HD4074329US View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

HD4074329US

microcomputer designed to increase program productivity

Renesas Electronics 

HD404054 Series/HD404094 Series

Stop

Standby

Oscillator: Stop

Peripheral clocks: Stop

All other clocks: Stop

Oscillator: Active

Peripheral clocks: Active

All other clocks: Stop

No

RESET = 0?

Yes

No

STOPC = 0?

Yes

RAME = 1

No

RESET = 0?

Yes

No

IF0 • IM0 = 1?

Yes

No

IF1 • IM1 = 1?

Yes IFTA • IMTA No

= 1?

Yes

RAME = 0

IFTC • No

IMTC = 1?

Yes

IFTD •

No

IMTD = 1?

Yes

IFS1 •

No

IMS1 = 1?

Yes

Restart

processor clocks

Restart

processor clocks

Execute

next instruction

Reset MCU

No

Execute

next instruction

IF = 1,

IM = 0, and

IE = 1?

Yes

Accept interrupt

Figure 12 MCU Operation Flowchart

Stop Mode: In stop mode, all MCU operations stop and RAM data is retained. Therefore, the power

dissipation in this mode is the least of all modes. The OSC1 and OSC2 oscillator stops. The MCU enters

stop mode if the STOP instruction is executed in active mode.

Stop mode is terminated by a RESET input or a STOPC input as shown in figure 13. RESET or STOPC

must be applied for at least one tRC to stabilize oscillation (refer to the AC Characteristics section). When

the MCU restarts after stop mode is cancelled, all RAM contents before entering stop mode are retained,

but the accuracy of the contents of the accumulator, B register, W register, X/SPX register, Y/SPY register,

carry flag, and serial data register cannot be guaranteed.

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