DS72030W200FPV Renesas Electronics America, DS72030W200FPV Datasheet - Page 748

• Manufacturer Part Number: DS72030W200FPV
• Description: MPU, 32BIT, SH7203, ROMLESS, 240QFP
• Manufacturer: Renesas Electronics America
• Series: SH7200r

Specifications of DS72030W200FPV

• Core Size: 32bit
• Program Memory Size: 32KB
• Cpu Speed: 200MHz
• Digital Ic Case Style: QFP
• No. Of Pins: 240
• Supply Voltage Range: 1.1V To 1.3V
• Operating Temperature Range: -20°C To +85°C
• Svhc: No SVHC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Section 14 Realtime Clock (RTC)
14.4.3
Figure 14.3 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 14.3 shows the method of reading the time without using interrupts; part
(b) in figure 14.3 shows the method using carry interrupts. To keep programming simple, method
(a) should normally be used.
Rev. 3.00 Sep. 28, 2009 Page 716 of 1650
REJ09B0313-0300
Reading Time
Yes
Yes
(a) To read the time without using interrupts
(b) To read the time using interrupts
Disable the carry interrupt
Disable the carry interrupt
Enable the carry interrupt
Read counter register
Read counter register
Clear the carry flag
Clear the carry flag
Clear the carry flag
Carry flag = 1?
interrupt
Figure 14.3 Reading Time
No
No
Write 0 to CIE in RCR1
Write 0 to CF in RCR1
(Set AF in RCR1 to 1 so that alarm
Read RCR1 and check CF bit
Write 0 to CF in RCR1
(Set AF in RCR1 to 1 so that alarm
Write 0 to CIE in RCR1
Write 1 to CIE in RCR1
flag is not cleared.)
flag is not cleared.)