r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1163

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

The selection commands, which are device selection (H'10), clock mode selection (H'11), and new
bit rate selection (H'3F), should be sent from the host in that order. These commands will certainly
be needed. When two or more selection commands are sent at once, the last command will be
valid.
All of these commands, except for the boot program status inquiry command (H'4F), will be valid
until the boot program receives the programming/erasing transition command (H'40). The host can
choose the needed commands out of the commands and inquiries listed above. The boot program
status inquiry command (H'4F) is valid even after the boot program has received the
programming/erasing transition command (H'40).
(a)
The boot program will return the device codes of supported devices and the product name in
response to the supported device inquiry.
• Command, H'20, (one byte): Inquiry regarding supported devices
• Response, H'30, (one byte): Response to the supported device inquiry
• Size (one byte): Number of bytes to be transmitted, excluding the command, size, and
• Number of devices (one byte): The number of device types supported by the boot program
• Number of characters (one byte): The number of characters in the device codes and boot
• Device code (four bytes): ASCII code of the supporting product
• Product name (n bytes): Type name of the boot program in ASCII-coded characters
• SUM (one byte): Checksum
Command
Response
checksum, that is, the amount of data contributes by the number of devices, characters, device
codes and product names
program’s name
The checksum is calculated so that the total of all values from the command byte to the SUM
byte becomes H'00.
Supported Device Inquiry
H'20
H'30
Number of
characters
···
SUM
Size
Device code
Number of devices
Rev. 1.00 Sep. 19, 2008 Page 1133 of 1342
Product name
Section 22 Flash Memory
REJ09B0467-0100