DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 697

• 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: -

19.5.2
Software standby mode is canceled by interrupts (NMI, IRQ) or a reset.
(1)
The WDT can be used for hot starts. When an NMI or IRQ interrupt (edge detection) is detected,
the clock will be supplied to the entire LSI and software standby mode will be canceled after the
time set in the timer control/status register of the WDT has elapsed. Interrupt exception handling
is then executed.
When the priority level of an IRQ interrupt is lower than the interrupt mask level set in the status
register (SR) of the CPU, an interrupt request is not accepted preventing software standby mode
from being canceled.
When falling-edge detection is selected for the NMI pin, drive the NMI pin high before making a
transition to software standby mode. When rising-edge detection is selected for the NMI pin, drive
the NMI pin low before making a transition to software standby mode.
Similarly, when falling-edge detection is selected for the IRQ pin, drive the IRQ pin high before
making a transition to software standby mode. When rising-edge detection is selected for the IRQ
pin, drive the IRQ pin low before making a transition to software standby mode.
(2)
Software standby mode is canceled by a power-on reset with the RES pin. Keep the RES pin low
until the clock oscillation settles.
(3)
Note that software standby mode cannot be canceled with a manual reset in this LSI.
Canceling with Interrupt
Canceling with Power-on Reset
Canceling with Manual Reset
Canceling Software Standby Mode
Rev. 5.00 Mar. 06, 2009 Page 677 of 770
REJ09B0243-0500