HD4046212RFS datasheet(60/157 Pages) RENESAS

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HD404629R Series

Prescalers

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

The prescalers operating conditions are listed in table 25, and the prescalers output supply is shown in

figure 42. The timers A–D input clocks except external events, the serial transmit clock except the external

clock, and the LCD circuit operating 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 25 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

LCD

Timer A

Timer B

Timer C

Timer D

Serial

System

clock

Prescaler S

Clock

selector

Figure 42 Prescaler Output Supply

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