Figure 20.22 New Bit-Rate Selection Sequence - Renesas H8S/2437 Hardware Manual

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 20.22.
Waiting for one-bit period
at the specified bit rate
Setting a new bit rate
(6) Transition of Programming/Erasing State
The boot program will transfer the erasing program, and erase the user MATs and user boot MATs
in that order. On completion of this erasure, ACK will be returned and the programming/erasing
state will be entered.
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 to the boot program. 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
Response H'06
• Response, H'06, (one byte): Response to transition to programming/erasing state
ACK will be returned when the user MAT and user boot MAT have been erased by the
transferred erasing program.
Rev. 1.00, 09/03, page 596 of 704
Host
Setting a new bit rate
H'06 (ACK) with the new bit rate
H'06 (ACK) with the new bit rate

Figure 20.22 New Bit-Rate Selection Sequence

H'06 (ACK)
Boot program
Setting a new bit rate