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R01UH0823EJ0100 Rev.1.00 Page 187 of 1823

Jul 31, 2019

RX23W Group 9. Clock Generation Circuit

9.2.14 Oscillation Stop Detection Control Register (OSTDCR)

Note: Set the PRCR.PRC0 bit to 1 (write enabled) before rewriting this register.

OSTDIE Bit (Oscillation Stop Detection Interrupt Enable)

If the oscillation stop detection flag in the oscillation stop detection status register (OSTDSR.OSTDF) requires clearing,

do this after setting the OSTDIE bit to 0. Wait for at least two cycles of PCLKB before again setting the OSTDIE bit to 1.

According to the number of cycles for access to read a given I/O register, wait time longer than two cycles of PCLKB

may have to be secured.

OSTDE Bit (Oscillation Stop Detection Function Enable)

This bit enables or disables the oscillation stop detection function.

When the OSTDE bit is 1 (oscillation stop detection function enabled), the LOCO stop bit (LOCOCR.LCSTP) is set to 0

and the LOCO operation is started. The LOCO cannot be stopped while the oscillation stop detection function is enabled;

writing 1 (LOCO is stopped) to the LOCOCR.LCSTP bit is invalid.

When the oscillation stop detection flag in the oscillation stop detection status register (OSTDSR.OSTDF) is 1 (main

clock oscillation stop has been detected), writing 0 to the OSTDE bit is invalid.

When the OSTDE bit is 1, a transition cannot be made to software standby mode. To make a transition to software

standby mode, execute the WAIT instruction with the OSTDE bit being 0.

Address(es): 0008 0040h

b7 b6 b5 b4 b3 b2 b1 b0

OSTDE——————

OSTDI

Value after reset:

00000000

Bit Symbol Bit Name Description R/W

b0 OSTDIE Oscillation Stop Detection

Interrupt Enable

0: The oscillation stop detection interrupt is disabled. Oscillation stop

detection is not notified to the POE.

1: The oscillation stop detection interrupt is enabled. Oscillation stop

detection is notified to the POE.

R/W

b6 to b1 — Reserved These bits are read as 0. The write value should be 0. R/W

b7 OSTDE Oscillation Stop Detection

Function Enable

0: Oscillation stop detection function is disabled.

1: Oscillation stop detection function is enabled.

R/W

Renesas RX Series User Manual

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