UPD78F9418AGK-9EU Renesas Electronics America, UPD78F9418AGK-9EU Datasheet - Page 246

• Manufacturer Part Number: UPD78F9418AGK-9EU
• Manufacturer: Renesas Electronics America

Specifications of UPD78F9418AGK-9EU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

16.1 Standby Function and Configuration
16.1.1 Standby function
two modes:
all retained. In addition, the statuses of the output latch of the I/O ports and output buffer are also retained.
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The standby function is used to reduce the power consumption of the system and can be effected in the following
(1)
(2)
In both modes, the previous contents of the registers, flags, and data memory before setting the standby mode are
Caution To set the STOP mode, be sure to stop the operations of the peripheral hardware, and then
HALT mode
This mode is set when the HALT instruction is executed. The HALT mode stops the operation clock of the
CPU. The system clock oscillator continues oscillating. This mode does not reduce the power consumption
as much as the STOP mode, but is useful for resuming processing immediately when an interrupt request is
generated, or for intermittent operations.
STOP mode
This mode is set when the STOP instruction is executed. The STOP mode stops the main system clock
oscillator and stops the entire system. The power consumption of the CPU can be substantially reduced in
this mode.
The data memory can be retained at the low voltage (V
retaining the contents of the data memory at an extremely low current.
The STOP mode can be released by an interrupt request, so that this mode can be used for intermittent
operation. However, some time is required until the system clock oscillator stabilizes after the STOP mode
has been released. If processing must be resumed immediately by using an interrupt request, therefore, use
the HALT mode.
execute the STOP instruction.
CHAPTER 16 STANDBY FUNCTION
User’s Manual U13952EJ3V1UD
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= 1.8 V). Therefore, this mode is useful for