參數(shù)資料
型號(hào)： μPD78058F(A)
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8 Bit Single Chip Microcontrollers
中文描述： 8位單片機(jī)微控制器
文件頁數(shù)： 33/74頁
文件大小： 549K
代理商： ΜPD78058F(A)
33
μ
PD78058F(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 system power consumption.
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. Stand-by Function
Note
The power consumption is 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.
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 stabili-
zation time is secured by the program.
Remark
CSS : Bit 4 in the PCC
9.
RESET FUNCTION
There are the following two reset methods.
External reset input by RESET pin
Internal reset by watchdog time 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
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
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