R5S77631Y266BGV Renesas Electronics America, R5S77631Y266BGV Datasheet - Page 851

• Manufacturer Part Number: R5S77631Y266BGV
• Description: IC SUPERH MPU ROMLESS 499BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R5S77631Y266BGV

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 266MHz
• Connectivity: Audio Codec, I²C, MMC, SCI, SIM, SIO, SSI, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 107
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.35 V
• Data Converters: A/D 4x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 499-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

22.5.2
Figure 22.3 shows examples of the time reading procedures.
If a carry occurs while the time is being read, the correct time will not be obtained and the read
must be repeated. The procedure for reading the time without using interrupts is shown in figure
22.3 (a), and the procedure using carry interrupts in figure 22.3 (b). The method without using
interrupts is normally used to keep the program simple.
Time Reading Procedures
Yes
Yes
(a) Reading time without using interrupts
Figure 22.3 Examples of Time Reading Procedures
(b) Reading time using interrupts
Disable carry interrupts
Disable carry interrupts
Enable carry interrupts
Read counter register
Read counter register
Interrupt generated?
Clear carry flag
Clear carry flag
Clear carry flag
Carry flag = 1?
No
No
Clear RCR1.CIE to 0.
Clear RCR1.CF to 0
(Write 1 to RCR1.AF so that alarm flag
is not cleared).
Read RCR1 register and check CF bit.
Set RCR1.CIE to 1.
Clear RCR1.CF to 0
(Write 1 to RCR1.AF so that alarm flag
is not cleared).
Clear RCR1.CIE to 0.
Rev. 2.00 May 22, 2009 Page 781 of 1982
Section 22 Realtime Clock (RTC)
REJ09B0256-0200