D12320VF25V Datasheet, PDF (803/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
Command Error
A command error will occur when a command is undefined, the order of commands is incorrect,
or a command is unacceptable. Issuing a clock-mode selection command before a device selection
or an inquiry command after the transition to programming/erasing state command, are examples.
Error
H'80 H'xx
Response
• Error response, H'80, (1 byte): Command error
• Command, H'xx, (1 byte): Received command
Command Order
The order for commands in the inquiry selection state is shown below.
(1) A supported device inquiry (H'20) should be made to inquire about the supported devices.
(2) The device should be selected from among those described by the returned information and set
with a device-selection (H'10) command.
(3) A clock-mode inquiry (H'21) should be made to inquire about the supported clock modes.
(4) The clock mode should be selected from among those described by the returned information
and set.
(5) After selection of the device and clock mode, inquiries for other required information should
be made, such as the multiplication-ratio inquiry (H'22) or operating frequency inquiry (H'23).
(6) A new bit rate should be selected with the new bit-rate selection (H'3F) command, according to
the returned information on multiplication ratios and operating frequencies.
(7) After selection of the device and clock mode, the information of the user boot MAT and user
MAT should be made to inquire about the user boot MATs information inquiry (H'24), user
MATs information inquiry (H'25), erased block information inquiry (H'26), programming unit
inquiry (H'27).
(8) After making inquiries and selecting a new bit rate, issue the transition to programming/erasing
state (H'40) command. The boot program will then enter the programming/erasing state.
Programming/Erasing State
A programming selection command makes the boot program select the programming method, an
n-byte programming command makes it program the memory with data, and an erasing selection
command and block erasing command make it erase the block. The programming/erasing
commands are listed below.
Rev.7.00 Feb. 14, 2007 page 769 of 1108
REJ09B0089-0700