HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 391

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

13.5
13.5.1
The following RTC registers cannot be written to during an RTC count (while bit 0 = 1 in RCR2).
RSECCNT, RMINCNT, RHRCNT, RDAYCNT, RWKCNT, RMONCNT, RYRCNT
The RTC count must be halted before writing to any of the above registers.
13.5.2
The method of using the periodic interrupt function is shown in figure 13.6.
A periodic interrupt can be generated periodically at the interval set by the periodic interrupt
enable flag (PES0 to PES2) in RCR2. When the time set by the PES0 to PES2 has elapsed, the
PEF is set to 1.
The PEF is cleared to 0 upon periodic interrupt generation when the periodic interrupt enable flag
(PES0 to PES2) is set. Periodic interrupt generation can be confirmed by reading this bit, but
normally the interrupt function is used.
Usage Note
Use of Realtime Clock (RTC) Periodic Interrupts
Register Writing during RTC Count
Figure 13.6 Using Periodic Interrupt Function
Elapse of time set by PES
Set PES, clear PEF
Clear PEF
Set PES0 to PES2,
and clear PEF to 0,
in RCR2
Clear PEF to 0
Rev. 4.00, 03/04, page 345 of 660