HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 411

• 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: -

11.3.2
Figure 11.3 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
Time Reading Procedures
Yes
Yes
Disable carry interrupts
Disable carry interrupts
Enable carry interrupts
Read counter register
Read counter register
Figure 11.3 Examples of Time Reading Procedures
Interrupt generated?
Clear carry flag
Clear carry flag
Clear carry flag
Carry flag = 1?
(a) Reading time without using interrupts
(b) Reading time using interrupts
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.4.00 Oct. 10, 2008 Page 311 of 1122
11. Realtime Clock (RTC)
REJ09B0370-0400