r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1144

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

Section 22 Flash Memory
(3)
• The clock of 48 MHz needs to be supplied to the USB module. Set the external clock
• Use the P20 pin for the D+ pull-up control connection.
• For the stable supply of the power during the flash memory programming and erasing, the
• If the bus powered HUB is disconnected during the flash memory programming and erasing,
•
22.3.3
In the user programming mode, the flash memory can be programmed by the CPU through
execution of software commands. In this mode, the user ROM can be programmed without using a
ROM programmer with the microcomputer mounted on a system board.
The programming and block erase commands should be executed only in each block area of the
user program.
The user programming mode provides the erase/write 0 mode (EW0 mode). Table 22.5 gives an
overview of the EW0 mode specifications.
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REJ09B0467-0100
frequency and clock pulse generator so as to supply 48 MHz as the clock for the USB (cku).
For details, refer to section 24, Clock Pulse Generator.
cable should not be connected via the bus powered HUB.
permanent damage to the LSI may result.
transition to the software standby mode of the power-down mode.
If the USB bus in the bus power mode enters the suspend mode, this does not make the
Notes on USB Boot Mode Execution
User Programming Mode