Datasheet

Section 7 ROM
REJ09B0465-0300 Rev. 3.00 Page 189 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
• Number of areas (1 byte): The number of contiguous data-flash areas
H'01: Consecutive data flash areas
H'00: No data flash area
• Start address of an area (4 bytes): Address where the area starts. This value is omitted if there
is no data-flash area.
• End address of an area (4 bytes): Address where the area ends. This value is omitted if there is
no data-flash area.
The number of address pairs is the same as the number of areas.
• SUM (1 byte): Checksum value that makes the sum of the bytes from the command to the
SUM byte become H'00.
(l) Clock Switching Information Inquiry
In response to a clock switching information inquiry command, the boot program returns an
indicator of whether or not switching between an internal and external clock source is possible.
Command H'2C
• Command H'2C (1 byte): Clock switching information inquiry
Response H'3C Size Switching possibility SUM
• Response H'3C (1 byte): Response to a clock switching information inquiry command
• Size (1 byte): The number of characters in the switching possibility field (fixed to 1)
• Switching possibility (1 bytes): Possibility of switching between internal and external clock
sources
H'00: Switching is impossible.
H'01: Switching is possible.
• SUM (1 byte): Checksum value that makes the sum of the bytes from the command to the
SUM byte become H'00.