HD404816FS datasheet(30/100 Pages) RENESAS

30 / 100 page

HD404818 Series

Reset

f :

CPU

CLK

PER

OSC

Operating

Stopped

cyc

f :

CPU

CLK

PER

OSC

Operating

Stopped

SUB

cyc

f :

CPU

CLK

PER

OSC

Operating

cyc

f :

CPU

CLK

PER

OSC

Operating

cyc

SUB

cyc

f :

CPU

CLK

PER

OSC

Stopped

Operating

SUB

f :

CPU

CLK

PER

OSC

Stopped

Operating

Stopped

f :

CPU

CLK

PER

OSC

Stopped

Operating

Stopped

SUB

f :

CPU

CLK

PER

OSC

Stopped

Operating

Stopped

SUB

Standby mode

Stop mode

(TMA3 = 0)

Watch mode

Subactive mode

(TMA3 = 1)

(TMA3 = 1, LSON = 0)

(TMA3 = 1, LSON = 1)

(TMA3 = 0)

SBY (standby)

Interrupt

Timers A, B, C

Serial,

INT , INT

SBY (standby)

Interrupt

STOP

INT ,

Timer A

INT ,

Timer A

STOP

STOP/SBY

(LSON = 1)

1. Time-base interrupt

2. STOP/SBY (DTON = 1, LSON = 0)

3. STOP/SBY (DTON = 0, LSON = 0)

4. DTON is not affected

f :

LSON:

DTON:

cyc

SUB

OSC

Main oscillation frequency

Suboscillation frequency

for time-base

f /8

System clock

Clock for time-base

Clock for other

peripheral functions

Low speed on flag

Direct transfer on flag

OSC

CPU

CLK

PER

Active mode

Timers A, B, C

Serial,

INT , INT

Notes:

Figure 9 MCU Status Transitions

Active Mode: The MCU operates according to the clock generated by the system oscillators OSC

1 and

OSC

Standby Mode: The MCU enters standby mode when the SBY instruction is executed from active mode.

In this mode, the oscillators, interrupts, timer/counters, and serial interface continue to operate, but all

instruction execution-related clocks stop. The stopping of these clocks stops the CPU, retaining all RAM

and register contents and maintaining the current I/O pin status.

Standby mode is terminated by a RESET input oran interrupt request. If it is terminated by a RESET input,

the MCU is reset as well. After an interrupt request, the MCU enters active mode and resumes, executing

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