參數(shù)資料
型號: μPD789406
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): 58/128頁
文件大?。?/td> 607K
代理商: ΜPD789406
58
μ
PD789405, 789406, 789407
5.7.3 8-bit A/D converter control registers
The following two registers are used to control the 8-bit A/D converter.
A/D converter mode register (ADM)
A/D input selection register (ADS)
(1) A/D converter mode register (ADM)
The ADM specifies the conversion time for analog inputs. It also specifies whether to enable conversion.
The ADM can be manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears the ADM to 00H.
Figure 5-26. A/D Converter Mode Register Format
A/D conversion control
ADCS
0
FR2
FR1
FR0
0
0
0
ADM
Symbol
Address
When reset
R/W
FF80H
00H
R/W
7
6
5
4
3
2
1
0
ADCS
0
1
A/D conversion time selection
Note 1
FR2
0
0
0
1
1
1
144/fx
120/fx
96/fx
72/fx
60/fx
48/fx
FR1
0
0
1
0
0
1
(28.8 s)
(24 s)
(19.2 s)
(14.4 s)
(not to be set
Note 2
)
(not to be set
Note 2
)
FR0
0
1
0
0
1
0
Other settings
Conversion disabled
Conversion enabled
Not to be set
Notes 1.
The specifications of FR2, FR1, and FR0 must be such that the A/D conversion time is at least
14
μ
s.
2.
These bit combinations must not be used, as the A/D conversion time will fall below 14
μ
s.
Caution
The result of conversion performed immediately after bit 7 (ADCS) is set is undefined.
Remarks 1.
f
X
: Main system clock oscillation frequency
2.
The parenthesized values apply to operation at f
X
= 5.0 MHz.
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