DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 633

• Manufacturer Part Number: DF71251AD50FPV
• Description: MCU RISC FLASH 32K 8K 64LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71251AD50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(2) State Transition Diagram
Note that the command for reading from the user MAT can only read data that has been
programmed after automatic erasure of the entire user MAT.
Figure 17.8 gives an overview of the state transitions after the chip has been started up in boot
mode. For details on boot mode, see section 17.8.1, Specifications of the Standard Serial
Communications Interface in Boot Mode.
1. Bit-rate matching
2. Waiting for inquiry and selection commands
3. Automatic erasure of the entire user MAT
4. Waiting for programming/erasure command
⎯ On receiving the programming selection command, the chip waits for data to be
⎯ On receiving the erasure select command, the chip waits for the block number of a block to
⎯ In addition to the programming and erasure commands, commands for sum checking and
After the chip has been started up in boot mode, bit-rate matching between the SCI and the
host proceeds.
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.
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 is automatically
erased.
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.
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.
blank checking (checking for erasure) of the user MAT, reading data from the user MAT,
and acquiring current state information are provided.
Rev. 5.00 Mar. 06, 2009 Page 613 of 770
REJ09B0243-0500