R5F2121AJFP#U0 Renesas Electronics America, R5F2121AJFP#U0 Datasheet - Page 395

• Manufacturer Part Number: R5F2121AJFP#U0
• Description: MCU FLASH 96K 5K CMOS 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/21r

Specifications of R5F2121AJFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/20 Group, R8C/21 Group
Rev.2.00 Aug 27, 2008
REJ09B0250-0200
19.2
The flash memory contains a user ROM area and a boot ROM area (reserved area).
Figure 19.1 shows the Flash Memory Block Diagram for R8C/20 Group. Figure 19.2 shows the Flash Memory
Block Diagram for R8C/21 Group.
The user ROM area of R8C/21 Group contains an area which stores a MCU operating program (program ROM)
and the 1-Kbyte block A and B (data flash).
The user ROM area is divided into several blocks. The user ROM area can be rewritten in CPU rewrite and
standard serial I/O and parallel I/O modes.
When rewriting the block 0 and block 1 in CPU rewrite mode, set the FMR02 bit in the FMR0 register to 1 (rewrite
enables), and when setting the FMR15 bit in the FMR1 register to 0 (rewrite enables), block 0 is rewritable. When
setting the FMR16 bit to 0 (rewrite enables), block 1 is rewritable.
When rewriting the block 2 and block 3 in CPU rewrite mode, set the FMR02 bit in the FMR0 register to 1 (rewrite
enables).
The rewrite control program for standard serial I/O mode is stored in boot ROM area before shipment. The boot
ROM area and the user ROM area share the same address, but have an another memory.
Memory Map
Page 377 of 458
19. Flash Memory