DF2556FC20DV Renesas Electronics America, DF2556FC20DV Datasheet - Page 777

• Manufacturer Part Number: DF2556FC20DV
• Description: IC H8S/2556 MCU FLASH 144QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2500r

Specifications of DF2556FC20DV

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 104
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

20.6
To provide real-time emulation in RAM of data that is to be written to the flash memory, a part of
the RAM can be overlapped on an area of flash memory (user MAT) that has been specified by
the RAM emulation register (RAMER). The RAM is accessible in both the user MAT area
specified by RAMER and as the RAM area that has been overlapped on the user MAT area. Such
emulation is possible in both user mode and user-program mode.
Figures 20.17 and 20.18 show an example of the emulation of real-time programming of the user
MAT area.
Flash Memory Emulation in RAM
Figure 20.17 Emulation of Flash Memory in RAM
No
Execute application program
Start of emulation program
End of emulation program
Write the data for tuning to
the overlapped RAM area
Program the user MAT
with the emulated block
Cancel RAMER setting
Tuning OK?
Set RAMER
Yes
Rev. 6.00 Sep. 24, 2009 Page 729 of 928
Section 20 Flash Memory
REJ09B0099-0600