Rev. 1.00, 09/03, page 553 of 704
Table 20.6 System Clock Frequency for Automatic-Bit-Rate Adjustment
Bit Rate of Host
System Clock Frequency which can Automatically Adjust Bit Rate of
this LSI
4,800 bps
5 to 20 MHz
9,600 bps
5 to 20 MHz
19,200 bps
5 to 20 MHz
(2) State Transition Diagram
The overview of the state transition diagram after boot mode is initiated is shown in figure 20.8.
1. Bit rate adjustment
After boot mode is initiated, the bit rate of the SCI interface is adjusted with that of the host.
2. Waiting for inquiry set command
For inquiries about the user-MAT size and configuration, MAT start address, and support state,
the required information is transmitted to the host.
3. Automatic erasure of all user MAT and user boot MAT
After inquiries have finished, all user MAT and user boot MAT are automatically erased.
4. Waiting for programming/erasing command
•
When the program preparation notice is received, the state for waiting program data is entered.
The programming start address and program data must be transmitted following the
programming command. When programming is finished, the programming start address must
be set to H'FFFFFFFF and transmitted. Then the state for waiting program data is returned to
the state for waiting programming/erasing command.
•
When the erasure preparation notice is received, the state for waiting erase-block data is
entered. The erase-block number must be transmitted following the erasing command. When
the erasure is finished, the erase-block number must be set to H'FF and transmitted. Then the
state for waiting erase-block data is returned to the state for waiting programming/erasing
command. The erasure must be used when the specified block is programmed without a reset
start after programming is executed in boot mode. When programming can be executed by
only one operation, all blocks are erased before the state for waiting
programming/erasing/other command is entered. Thus the erasing operation is not required.
•
There are many commands other than programming/erasing: sum check, blank check (erasure
check), and memory read of the user MAT/user boot MAT and acquisition of current status
information.
Note that memory read of the user MAT/user boot MAT is only applied to data programmed after
all user MAT/user boot MAT has been automatically erased.
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