HD6417708RF100A Renesas Electronics America, HD6417708RF100A Datasheet - Page 273

• Manufacturer Part Number: HD6417708RF100A
• Description: IC SUPERH MPU ROMLESS 144LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417708RF100A

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: EBI/EMI, SCI, SmartCard
• Peripherals: POR, WDT
• Number Of I /o: 8
• Program Memory Type: ROMless
• Voltage - Supply (vcc/vdd): 3.15 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Ram Size: -
• Program Memory Size: -
• Data Converters: -

1. Normally, set the refresh counter count value to the optimum value for the L version (e.g. 1024
2. When a transition is made to self-refreshing:
This procedure causes refreshing immediately following a self-refresh to occur in a short cycle.
When adequate refreshing ends, an interrupt is generated and the setting can be restored to the
original refresh cycle.
CAS-before-RAS refreshing is performed in normal operation, in sleep mode, and in a manual
reset.
Self-refreshing is performed in normal operation, in sleep mode, in standby mode, and in a manual
reset.
When the bus has been released in response to a bus arbitration request, or when a transition is
made to standby mode, signals generally become high-impedance. Controlling the RAS and CAS
signals to become high-impedance or continue to be output is performed with the HIZCNT bit in
BCR1. This enables the DRAM to be kept in the self-refreshing state.
cycles/128 ms).
a. Provide an interrupt handler to restore the refresh counter count value to the optimum value
b. Reset the refresh counter count value to the requested short cycle (e.g. 1024 cycles/16 ms),
c. Set self-refresh mode.
for the L version (e.g. 1024 cycles/128 ms) when a refresh counter overflow interrupt is
generated.
set refresh controller overflow interruption, and clear the refresh count register (RFCR) to
0.
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