R5F72115D160FPV datasheet(975/1228 Pages) RENESAS

975 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 951 of 1200

REJ09B0344-0200

Host

Boot program

H'00 (max. 30 times)

H'00 (bit rate matching complete)

H'55

H'E6 (response)

H'FF (error)

Measures the

length of one bit

Figure 21.20 Sequence of Bit-Rate Matching

(3)

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

A command or response consisting of a single character used for an inquiry or the ACK code

indicating normal completion.

2. n-character command or n-character response

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.

3. Error response

Response to a command in case of an error: two bytes, consisting of the error response and

error code.

4. 256-byte programming command

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.

5. Response to a memory reading command

This response includes four bytes of size information.

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