Renesas SH7709S 用户手册
Rev. 5.00, 09/03, page 421 of 760
Bits 6 to 4—Periodic Interrupt Flags (PES2-PES0): Specify the periodic interrupt.
Bit 6: PES2
Bit 5: PES1
Bit 4: PES0
Description
0
0
0
No periodic interrupts generated (Initial value)
1
Periodic interrupt generated every 1/256 second
1
0
Periodic interrupt generated every 1/64 second
1
Periodic interrupt generated every 1/16 second
1
0
0
Periodic interrupt generated every 1/4 second
1
Periodic interrupt generated every 1/2 second
1
0
Periodic interrupt generated every 1 second
1
Periodic interrupt generated every 2 seconds
Bit 3
—
RTCEN: Controls the operation of the crystal oscillator for the RTC.
Bit 3: RTCEN
Description
0
Crystal oscillator for RTC is halted
1
Crystal oscillator for RTC runs
(Initial value)
Bit 2
—
30
Second Adjustment (ADJ): When 1 is written to the ADJ bit, times of 29 seconds or
less will be rounded to 00 seconds and 30 seconds or more to 1 minute. The divider circuit, RTC
prescaler, and R64CNT will be simultaneously reset. This bit is always read as 0. The maximum
duration between when the ADJ bit is set to 1 and when the new setting is reflected in the readout
value from the seconds counter (RSECCNT) is approximately 91.6 µs (when a 32.768 kHz quartz
oscillator is connected to the EXTAL2 pin).
prescaler, and R64CNT will be simultaneously reset. This bit is always read as 0. The maximum
duration between when the ADJ bit is set to 1 and when the new setting is reflected in the readout
value from the seconds counter (RSECCNT) is approximately 91.6 µs (when a 32.768 kHz quartz
oscillator is connected to the EXTAL2 pin).
Bit 2: ADJ
Description
0
Runs normally
(Initial value)
1 (Write)
30-second adjustment
Bit 1
—
Reset (RESET): When 1 is written, initializes the divider circuit (RTC prescaler and
R64CNT). This bit is always read as 0.
Bit 1: RESET
Description
0
Runs normally
(Initial value)
1 (Write)
Divider circuit is reset