M306N4FGTFP Renesas Electronics America, M306N4FGTFP Datasheet - Page 291

• Manufacturer Part Number: M306N4FGTFP
• Description: IC M16C MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/6Nr

Specifications of M306N4FGTFP

• Core Processor: M16C/60
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, I²C, IEBus, SIO, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 10K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 26x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

M16C/6N Group (M16C/6N4)
Rev.2.40
REJ09B0009-0240
Figure 21.10 Lock Bit Program Command
21.3.5.6 Erase All Unlocked Block
21.3.5.7 Lock Bit Program Command
The erase all unlocked block command erases all blocks except the block A.
By writing xxA7h in the first bus cycle and xxD0h in the second bus cycle, an auto-erase (erase and
verify) operation will run continuously in all blocks except the block A.
The FMR00 bit in the FMR0 register indicates whether an auto-erase operation has been completed.
After the completion of an auto-erase operation, the FMR07 bit in the FMR0 register indicates whether
or not the auto-erase operation has been completed as expected.
The lock bit can protect each block from being programmed inadvertently. (Refer to 21.3.6 Data Protect
Function.)
In EW1 mode, do not execute this command when the lock bit for any block storing the rewrite control
program is set to 1 (unlocked) or when the FMR02 bit in the FMR0 register is set to 1 (lock bit disabled).
In EW0 mode, the MCU enters read status register mode as soon as an auto-erase operation starts. The
status register can be read. The SR7 bit in the status register is set to 0 (busy) at the same time an
auto-erase operation starts. It is set to 1 (ready) when an auto-erase operation is completed. The MCU
remains in read status register mode until the read array command or read lock bit status command is
written.
Only blocks 0 to 8 can be erased by the erase all unlocked block command. The block A cannot be
erased. Use the block erase command to erase the block A.
The lock bit program command sets the lock bit for a specified block to 0 (locked).
By writing xx77h in the first bus cycle and xxD0h to the highest-order even address of a block in the second
bus cycle, the lock bit for the specified block is set to 0. The address value specified in the first bus cycle
must be the same highest-order even address of a block specified in the second bus cycle.
Figure 21.10 shows a flow chart of the Lock Bit Program Command. Execute read lock bit status
command to read lock bit state (lock bit data).
The FMR00 bit in the FMR0 register indicates whether a lock bit program operation is completed.
Refer to 21.3.6 Data Protect Function for details on lock bit functions and how to set it to 1 (unlocked).
Apr 14, 2006
page 267 of 376
NOTE:
1.Write the command code and data to even addresses.
Write xxD0h to the highest-order
block address
Write command code xx77h to
the highest-order block address
Lock bit program operation
is completed
Full status check
FMR00=1?
Start
YES
NO
21. Flash Memory Version