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參數(shù)資料
| 型號(hào)： | μPD78078Y |
| 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)： | 34/84頁 |
| 文件大?。?/td> | 625K |
| 代理商： | ΜPD78078Y |
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34
μ
PD78076Y, 78078Y
7. EXTERNAL DEVICE EXPANSION FUNCTIONS
The external device expansion functions connect external devices to areas other than the internal ROM, RAM
and SFR.
External devices connection uses ports 4 to 6 and port 8.
The external device expansion function has the following two modes:
Separate bus mode
: External devices are connected by using an independent address bus and data
bus. Because an external latch circuit is not necessary, this mode is effective for
reducing the number of components and the mounting area on a printed wiring
board.
Multiplexed bus mode
: External devices are connected by using a time-division multiplexed address/data
bus. This mode can reduce the number of ports used when external devices are
connected.
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 can be 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 MCC (bit 7 in the
processor clock control register (PCC)). In this case, a STOP instruction cannot be used.
Caution
When switching on the main system clock again after the subsystem clock has been used with the
main system clock stopped, be sure to provide enough time for oscillation stabilization with the
program first.
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 oscillation
is retained.)
HALT instruction
HALT mode
Note
(Supply of clock to CPU is
stopped although oscillation
is retained.)
CSS = 1
CSS = 0
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