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參數(shù)資料
| 型號： | μPD78070A |
| 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位單片機微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 34/74頁 |
| 文件大小： | 481K |
| 代理商： | ΜPD78070A |
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m
PD78070A
34
7.
EXTERNAL DEVICE EXPANSION FUNCTIONS
The external device expansion functions connect external devices to areas other than the RAM and SFR.
The
m
PD78070A is a ROM-less product, and therefore requires the connection of external ROM.
Connect external devices using an independent address bus and data bus.
8.
STANDBY FUNCTION
The standby function is designed to reduce current consumption.
It has the following two modes:
HALT mode :
In this mode, the CPU operation clock is stopped. The average current consumption can be
reduced by intermittent operation by combining this mode with the normal operation mode.
STOP mode :
In this mode, oscillation of the main system clock is stopped. All the operations performed
on the main system clock are suspended, and only the subsystem clock is used for extremely
small power consumption.
Figure 8-1. Standby Function
Note
Current consumption is reduced by shutting off the main system clock. If the CPU is operating on the subsystem
clock, shut off the main system clock by setting bit 7 (MCC) of the processor clock control register (PCC).
You cannot use a STOP instruction.
Caution
When the main system clock is stopped and the device is operating on the subsystem clock, wait until
the oscillation stabilization time has been secured by the program before switching back to the main
system clock.
9.
RESET FUNCTION
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
Subsystem clock operation
Note
Interrupt
request
STOP
instruction
STOP mode
(Oscillation of the main system
clock is stopped.)
Interrupt
request
Interrupt
request
HALT instruction
HALT mode
(Supply of clock to CPU is
stopped although clock
is generated.)
HALT instruction
HALT mode
Note
(Supply of clock to CPU is
stopped although clock
is generated.)
CSS = 1
CSS = 0
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