R0K572030S000BE Renesas Electronics America, R0K572030S000BE Datasheet - Page 750

Manufacturer Part Number

R0K572030S000BE

KIT DEV FOR SH7203

Manufacturer

Renesas Electronics America

Renesas Starter Kits (RSK)r

CPU Board, LCD Module, E10A-Lite Emulator, Cable, QuickStart Guide and CD-ROM

Silicon Manufacturer

Kit Contents

Silicon Family Name

Silicon Core Number

R5S72030W200FP

Tool / Board Applications

General Purpose MCU, MPU, DSP, DSC

Mcu Supported Families

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

For Use With/related Products

Lead Free Status / Rohs Status

Section 14 Realtime Clock (RTC)

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 stopped before writing to any of the above registers.

The method of using the periodic interrupt function is shown in figure 14.5.

A periodic interrupt can be generated periodically at the interval set by bits PES2 to PES0 in

RCR2. When the time set by bits PES2 to PES0 has elapsed, the PEF is set to 1.

The PEF is cleared to 0 upon periodic interrupt generation or when bits PES2 to PES0 are set.

Periodic interrupt generation can be confirmed by reading this bit, but normally the interrupt

function is used.

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 performing one dummy read the register.

Rev. 3.00 Sep. 28, 2009 Page 718 of 1650

REJ09B0313-0300

Use of Real-time Clock (RTC) Periodic Interrupts

Transition to Standby Mode after Setting Register

Figure 14.5 Using Periodic Interrupt Function

Elapse of time set by PES

Set PES, clear PEF

Set PES2 to PES0

and clear PEF to 0

Clear PEF to 0