M306N4FGTFP Renesas Electronics America, M306N4FGTFP Datasheet - Page 277

• 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
21.2 Functions to Prevent Flash Memory from Rewriting
The flash memory has the ROM code protect function for parallel I/O mode and the ID code check function
for standard serial I/O mode and CAN I/O mode to prevent the flash memory from reading or rewriting.
21.2.1 ROM Code Protect Function
21.2.2 ID Code Check Function
The ROM code protect function inhibits the flash memory from being read or rewritten during parallel I/O
mode. Figure 21.2 shows the ROMCP Register. The ROMCP register is located in the user ROM area.
The ROM code protect function is enabled when the ROMCR bits are set to other than 11b. In this case,
set the bit 5 to bit 0 to 111111b.
When exiting ROM code protect, erase the block including the ROMCP register by CPU rewrite mode,
standard serial I/O mode, or CAN I/O mode.
Use the ID code check function in standard serial I/O mode and CAN I/O mode. The ID code sent from the
serial programmer is compared with the ID code written in the flash memory for a match. If the ID codes
do not match, commands sent from the serial programmer are not accepted. However, if the four bytes of
the reset vector are FFFFFFFFh, ID codes are not compared, allowing all commands to be accepted.
The ID codes are 7-byte data stored consecutively, starting with the first byte, into addresses 0FFFDFh,
0FFFE3h, 0FFFEBh, 0FFFEFh, 0FFFF3h, 0FFFF7h, and 0FFFFBh. The flash memory must have a
program with the ID codes set in these addresses.
Figure 21.3 shows the Addresses for ID Code Stored.
Apr 14, 2006
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21. Flash Memory Version