HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 409

• Manufacturer Part Number: HD6417751RF240V
• Description: MPU 1.5/3.3V 0K PB-FREE 256-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417751RF240V

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-QFP Exposed Pad, 256-eQFP, 256-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

11.3
Examples of the use of the RTC are shown below.
11.3.1
Figure 11.2 shows examples of the time setting procedures.
The procedure for setting the time after stopping the clock is shown in figure 11.2 (a). The
programming for this method is simple, and it is useful for setting all the counters, from second to
year.
Yes
Operation
Time Setting Procedures
Set second/minute/hour/day/
day-of-week/month/year
Write to counter register
Reset frequency divider
Start clock operation
Figure 11.2 Examples of Time Setting Procedures
Clear carry flag
Carry flag = 1?
Stop clock
(b) Setting time while clock is running
(a) Setting time after stopping clock
No
Set RCR2.RESET to 1
Clear RCR2.START to 0
In any order
Set RCR2.START to 1
Clear RCR1.CF to 0
(Write 1 to RCR1.AF so that alarm flag
is not cleared)
Set RYRCNT first and RSECCNT last
Read RCR1 register and check CF bit
Rev.4.00 Oct. 10, 2008 Page 309 of 1122
11. Realtime Clock (RTC)
REJ09B0370-0400