hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 210

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 ROM
6.7.3
1. You must use the system clock oscillator when programming or erasing flash memory on the
2. On the H8/38124 Group the watchdog timer operates after a reset is canceled. When executing
6.8
A software method using the CPU is employed to program and erase flash memory in the on-
board programming modes. Depending on the FLMCR1 setting, the flash memory operates in one
of the following four modes: Program mode, program-verify mode, erase mode, and erase-verify
mode. The programming control program in boot mode and the user program/erase control
program in user program mode use these operating modes in combination to perform
programming/erasing. Flash memory programming and erasing should be performed in
accordance with the descriptions in section 6.8.1, Program/Program-Verify and section 6.8.2,
Erase/Erase-Verify, respectively.
6.8.1
When writing data or programs to the flash memory, the program/program-verify flowchart shown
in figure 6.10 should be followed. Performing programming operations according to this
flowchart will enable data or programs to be written to the flash memory without subjecting the
chip to voltage stress or sacrificing program data reliability.
1. Programming must be done to an empty address. Do not reprogram an address to which
2. Programming should be carried out 128 bytes at a time. A 128-byte data transfer must be
3. Prepare the following data storage areas in RAM: A 128-byte programming data area, a 128-
Rev. 7.00 Mar 10, 2005 page 168 of 652
REJ09B0042-0700
H8/38124 Group. The on-chip oscillator should not be used for programming or erasing flash
memory. See section 4.2, On-Chip Oscillator Selection Method, for information on switching
between the system clock oscillator and the on-chip oscillator.
a program prepared by the user that performs programming and erasing in the user mode, the
watchdog timer’s overflow cycle should be set to an appropriate value. Refer to section 6.8.1,
Program/Program-Verify, for information on the appropriate watchdog timer overflow cycle
for programming, and refer to section 6.8.2, Erase/Erase-Verify, for information on the
appropriate watchdog timer overflow cycle for erasing.
programming has already been performed.
performed even if writing fewer than 128 bytes. In this case, H'FF data must be written to the
extra addresses.
byte reprogramming data area, and a 128-byte additional-programming data area. Perform
Notes on On-Board Programming
Flash Memory Programming/Erasing
Program/Program-Verify