參數(shù)資料
型號(hào)： μPD780204
廠商： NEC Corp.
英文描述： 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述： 8位單片機(jī)微控制器（8位單片微控制器）
文件頁(yè)數(shù)： 31/78頁(yè)
文件大?。?/td> 406K
代理商： ΜPD780204
m
PD780204, 780205, 780206, 780208
31
7. STANDBY FUNCTION
The standby function is to reduce the current dissipation of the system and can be effected in the following two modes:
HALT mode:
In this mode, the operating clock of the CPU is stopped. By using this mode in combination with
the normal operation mode, the system can be operated intermittently, so that the average current
dissipation can be reduced.
Oscillation of the main system clock is stopped. All the operations on the main system clock are
stopped, and therefore, the current dissipation of the system can be minimized with only the
subsystem clock oscillating.
STOP mode:
Figure 7-1. Standby Function
STOP mode
(Oscillation of main system
clock stopped)
Main system
clock operation
Subsystem
clock operation
Note
HALT mode
(Clock supply to CPU stopped.
Oscillation continues)
HALT mode
Note
(Clock supply to CPU stopped.
Oscillation continues)
STOP
instruction
Interrupt
request
Interrupt
request
CSS=0
CSS=1
HALT instruction
Interrupt
request
HALT instruction
Note
By stopping the main system clock, the current dissipation can be reduced. When the CPU operates on the
subsystem clock, stop the main system clock by setting the MCC. The STOP instruction cannot be used.
Caution
To select the main system clock again after the main system clock has been stopped once while the
subsystem clock is in use, make sure through the program that the oscillation stabilization time
elapses, and then that the main system clock is selected.
8. RESET FUNCTION
The system can be reset in the following two modes:
External reset by RESET pin
Internal reset by watchdog timer that detects hang up
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