HD64F38602R Datasheet, PDF (128/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 5 Power-Down Modes
5.4 Module Standby Function
The module-standby function can be set to any peripheral module. In module standby mode, the
clock supply to modules stops to enter the power-down mode. Module standby mode enables each
on-chip peripheral module to enter the standby state by clearing a bit that corresponds to each
module in CKSTPR1 and CKSTPR2 to 0 and cancels the mode by setting the bit to 1. (See section
5.1.3, Clock Halt Registers 1 and 2 (CKSTPR1 and CKSTPR2).)
5.5 On-Chip Oscillator and Operation Mode
The on-chip oscillator can be used as the clock source for the watchdog timer (WDT), subclock
generation circuit (φ_W = R_OSC/32), and system clock generation circuit (φ_OSC = R_OSC).
When the on-chip oscillator is used as the clock source for the watchdog timer (WDT), it operates
in any modes, such as active, sleep, subactive, subsleep, watch, and standby modes.
When the on-chip oscillator is used as the clock source for the subclock generation circuit, it stops
in standby mode and operates in other modes.
When the on-chip oscillator is used only as the clock source for the system clock generation
circuit, it operates in active and sleep modes but halts the operation in subactive, subsleep, watch,
and standby modes.
When the on-chip oscillator is not used as the clock source for the watchdog timer (WDT),
subclock generation circuit, or system clock generation circuit, it halts the operation.
The on-chip oscillator operates at a reset and after a reset, because the watchdog timer (WDT)
selects the on-chip oscillator as the clock source for the initial value.
Rev. 3.00 May 15, 2007 Page 96 of 516
REJ09B0152-0300