r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 977

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

• Communications protocol
Formats in the communications protocol between the host and boot program after completion of
the bit-rate matching are as follows.
1. One-character command or one-character response
2. n-character command or n-character response
3. Error response
4. 128-byte programming command
5. Response to a memory reading command
A command or response consisting of a single character used for an inquiry or the ACK code
indicating normal completion.
A command or response that requires n bytes of data, which is used as a selection command or
response to an inquiry. The length of programming data is treated separately below.
Response to a command in case of an error: two bytes, consisting of the error response and
error code.
The command itself does not include data-size information. The data length is known from the
response to the command for inquiring about the programming size.
This response includes four bytes of size information.
Host
Figure 22.23 Sequence of Bit-Rate Matching
H'00 (bit rate matching complete)
H'00 (max. 30 times)
H'E6 (response)
H'FF (error)
H'55
Rev. 1.00 Sep. 21, 2007 Page 951 of 1124
Section 22 Flash Memory
length of one bit
Measures the
Boot program
REJ09B0402-0100