DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 644

• 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: -

17.6
There are three kinds of flash memory program/erase protection: hardware, software, and error
protection.
17.6.1
Programming and erasing of flash memory is forcibly disabled or suspended by hardware
protection. In this state, the downloading of an on-chip program and initialization of the flash
memory are possible. However, an activated program for programming or erasure cannot program
or erase locations in a user MAT, and the error in programming/erasing is reported in the FPFR
parameter.
Table 17.8 Hardware Protection
Rev. 5.00 Mar. 06, 2009 Page 624 of 770
REJ09B0243-0500
Item
FWE-pin protection The input of a low-level signal on the FWE
Reset/standby
protection
Protection
Hardware Protection
Description
pin clears the FWE bit of FCCS and the LSI
enters a programming/erasing-protected
state.
•
•
A power-on reset (including a power-on
reset by the WDT) and entry to standby
mode initializes the programming/erasing
interface registers and the LSI enters a
programming/erasing-protected state.
Resetting by means of the RES pin after
power is initially supplied will not make
the LSI enter the reset state unless the
RES pin is held low until oscillation has
stabilized. In the case of a reset during
operation, hold the RES pin low for the
RES pulse width that is specified in the
section on AC characteristics. If the LSI is
reset during programming or erasure,
data in the flash memory is not
guaranteed. In this case, execute erasure
and then execute programming again.
Download
—
√
Function to be Protected
Programming/
Erasure
√
√