UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 295

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

16.1 Standby Function and Configuration
16.1.1 Standby function
two modes.
are all retained. In addition, the statuses of the output latch of the I/O ports and output buffer are also retained.
The standby function is used to reduce the current consumption of the system and can be effected in the following
(1) HALT mode
(2) STOP mode
In both modes, the previous contents of the registers, flags, and data memory before setting the standby mode
Cautions 1. To set the STOP mode, be sure to stop the operations of the peripheral hardware before
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 current consumption
as much as the STOP mode, but is useful for resuming processing immediately when an interrupt request
is generated, or for intermittent operations such as a watch operation.
This mode is set when the STOP instruction is executed. The STOP mode stops the system clock oscillator
and stops the entire system. The current consumption of the CPU can be substantially reduced in this mode.
The low voltage (V
the contents of the data memory at an extremely low current.
The STOP mode can be released by an interrupt request, so this mode can be used for intermittent operation.
However, a certain amount of time is required until the system clock oscillator stabilizes after the STOP mode
is released. If processing must be resumed immediately by using an interrupt request, therefore, use the HALT
mode.
2. To reduce the current consumption of the A/D converter, clear bit 7 (ADCS0) of A/D converter
executing the STOP instruction.
mode register 0 (ADM0) to 0 to stop A/D conversion, and then execute the HALT or STOP
instruction.
DD
= 2.0 V) of the data memory can be retained. Therefore, this mode is useful for retaining
CHAPTER 16 STANDBY FUNCTION
User’s Manual U13029EJ7V1UD
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