Renesas H8S/2100 Series Hardware Manual page 811

When the new bit rate is selectable, the rate will be set in the register after sending ACK in
response. The host will send an ACK with the new bit rate for confirmation and the boot program
will response with that rate.
Confirmation H'06
• Confirmation, H'06, (one byte): Confirmation of a new bit rate
Response H'06
• Response, H'06, (one byte): Response to confirmation of a new bit rate
The sequence of new bit-rate selection is shown in figure 24.21.
Host
Waiting for one-bit period
at the specified bit rate
Setting a new bit rate
(5) Transition to Programming/Erasing State
The boot program will transfer the erasing program and erase the data in the user MATs first , then
the data in the user boot MATs. On completion of this erasure, ACK will be returned and the
program will enter the programming/erasing state.
The host should select the device code, clock mode, and new bit rate with device selection, clock-
mode selection, and new bit-rate selection commands, and then send the command for the
transition to programming/erasing state. These procedures should be carried out before sending of
the programming selection command or program data.
Command H'40
• Command, H'40, (one byte): Transition to programming/erasing state
Setting a new bit rate
H'06 (ACK) with the new bit rate
H'06 (ACK) with the new bit rate
Figure 24.21 New Bit-Rate Selection Sequence
H'06 (ACK)
Rev. 1.00 May 09, 2008 Page 785 of 954
Section 24 Flash Memory
Boot program
Setting a new bit rate
REJ09B0462-0100