Datasheet

Section 7 ROM
REJ09B0465-0300 Rev. 3.00 Page 193 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
Host
Boot program
Selects the new-bit-rate selection command.
H'06 (ACK)
Waits for one-bit period
at the selected bit rate.
H'06 (ACK) at the new bit rate
H'06 (ACK) at the new bit rate
Sets the new bit rate.
Sets the new bit rate.
Figure 7.9 Sequence of New Bit-Rate Selection
(5) Programming/Erasure State Transition (Without ID Checking)
In response to a programming/erasure state transition command, the boot program transfers the
erasure program to erase the data in the user ROM area. On completion of this erasure, the boot
program returns the ACK code and enters the programming/erasure state.
Before transmitting the programming selection command and data for programming, the host
should select the device, clock mode, and new bit rate for this LSI using the device selection,
clock-mode selection, and new-bit-rate selection commands; and then transmit a
programming/erasure state transition command to the boot program.
Command H'40
• Command H'40 (1 byte): Programming/erasure state transition
Response H'06
• Response H'06 (1 byte): Response to the programming/erasure state transition command
(without ID checking)
The ACK code is returned when the user ROM area have been successfully erased after
transfer of the erasure program.
Error response
H'C0 H'51