R5F72115D160FPV datasheet(946/1228 Pages) RENESAS

946 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 922 of 1200

REJ09B0344-0200

(2)

State Transition Diagram

Figure 21.8 gives an overview of the state transitions after the chip has been started up in boot

mode. For details on boot mode, see section 21.8.1, Specifications of the Standard Serial

Communications Interface in Boot Mode.

1. Bit-rate matching

After the chip has been started up in boot mode, bit-rate matching between the SCI and the

host proceeds.

2. Waiting for inquiry and selection commands

The chip sends the requested information to the host in response to inquiries regarding the size

and configuration of the user MAT, start addresses of the MATs, information on supported

devices, etc.

3. Automatic erasure of the entire user MAT and user boot MAT

After all necessary inquiries and selections have been made and the command for transition to

the programming/erasure state is sent by the host, the entire user MAT and user boot MAT are

automatically erased.

4. Waiting for programming/erasure command

⎯ On receiving the programming selection command, the chip waits for data to be

programmed. To program data, the host transmits the programming command code

followed by the address where programming should start and the data to be programmed.

This is repeated as required while the chip is in the programming-selected state. To

terminate programming, H'FFFFFFFF should be transmitted as the first address of the area

for programming. This makes the chip return to the programming/erasure command

waiting state from the programming data waiting state.

⎯ On receiving the erasure select command, the chip waits for the block number of a block to

be erased. To erase a block, the host transmits the erasure command code followed by the

number of the block to be erased. This is repeated as required while the chip is in the

erasure-selected state. To terminate erasure, H'FF should be transmitted as the block

number. This makes the chip return to the programming/erasure command waiting state

from the erasure block number waiting state. Erasure should only be executed when a

specific block is to be reprogrammed without executing a reset-start of the chip after the

flash memory has been programmed in boot mode. If all desired programming is done in a

single operation, such erasure processing is not necessary because all blocks are erased

before the chip enters the programming/erasure/other command waiting state.

⎯ In addition to the programming and erasure commands, commands for sum checking and

blank checking (checking for erasure) of the user MAT and user boot MAT, reading data

from the user MAT/user boot MAT, and acquiring current state information are provided.

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