HD404369F datasheet(55/117 Pages) RENESAS

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HD404369 Series

Prescalers

The MCU has the following two prescalers, S and W.

The prescaler operating conditions are listed in table 24, and the prescaler output supply is shown in figure

35. The timer A–C input clocks except external events and the serial transmit clock except the external

clock are selected from the prescaler outputs, depending on corresponding mode registers.

Prescaler Operation

Prescaler S: 11-bit counter that inputs the system clock signal. After being reset to $000 by MCU reset,

prescaler S divides the system clock. Prescaler S keeps counting, except in watch and subactive modes and

at MCU reset.

Prescaler W: Five-bit counter that inputs the X1 input clock signal (32-kHz crystal oscillation) divided by

eight. After being reset to $00 by MCU reset, prescaler W divides the input clock. Prescaler W can be reset

by software.

Table 24

Prescaler Operating Conditions

Prescaler

Input Clock

Reset Conditions

Stop Conditions

Prescaler S

System clock

(in active and standby

mode), subsystem clock

(in subactive mode)

MCU reset

MCU reset, stop mode,

watch mode

Prescaler W

32-kHz crystal oscillation

MCU reset, software

MCU reset, stop mode

Subsystem

clock

Prescaler W

Timer A

Timer B

Timer C

Serial

Alarm output

circuit

System

clock

Prescaler S

Clock

selector

fX/8

fX/4 or fX/8

Figure 35 Prescaler Output Supply

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