SH7059 Datasheet, PDF (872/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

25. ROM (SH7059)
Host
Boot Program
H'00 (30 times maximum)
H'00 (Completion of adjustment)
H'55
H'E6 (Response to boot)
H'FF (Error)
Measuring the
1-bit length
Figure 25.27 Bit-Rate-Adjustment Sequence
• Communications protocol
After adjustment of the bit rate, the protocol for serial communications between the host and the boot program is as
shown below.
(1) One-byte commands and one-byte responses
These commands and responses are comprised of a single byte. These consists of the inquiries and ACK for
successful completion.
(2) n-byte commands or n-byte responses
These commands and responses are comprised of n bytes of data. These are selections and responses to inquiries.
The amount of programming data is not included under this heading because it is determined in another command.
(3) Error response
The error response is a response to inquiries. It consists of an error response and an error code and which take up
two bytes.
(4) Programming of 128 bytes
The size is not specified in commands. The data size is indicated in response to the programming unit inquiry.
(5) Memory read response
This response consists of four bytes of data.
Rev.3.00 Mar. 12, 2008 Page 782 of 948
REJ09B0177-0300