HD6417708SF60V Renesas Electronics America, HD6417708SF60V Datasheet - Page 355

• Manufacturer Part Number: HD6417708SF60V
• Description: IC SUPERH MPU ROMLESS 208LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417708SF60V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 60MHz
• Connectivity: EBI/EMI, SCI, SmartCard
• Peripherals: POR, WDT
• Number Of I /o: 8
• Program Memory Type: ROMless
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 208-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Ram Size: -
• Program Memory Size: -
• Data Converters: -

12.3.3
Figure 12.3 shows how to read the time. If a carry occurs while reading the time, the correct time
will not be obtained, so it must be read again. Part (a) in figure 12.3 shows the method of reading
the time without using interrupts; part (b) in figure 12.3 shows the method using carry interrupts.
To keep programming simple, method (a) should normally be used.
Reading the Time
Yes
Yes
b. To use interrupts
a.
Clear the carry flag
Clear the carry flag
Disable the carry
To read the time
without using interrupts
Disable the carry
Enable the carry
Carry flag = 1?
Read counter
Read counter
generated?
Interrupt
interrupt
interrupt
register
register
interrupt
No
No
Figure 12.3 Reading the Time
Write 0 to CIE in RCR1
Write 0 to CF in RCR1
Note: Set AF to 1 so that alarm
Read RCR1 and check CF
Write 1 to CIE in RCR1,
and write 0 to CF in RCR1
Note: Set AF in RCR1 to 1 so that
Write 0 to CIE in RCR1
flag is not cleared.
alarm flag is not cleared.
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