參數(shù)資料
型號: μPD789186
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): 61/146頁
文件大?。?/td> 630K
代理商: ΜPD789186
Preliminary Product Information
61
μ
PD789186, 789187, 789196, 789197
6.7.3
A/D converter control registers
The following two registers are used to control the A/D converter.
A/D converter mode register 0 (ADM0)
A/D input selection register 0 (ADS0)
(1) A/D converter mode register 0 (ADM0)
ADM0 specifies the conversion time for analog inputs. It also specifies whether to enable conversion.
ADM0 is manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears ADM0 to 00H.
Figure 6-29. A/D Converter Mode Register 0 Format
A/D conversion control
ADCS0
0
FR02 FR01 FR00
0
0
0
ADM0
Symbol
Address
When reset
R/W
FF80H
00H
R/W
7
6
5
4
3
2
1
0
ADCS0
0
1
A/D conversion time selection
Note 1
FR02
0
0
0
1
1
1
144/fx
120/fx
96/fx
72/fx
60/fx
48/fx
FR01
0
0
1
0
0
1
(28.8 s)
(24 s)
(19.2 s)
(14.4 s)
(not to be specified
Note 2
)
(not to be specified
Note 2
)
FR00
0
1
0
0
1
0
Other settings
Conversion disabled
Conversion enabled
Not to be specified
Notes 1.
The specifications of FR02, FR01, and FR00 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.
Cautions 1.
The result of conversion performed immediately after bit 7 (ADCS0) is set is undefined.
Bits 0 to 2 and bit 6 must be fixed to 0.
2.
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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