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參數(shù)資料
| 型號： | μPD78055Y |
| 廠商： | NEC Corp. |
| 英文描述： | 8Bit Single Chip Microcontrollers(8位單片微控制器) |
| 中文描述： | 8位單芯片微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 33/74頁 |
| 文件大?。?/td> | 574K |
| 代理商： | ΜPD78055Y |
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33
μ
PD78052Y, 78053Y, 78054Y, 78055Y, 78056Y, 78058Y
Main System
Clock Operation
STOP Mode
(Main system clock
oscillation stopped)
HALT Mode
(Clock supply to CPU is
stopped, oscillation)
Subsystem Clock
Operation
Note
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
7.
EXTERNAL DEVICE EXPANSION FUNCTIONS
The external device expansion functions connect external devices to areas other than the internal ROM, RAM,
and SFR. Ports 4 to 6 are used for external device connection.
8.
STANDBY FUNCTION
There are the following two standby functions to reduce the system current consumption.
HALT mode
: The CPU operating clock is stopped.
The average current consumption can be reduced by intermittent operation in combination with
the normal operating 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 with ultra-low current consumption using only the
subsystem clock.
Figure 8-1. Standby Function
Note
The current consumption can be reduced by stopping the main system clock.
When the CPU is operating on the subsystem clock, set bit 7 (MCC) of 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.
9.
RESET FUNCTION
There are the following two reset methods.
External reset input by RESET pin
Internal reset by watchdog time runaway time detection
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