D12320VF25V Datasheet, PDF (756/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
Table 17.53 System Clock Frequency that can Automatically Adjust Bit Rate of This LSI
Bit rate of host
19,200 bps
9,600 bps
System Clock Frequency Which Can Automatically Adjust Bit Rate of
This LSI
16 MHz to 25 MHz
8 MHz to 25 MHz
State Transition: The overview of the state transition after boot mode is initiated is shown in
figure 17.67. For details on boot mode, refer to section 17.29.1, Serial Communications Interface
Specification for Boot Mode.
[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 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 of programming/erasing command wait.
• 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 executed when reset start is not executed and the specified
block is programmed 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. The erasing operation is not required.
• There are many commands other than programming/erasing. Examples are sum check, blank
check (erasure check), and memory read of the user MAT/user boot MAT and acquisition of
current status information.
Rev.7.00 Feb. 14, 2007 page 722 of 1108
REJ09B0089-0700