Bit 7—Periodic Interrupt Flag (PEF): Indicates interrupt generation at the interval specified by
bits PES2–PES0. When this flag is set to 1, a periodic interrupt is generated.
Bit 7: PEF
Description
0
Interrupt is not generated at interval specified by bits PES2–PES0
[Clearing condition]
When 0 is written to PEF
1
Interrupt is generated at interval specified by bits PES2–PES0
[Setting conditions]
•
•
Generation of interrupt at interval specified by bits PES2–PES0
When 1 is written to PEF
Bits 6 to 4—Periodic Interrupt Enable (PES2–PES0): These bits specify the period for periodic
interrupts.
Bit 6: PES2 Bit 5: PES1 Bit 4: PES0 Description
0
0
1
0
1
0
1
0
1
0
1
0
1
No periodic interrupt generation
(Initial value)
Periodic interrupt generated at 1/256-second intervals
Periodic interrupt generated at 1/64-second intervals
Periodic interrupt generated at 1/16-second intervals
Periodic interrupt generated at 1/4-second intervals
Periodic interrupt generated at 1/2-second intervals
Periodic interrupt generated at 1-second intervals
Periodic interrupt generated at 2-second intervals
1
Bit 3—Oscillator Enable (RTCEN): Controls the operation of the RTC’s crystal oscillator.
Bit 3: RTCEN
Description
0
1
RTC crystal oscillator is halted
RTC crystal oscillator is operated (Initial value)
Rev. 6.0, 07/02, page 282 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
