r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 990

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 22 Flash Memory
Rev. 1.00 Sep. 21, 2007 Page 964 of 1124
REJ09B0402-0100
Acknowledge
Response
When the new bit rate is selectable, the boot program returns an ACK code to the host and then
makes the register setting to select the new bit rate. The host then sends an ACK code at the
new bit rate, and the boot program responds to this with another ACK code, this time at the
new bit rate.
 Acknowledge H'06 (1 byte): The ACK code sent by the host to acknowledge the new bit
 Response H'06 (1 byte): The ACK code transferred in response to acknowledgement of the
The sequence of new bit rate selection is shown in figure 22.25.
rate.
new bit rate
period at the current
Setting the new
Wait for one-bit
bit rate setting
bit rate
H'06
H'06
Host
Figure 22.25 Sequence of New Bit Rate Selection
H'06 (ACK) at the new bit rate
H'06 (ACK) at the new bit rate
New bit rate setting
H'06 (ACK)
New bit rate setting
Boot program