DF2357F20 Renesas Electronics America, DF2357F20 Datasheet - Page 631

• Manufacturer Part Number: DF2357F20
• Description: IC H8S MCU FLASH 5V 128K 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2357F20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

19.11
19.11.1 Emulation in RAM
Making a setting in the RAM emulation register (RAMER) enables part of RAM to be overlapped onto the flash memory
area so that data to be written to flash memory can be emulated in RAM in real time. After the RAMER setting has been
made, accesses can be made from the flash memory area or the RAM area overlapping flash memory. Emulation can be
performed in user mode and user program mode. Figure 19-22 shows an example of emulation of real-time flash memory
programming.
Flash Memory Emulation in RAM
Figure 19-22 Flowchart for Flash Memory Emulation in RAM
No
Write to flash memory emulation
Execute application program
Write tuning data to overlap
End of emulation program
Start emulation program
Clear RAMER
Set RAMER
Tuning OK?
RAM
block
Yes
Rev.6.00 Oct.28.2004 page 601 of 1016
REJ09B0138-0600H