DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 696

• 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
19.5.1
This LSI switches from a program execution state to software standby mode by executing the
SLEEP instruction when the STBY bit in STBCR1 and the STBYMD bit in STBCR6 are set to 1.
In software standby mode, not only the CPU but also the clock and on-chip peripheral modules
halt.
The contents of the CPU registers and the data of the on-chip RAM remain unchanged. Some
registers of on-chip peripheral modules are, however, initialized. For details on the states of on-
chip peripheral module registers in software standby mode, refer to section 20.3, Register States in
Each Operating Mode. For details on the pin states in software standby mode, refer to appendix A,
Pin States.
The procedure for switching to software standby mode is as follows:
1. Clear the TME bit in the timer control register (WTCSR) of the WDT to 0 to stop the WDT.
2. Set the timer counter (WTCNT) of the WDT to 0 and bits CKS2 to CKS0 in WTCSR to
3. After setting the STBY bit in STBCR1 and the STBYMD bit in STBCR6 to 1, execute the
4. Software standby mode is entered and the clocks within this LSI are halted.
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REJ09B0243-0500
appropriate values to secure the specified oscillation settling time.
SLEEP instruction.
Software Standby Mode
Transition to Software Standby Mode