DF2345TE20 Renesas Electronics America, DF2345TE20 Datasheet - Page 615

• Manufacturer Part Number: DF2345TE20
• Description: MCU 5V 128K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2345TE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 71
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K 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: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2345TE20; HD64F2345TE20

(program rewrite) using the boot mode. Note that there may still be cases in which boot mode
cannot be started normally due to excessive programming or erasing of the flash memory.
17.11
17.11.1 Emulation in RAM
Since programming or erasing the flash memory takes time, it may be difficult to perform tuning
by overwriting parameters and other data in real time. In such cases, 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 17.24 shows an example of emulation of real-time flash memory programming.
Flash Memory Emulation in RAM
Figure 17.24 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. 4.00 Feb 15, 2006 page 589 of 900
REJ09B0291-0400
Section 17 ROM