Datasheet

Section 22 Flash Memory
Rev. 3.00 Sep. 28, 2009 Page 744 of 910
REJ09B0350-0300
(6) 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 Response H'80 H'xx
• Error response, H'80, (one byte): Command error
• Command, H'xx, (one byte): Received command
(7) 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 division-ratio inquiry (H'22) or operating frequency inquiry (H'23), which
are needed for a new bit-rate selection.
6. A new bit rate should be selected with the new bit-rate selection (H'3F) command, according
to the returned information on division ratios and operating frequencies.
7. After selection of the device and clock mode, the information of the user boot MAT and the
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), and
programming unit inquiry (H'27).
8. After making inquiries and selecting a new bit rate, issue the transition to
programming/erasing state command (H'40). The boot program will then enter the
programming/erasing state.