r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 976

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

Section 22 Flash Memory
• Bit-rate matching state
In bit-rate matching, the boot program measures the low-level intervals in a signal carrying H'00
data that is transmitted by the host, and calculates the bit rate from this. The bit rate can be
changed by the new-bit-rate selection command. On completion of bit-rate matching, the boot
program goes to the inquiry and selection state. The sequence of processing in bit-rate matching is
shown in figure 22.23.
Rev. 1.00 Sep. 21, 2007 Page 950 of 1124
REJ09B0402-0100
Wait for programming/erasure
user MAT/use boot MAT
selection
Erase
Figure 22.22 Flow of Processing by the Boot Program
Enter
programming/erasure state
Wait for inquiry and
Bit rate matching
selection
Programming
Reset
Programming
processing
Inquiry
Erasure
processing
processing
Erasure
Inquiry
Programming/erasure state
Inquiry-and-selection state
Selection
Checking
Bit rate matching state
processing
Checking
processing
Selection