Datasheet

Section 21 Flash Memory
R01UH0310EJ0500 Rev. 5.00 Page 1105 of 1384
Sep 25, 2012
H8S/2426, H8S/2426R, H8S/2424 Group
(4) Inquiry/Selection State
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 21.8 Inquiry and Selection Commands
Command Command Name Description
H'20 Supported device Inquiry Inquiry regarding device codes and product
name
H'10 Device selection Selection of device code
H'21 Clock mode inquiry Inquiry regarding numbers of clock modes and
values of each mode
H'11 Clock mode selection Indication of the selected clock mode
H'22 Multiplication ratio inquiry Inquiry regarding the number of frequency-
multiplied clock types, the number of
multiplication ratios, and the values of each
multiple
H'23 Operating clock frequency
inquiry
Inquiry regarding the maximum and minimum
values of the main clock and peripheral clocks
H'25 User ROM information inquiry Inquiry regarding the number of user ROMs
and the start and last addresses of each ROM
H'26 Erased block information
inquiry
Inquiry regarding the number of blocks and the
start and last addresses of each block
H'27 Programming unit inquiry Inquiry regarding the unit of programming data
H'3F New bit rate selection Selection of new bit rate
H'40 Transition to
programming/erasing state
Erasing of user ROM and entry to
programming/erasing state
H'4F Boot program status inquiry Inquiry regarding 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.