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參數(shù)資料
| 型號： | UPD6604GS |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION |
| 中文描述： | 4位單片機的紅外遙控傳輸 |
| 文件頁數(shù)： | 22/64頁 |
| 文件大?。?/td> | 268K |
| 代理商： | UPD6604GS |
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22
μ
PD6604
Data Sheet U11281EJ3V0DS00
5. STANDBY FUNCTION
5.1 Outline of Standby Function
To save current consumption, two types of standby modes, i.e., HALT mode and STOP mode, are made available.
In STOP mode, the system clock stops oscillation. At this time, the OSC
IN
and OSC
OUT
pins are fixed at 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 register, 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 5-1. Statuses During Standby Mode
STOP Mode
HALT Mode
Setting instruction
HALT instruction
Clock oscillation circuit
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
Immediately preceding status retained
Timer
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 canceled, the status flag (F) is set (to 1).
3. If, at the point the standby mode has been set, its cancelation condition is met, then the
system is not placed in the standby mode. However, the status flag (F) is set (1).
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