DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 646

• 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: -

Note that the reset signal should only be released after providing a reset input over a period longer
than the normal 100 μs. Since high voltages are applied during programming/erasing of the flash
memory, some voltage may still remain even after the error protection state has been entered. For
this reason, it is necessary to reduce the risk of damage to the flash memory by extending the reset
period so that the charge is released.
The state-transition diagram in figure 17.13 shows transitions to and from the error protection
state.
Rev. 5.00 Mar. 06, 2009 Page 626 of 770
REJ09B0243-0500
Error occurred
Programming/erasing
Programming/erasing disabled
Error protection mode
Program mode
Figure 17.13 Transitions to and from Error Protection State
Read disabled
Erase mode
FLER = 0
enabled
Read enabled
FLER = 1
Software standby mode
software standby mode
RES = 0
Cancel
Programming/erasing disabled
Error protection mode
(Software standby)
Programming/erasing interface
register is in its initial state.
RES = 0
Programming/erasing disabled
Read disabled
(Hardware protection)
FLER = 1
Reset or standby
Read enabled
FLER = 0
Programming/erasing interface
register is in its initial state.