HD6417727F100C Renesas Electronics America, HD6417727F100C Datasheet - Page 534

• Manufacturer Part Number: HD6417727F100C
• Description: IC SUPERH MPU ROMLESS 240QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417727F100C

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: FIFO, SCI, SIO, SmartCard, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 104
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 2.05 V
• Data Converters: A/D 6x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 240-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -

Section 16 Realtime Clock (RTC)
16.3.4
Figure 16.4 shows how to use the alarm function.
Alarm can be generated using seconds, minutes, hours, day of the week, date, month, or any
combination of these. Set the ENB bits (bit 7) in the desired alarm registers to 1, and then set the
alarm time in the lower bits. Clear the ENB bits in the registers which are not used for the alarm to
0.
When the clock and alarm time match, the AF bit (bit 0) in RCR1 is set to 1. The alarm detection
can be checked by reading this bit, but normally it is checked by the interrupt generation. If the
AIE bit (bit 3) in RCR1 is written with 1, an interrupt is generated when an alarm occurs.
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Alarm Function
(wait for interrupt or
Monitor alarm time
check alarm flag)
Clear alarm flag
Set alarm time
Clock running
Cancel alarm
interrupt
Figure 16.4 Using the Alarm Function
Always reset the alarm flag, since a flag may
have been set while the alarm time was being
set (clear the AF bit in RCR1 register to 0).
Disables interrupts (clears the AIE bit in
RCR1 to 0) in order to prevent erroneous
interrupts, and then writes 1.