UPD784031A View Datasheet(PDF) - NEC => Renesas Technology
Part Name
Description
View to exact match
UPD784031A Datasheet PDF : 90 Pages
| |||
µPD784031
11. STANDBY FUNCTION
The standby function allows the power consumption of the chip to be reduced. The following standby modes are
supported:
• HALT mode : The CPU operation clock is stopped. By occasionally inserting the HALT mode during normal
operation, the overall average power consumption can be reduced.
• IDLE mode : The entire system is stopped, with the exception of the oscillator circuit. This mode consumes
only very little more power than STOP mode, but normal program operation can be restored in
almost as little time as that required to restore normal program operation from HALT mode.
• STOP mode : The oscillator is stopped. All operations in the chip stop, such that only leakage current flows.
These modes can be selected by software.
A macro service can be initiated in HALT mode.
Figure 11-1. Standby Mode Status Transition
Wait for
oscillation
settling
Otimsceillealtaiopnsessettling
Program
operation
Macro service request
End of one operation
End of macro service
Macro
service
SRetESSTEOTPinput
STOP
(standby)
IDLE
(standby)
Request for masked interrupt
HALT
(standby)
Notes 1. INTP4 and INTP5 are applied when not masked.
2. Only when the interrupt request is not masked
Remark NMI is enabled only by external input. The watchdog timer cannot be used to release one of the standby
modes (STOP or IDLE mode).
50
|
|
Share Link: 