash memory status detection
2. In the user programming mode, the programming control program should be executed
EW0 Mode
in the on-chip RAM or an external area.
Description
•
•
User ROM
The programming control program should be transferred to an
area outside the flash memory (such as RAM) before
execution*
User ROM
None
Read status register mode
Operating*
•
•
Single-chip mode
Memory-expanded mode
Reading the FMPRSF and FMERSF bits in FLMSTR by a
program.
Executing a read status register command to read the SR7,
SR5, and SR4 bits in the status register.
2
1
Rev. 1.00 Sep. 19, 2008 Page 1115 of 1342
Section 22 Flash Memory
REJ09B0467-0100