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參數(shù)資料
| 型號： | μPD78015F |
| 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） |
| 文件頁數(shù)： | 30/74頁 |
| 文件大?。?/td> | 567K |
| 代理商： | ΜPD78015F |
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30
μ
PD78011F, 78012F, 78013F, 78014F, 78015F, 78016F, 78018F
7. EXTERNAL DEVICE EXPANSION FUNCTIONS
The external device expansion function is used to connect external devices to areas other than the internal ROM, RAM
and SFR.
Ports 4 to 6 are used for connection with external devices.
8. STANDBY FUNCTIONS
There are the following two standby functions to reduce the current dissipation.
HALT mode
: The CPU operating clock is stopped. The average consumption current can be reduced by intermittent
operation in combination with the normal operat ing mode.
STOP mode
: The main system clock oscillation is stopped. The whole operation by the main system clock
is stopped, so that the system operates withultra-low power consumption using only the subsystem
clock.
Figure 8-1. Standby Functions
Note
The power consumption can be reduced by stopping the main system clock. When the CPU is operating on the
subsystem clock, set the bit 7 (MCC) of the processor clock control register (PCC) to stop the main system clock.
The STOP instruction cannot be used.
Caution
When the main system clock is stopped and the system is operated by the subsystem clock, the
subsystem clock should be switched again to the main system clock after the oscillation stabilization
time is secured by the program by the program.
9.
RESET FUNCTIONS
There are the following two reset methods.
External reset input by RESET pin.
Internal reset by watchdog timer runaway time detection.
Main System
Clock Operation
STOP Mode
(Main system clock
oscillation stopped)
HALT Mode
(Clock supply to CPU is
stopped, oscillation)
Subsystem Clock
Operation
HALT Mode
Note
(Clock supply to CPU is
stopped, oscillation)
Interrupt
Request
Interrupt
Request
Interrupt
Request
HALT
Instruction
HALT
Instruction
STOP
Instruction
CSS=1
CSS=0
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