R8A77800ANBGAV Renesas Electronics America, R8A77800ANBGAV Datasheet - Page 780

• Manufacturer Part Number: R8A77800ANBGAV
• Description: IC SUPERH MPU ROMLESS 449-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77800ANBGAV

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 400MHz
• Connectivity: Audio Codec, MMC, Serial Sound, SCI, SIO, SPI, SSI
• Peripherals: DMA, POR, WDT
• Number Of I /o: 75
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.35 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 449-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 20 Realtime Clock (RTC)
20.4.2
Figure 20.3 shows examples of the time reading procedures.
Rev.1.00 Dec. 13, 2005 Page 728 of 1286
REJ09B0158-0100
Time Reading Procedures
Add 1 (second) to the second
counter register value that is
read out*
Add 1 (second) to the second
counter register value that is
read out*
Note: * When H'59 is read out from the second counter register, that
should be changed to H'00 and the read out value of the minute
counter register should be added to 1 as a carry processing.
The hour counter, day-of-week, day, month, and year counters
may be necessary to do carry processing.
Figure 20.3 Examples of Time Reading Procedures
Yes
Yes
Yes
Yes
(a) Reading time without using interrupts
(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
CRF = 1?
CRF = 1?
CF = 1?
No
No
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.