HD6417727F160V Renesas Electronics America, HD6417727F160V Datasheet - Page 533

• Manufacturer Part Number: HD6417727F160V
• Description: MPU 3V 16K PB-FREE 240-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417727F160V

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 160MHz
• 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): 1.7 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: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

16.3.3
Figure 16.3 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. The method of reading the time without using
interrupts is shown at (a) in figure 16.3, and the method using carry interrupts is shown at (b). To
keep the program simple, method (a) is used normally.
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
Figure 16.3 Reading the Time
No
No
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
alarm flag is not cleared.
flag is not cleared.
Rev.6.00 Mar. 27, 2009 Page 475 of 1036
Section 16 Realtime Clock (RTC)
REJ09B0254-0600