PD178046_15 Datasheet, PDF (31/42 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD178046, 178048
6. STANDBY FUNCTION
The standby function is used to reduce the current power consumption and can be used in the following two modes.
• HALT mode : The operation clock of the CPU is stopped in this mode. The average current consumption can
be reduced by using this mode in combination with the normal operation mode and operating
intermittently.
• STOP mode: The oscillation of the system clock is stopped in this mode. All the operations using the system
clock are stopped and therefore, the current consumption can be substantially reduced.
Figure 6-1. Standby Function
System clock operation
Interrupt
request
STOP
instruction
STOP mode
System clock
oscillation stops.
HALT instruction
Interrupt
request
HALT mode
Clock supply to CPU stops
but oscillation continues.
7. RESET FUNCTION
The µPD178046 and 178048 can be reset in the following three ways:
• External reset by using the RESET pin
• Internal reset by detecting hang-up time of the watchdog timer
• Internal reset by means of power-ON clear (POC)
Preliminary Product Information
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