Datasheet

Section 7 ROM
Page 180 of 982 REJ09B0465-0300 Rev. 3.00
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
Table 7.5 Inquiry/Selection Commands
Command Command Name Function
H'20 Supported-device inquiry Obtains the device code and product name.
H'10 Device selection Selects a device (code)
H'21 Clock mode inquiry Obtains the number of selectable clock
modes and the values corresponding to each
of the modes.
H'11 Clock mode selection Selects the clock mode
H'22 Frequency-division-ratio inquiry Obtains the number of frequency types, the
number of frequency division ratios, and the
specific frequency division ratio values
H'23 Operating-frequency inquiry Obtains the maximum and minimum
operating values for operating frequency of
the main and peripheral clocks
H'25 Programmable ROM information
inquiry
Obtains the number of programmable ROM
area and start and end addresses of each
area
H'26 Erasure-block information inquiry Obtains the number of blocks and the start
and end addresses of each block
H'27 Programming-size inquiry Obtains the size of the unit for programming
H'2A Data flash inquiry Checks whether or not data flash is present
H'2B Data flash information inquiry Obtains the number of data flash areas and
the start and end addresses of each area
H'2C Clock switching information inquiry Checks whether or not switching between an
internal and external clock source is possible
H'3F New bit-rate selection Selects a new bit rate
H'40 Programming/erasure state transition Erases the user ROM area and entering the
programming/erasure state
H'4F Boot-program state inquiry Checks the state of processing by the boot
program.
H'60 ID authentication Obtains the ID code of the programmable
ROM.
The selection commands should be transmitted from the host in the following order: device
selection (H'10), clock mode selection (H'11), and new bit-rate selection (H'3F). If the same
selection command is transmitted more than one time, the last one is valid.