DF2357F20 Renesas Electronics America, DF2357F20 Datasheet - Page 661

• 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: -

Bit 3—Flash Memory Control Register Enable (FLSHE): Controls CPU access to the flash memory control registers
(FLMCR1, FLMCR2, EBR1, and EBR2). Writing 1 to the FLSHE bit enables the flash memory control registers to be
read and written to. Clearing FLSHE to 0 designates these registers as unselected (the register contents are retained).
Bits 2 to 0—Reserved: These bits cannot be modified and are always read as 0.
19.16.6 RAM Emulation Register (RAMER)
RAMER specifies the area of flash memory to be overlapped with part of RAM when emulating real-time flash memory
programming. RAMER is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in software
standby mode. RAMER settings should be made in user mode or user program mode.
Flash memory area divisions are shown in table 19-34. To ensure correct operation of the emulation function, the ROM
for which RAM emulation is performed should not be accessed immediately after this register has been modified. Normal
execution of an access immediately after register modification is not guaranteed.
Bits 7 to 4—Reserved: These bits cannot be modified and are always read as 0.
Bit 3—RAM Select (RAMS): Specifies selection or non-selection of flash memory emulation in RAM. When RAMS =
1, all flash memory blocks are program/erase-protected.
Bit
Initial value :
R/W
Bit 3
RAMS
0
1
Bit 3
FLSHE
0
1
:
:
—
—
7
0
Description
Emulation not selected
Program/erase-protection of all flash memory blocks is disabled
Emulation selected
Program/erase-protection of all flash memory blocks is enabled
Description
Flash control registers are not selected for addresses H'FFFFC8 to H'FFFFCB
Flash control registers are selected for addresses H'FFFFC8 to H'FFFFCB
—
—
6
0
—
—
5
0
—
—
4
0
RAMS
R/W
3
0
RAM2
R/W
2
0
RAM1
R/W
Rev.6.00 Oct.28.2004 page 631 of 1016
1
0
RAM0
R/W
0
0
(Initial value)
(Initial value)
REJ09B0138-0600H