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參數(shù)資料
| 型號： | μPD78054(A) |
| 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)： | 33/76頁 |
| 文件大?。?/td> | 386K |
| 代理商： | ΜPD78054(A) |
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33
μ
PD78052(A), 78053(A), 78054(A)
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 consumption current.
HALT mode
: The CPU operating clock is stopped.
The average consumption current can be reduced by intermittent operation in combination with
the normal operating 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 power consumption using only the
subsystem clock.
STOP mode
Figure 8-1. Standby Function
Note
The consumption current can be reduced by stopping the main system clock. When the CPU is operating
on the subsystem clock, set bit 7 (MCC) in the processor clock control register (PCC) to stop the main system
clock. The STOP instruction cannot be used.
9.
RESET FUNCTION
There are the following two reset methods.
External reset by RESET pin
Internal reset by watchdog timer runaway time detection
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.
Remark
CSS : bit 4 in the PCC
Main System
Clock Operation
STOP Mode
(Main system clock
oscillation stopped)
HALT Mode
(Clock supply to CPU
is stopped, oscillation
maintained)
Subsystem Clock
Operation
Note
HALT Mode
Note
(Clock supply to CPU
is stopped, oscillation
maintained)
Interrupt
Request
Interrupt
Request
Interrupt
Request
HALT
Instruction
HALT
Instruction
STOP
Instruction
CSS = 1
CSS = 0
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