參數(shù)資料
型號: μPD789198
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): 96/146頁
文件大?。?/td> 630K
代理商: ΜPD789198
Preliminary Product Information
96
μ
PD789186, 789187, 789196, 789197
6.10.3 Low-voltage indicator control register
Low-voltage indicator register 0 (LVI0) is used to control the low-voltage indicator.
Low-voltage indicator register 0 (LVI0)
LVI0 is used to enable and disable low-voltage indicator operation.
LVI0 is manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears LVI0 to 00H.
Figure 6-46. Format of Low-Voltage Indicator Register 0
LVION0
0
0
0
0
0
0
LVIOUT0
LVI0
Symbol
Address
When reset
R/W
FFDFH
00H
R/W
Note
6
7
5
4
3
2
1
0
LVION0
1
Low-voltage indicator operation is disabled.
Low-voltage indicator operation is enabled.
0
Low-voltage indiator operation start control bit
LVIOUT0
0
1
Low-voltage indicator result output bit
When power supply voltage
detected voltage, or the low-voltage indicator is stopped
When power supply voltage > detected voltage
Note
Bit 0 is a read-only bit.
Cautions 1.
Bits 1 to 7 must be fixed to 0.
The operation of the low-voltage indicator does not become stable for the operation start
time (500
μ
s) after the indicator is enabled.
Before the generation of an interrupt can be specified using the low-voltage indicator, the
current power supply voltage status must be checked by reading the value of the detection
result output bit.
If operation is enabled at standby time (HALT or STOP), the standby state can be released by
an interrupt request signal.
2.
3.
4.
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