SH7727 Datasheet, PDF (543/1109 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Section 16 Realtime Clock (RTC)
Bit 7—Periodic Interrupt Flag (PEF): Indicates that interrupts are generated with the period
designated by the PES bits. When this bit is set to 1, periodic interrupts are generated.
Bit 7: PEF
0
1
Description
Interrupts not generated with the period designated by the PES bits.
Clearing condition: When 0 is written to PEF
(Initial value)
Setting condition:
When interrupts are generated with the period designated by the PES bits
When 1 is written to PEF
Bits 6 to 4—Periodic Interrupt Flags (PES2 to PES0): These bits specify the periodic interrupt.
Bit 6: PES2
0
1
Bit 5: PES1
0
1
0
1
Bit 4: PES0
0
1
0
1
0
1
0
1
Description
No periodic interrupts generated
(Initial value)
Periodic interrupt generated every 1/256 second
Periodic interrupt generated every 1/64 second
Periodic interrupt generated every 1/16 second
Periodic interrupt generated every 1/4 second
Periodic interrupt generated every 1/2 second
Periodic interrupt generated every 1 second
Periodic interrupt generated every 2 seconds
Bit 3—RTCEN: Controls the operation of the crystal oscillator for the RTC.
Bit 3: RTCEN
Description
0
Halts the crystal oscillator for the RTC. *
1
Runs the crystal oscillator for the RTC. *
Note: * RTCEN should be set to 0 when the RTC is not used.
(Initial value)
Rev. 5.00 Dec 12, 2005 page 471 of 1034
REJ09B0254-0500