HD6473937RXV Renesas Electronics America, HD6473937RXV Datasheet - Page 108

• Manufacturer Part Number: HD6473937RXV
• Description: MCU 3/5V 60K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300L SLPr

Specifications of HD6473937RXV

• Core Processor: H8/300L
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: SCI
• Peripherals: POR, WDT
• Number Of I /o: 59
• Program Memory Size: 60KB (60K x 8)
• Program Memory Type: OTP
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Therefore, when a transition is made from standby mode, watch mode, or subactive mode, to
active (high-speed/medium-speed) mode, with an oscillator element connected to the system clock
oscillator, careful evaluation must be carried out on the installation circuit before deciding on the
oscillation settling standby time. In particular, since the oscillation settling time is affected by
installation circuit constants, stray capacitance, and so forth, suitable constants should be
determined in consultation with the oscillator element manufacturer.
4.5.2
When a microcomputer operates, the internal power supply potential fluctuates slightly in
synchronization with the system clock. Depending on the individual crystal oscillator element
characteristics, the oscillation waveform amplitude may not be sufficiently large immediately after
the oscillation settling standby time, making the oscillation waveform susceptible to influence by
fluctuations in the power supply potential. In this state, the oscillation waveform may be
disrupted, leading to an unstable system clock and erroneous operation of the microcomputer.
If erroneous operation occurs, change the setting of standby timer select bits 2 to 0 (STS2 to
STS0) (bits 6 to 4 in system control register 1 (SYSCR1)) to give a longer standby time.
For example, if erroneous operation occurs with a standby time setting of 16 states, check the
operation with a standby time setting of 1,024 states or more.
If the same kind of erroneous operation occurs after a reset as after a state transition, hold the RES
pin low for a longer period.
94
Notes on Use of Crystal Oscillator Element (Excluding Ceramic Oscillator
Element)