DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 614

• Manufacturer Part Number: DF71251AD50FPV
• Description: MCU RISC FLASH 32K 8K 64LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71251AD50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(4) Flash Key Code Register (FKEY)
Rev. 5.00 Mar. 06, 2009 Page 594 of 770
REJ09B0243-0500
Bit
0
Bit
7 to 0
FKEY is a register for software protection that enables download of the on-chip program and
programming/erasing of flash memory. Before setting the SCO bit to 1 in order to download
the on-chip program or executing the downloaded programming/erasing program, these
processings cannot be executed if the key code is not written.
Bit Name
EPVB
Bit Name
K[7:0]
Initial
Value
0
Initial value:
Initial
Value
All 0
R/W:
Bit:
R/W
7
0
R/W
R/W
R/W
R/W
R/W
6
0
Description
Erase Pulse Verify Block
Selects the erasing program.
0: On-chip erasing program is not selected
[Clearing condition]
When transfer is completed
1: On-chip erasing program is selected
Description
Key Code
Only when H'A5 is written, writing to the SCO bit is
valid. When a value other than H'A5 is written to FKEY,
1 cannot be written to the SCO bit. Therefore
downloading to the on-chip RAM cannot be executed.
Only when H'5A is written, programming/erasing of
flash memory can be executed. Even if the on-chip
programming/erasing program is executed, flash
memory cannot be programmed or erased when a
value other than H'5A is written to FKEY.
H'A5: Writing to the SCO bit is enabled (The SCO bit
H'5A: Programming/erasing is enabled (A value other
H'00: Initial value
R/W
5
0
cannot be set by a value other than H'A5.)
than H'5A enables software protection state.)
R/W
4
0
K[7:0]
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0