R0K572011S000BE Renesas Electronics America, R0K572011S000BE Datasheet - Page 693

• Manufacturer Part Number: R0K572011S000BE
• Description: KIT STARTER FOR SH7201
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572011S000BE

• Contents: CPU Board, LCD Display Module, E8 Emulator, Cable, QuickStart Guide and CD-ROM
• For Use With/related Products: SH7201
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SH7201 Group
15.5
15.5.1
Do not write to the count registers (RSECCNT, RMINCNT, RHRCNT, RDAYCNT, RWKCNT,
RMONCNT, and RYRCNT) during the RTC counting (while the START bit in RCR2 is 1). If any
of the count registers is written to during the RTC counting, the count register may not be read
correctly immediately after the execution of a write instruction. The RTC counting must be
stopped before writing to any of the count registers.
15.5.2
The method of using the periodic interrupt function is shown in figure 15.5.
A periodic interrupt can be generated periodically at the interval set by the flags 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 or when the flags PES0 to PES2 are set.
Periodic interrupt generation can be confirmed by reading this bit, but normally the interrupt
function is used.
15.5.3
When a transition to standby mode is made after registers in the RTC are set, sometimes counting
is not performed correctly. In case the registers are set, be sure to make a transition to standby
mode after waiting for two count clocks or more.
R01UH0026EJ0300 Rev. 3.00
Sep 24, 2010
Usage Notes
Register Writing during RTC Count
Use of Realtime Clock (RTC) Periodic Interrupts
Transition to Standby Mode after Setting Register
Figure 15.5 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
Section 15 Realtime Clock (RTC)
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