HD64F2168 Datasheet, PDF (714/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

(4) Inquiry and Selection States
The boot program returns information from the flash memory in response to the host’s inquiry
commands and sets the device code, clock mode, and bit rate in response to the host’s selection
command.
Inquiry and selection commands are listed below.
Table 20.11 Inquiry and Selection Commands
Command
H'20
H'10
H'21
H'11
H'22
H'23
H'24
H'25
H'26
H'27
H'3F
H'40
H'4F
Command Name
Description
Supported Device Inquiry
Inquiry regarding device codes
Device Selection
Selection of device code
Clock Mode Inquiry
Inquiry regarding numbers of clock modes and
values of each mode
Clock Mode Selection
Indication of the selected clock mode
Multiplication Ratio Inquiry
Inquiry regarding the number of frequency-
multiplied clock types, the number of
multiplication ratios, and the values of each
multiple
Operating Clock Frequency Inquiry Inquiry regarding the maximum and minimum
values of the main clock and peripheral clocks
User Boot MAT Information Inquiry Inquiry regarding the number of user boot
MATs and the start and last addresses of
each MAT
User MAT Information Inquiry
Inquiry regarding the a number of user MATs
and the start and last addresses of each MAT
Block for Erasing Information
Inquiry
Inquiry regarding the number of blocks and
the start and last addresses of each block
Programming Unit Inquiry
Inquiry regarding the unit of programming data
New Bit Rate Selection
Selection of new bit rate
Transition to Programming/Erasing Erasing of user MAT and user boot MAT, and
State
entry to programming/erasing state
Boot Program Status Inquiry
Inquiry into the operated status of the boot
program
The selection commands, which are device selection (H'10), clock mode selection (H'11), and new
bit rate selection (H'3F), should be sent from the host in that order. These commands will certainly
be needed. When two or more selection commands are sent at once, the last command will be
valid.
All of these commands, except for the boot program status inquiry command (H'4F), will be valid
until the boot program receives the programming/erasing transition (H'40). The host can choose
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