參數(shù)資料
型號: 6P8A
廠商: NEC Corp.
英文描述: MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
中文描述: 馬鞍山集成電路4位單片機的紅外遙控傳輸
文件頁數(shù): 33/95頁
文件大?。?/td> 692K
代理商: 6P8A
33
μ
PD6P8, 6P8A, 6P8B
Data Sheet U17848EJ3V0DS
6. STANDBY FUNCTION
6.1 Outline of Standby Function
To save current consumption, two types of standby modes, i.e., HALT mode and STOP mode, have been provided
available.
In STOP mode, the system clock stops oscillation. At this time, the X
IN
and X
OUT
pins are fixed to a low level.
In HALT mode, CPU operation halts, while the system clock continues oscillation. When in HALT mode, the
timer (including REM output and LED output) operates.
In either STOP mode or HALT mode, the statuses of the data memory, accumulator, and port registers, etc.
immediately before the standby mode is set are retained. Therefore, make sure to set the port status for the system
so that the current consumption of the whole system is suppressed before the standby mode is set.
Table 6-1. Statuses During Standby Mode
STOP Mode
HALT Mode
Setting instruction
HALT instruction
Clock oscillator
Oscillation stopped
Oscillation continued
CPU
Operation halted
Data memory
Immediately preceding status retained
Operation
Accumulator
Immediately preceding status retained
statuses
Flag
F
0 (When 1, the flag is not placed in the standby mode.)
CY
Immediately preceding status retained
Port register
Timer
Immediately preceding status retained
Operation halted
(The count value is reset to “0”)
Operable
Cautions
1. Write the NOP instruction as the first instruction after STOP mode is released.
2. When standby mode is released, the status flag (F) is set (to 1).
3. If, at the point the standby mode has been set, its release condition is met, then the system
does not enter the standby mode. However, the status flag (F) is set (1).
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