參數(shù)資料
型號: μPD78F9217Y
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): 62/148頁
文件大小: 621K
代理商: ΜPD78F9217Y
Preliminary Product Information
62
μ
PD78F9217Y
7.7.3
A/D converter control registers
The following two types of 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 7-29. Format of A/D Converter Mode Register 0
A/D conversion control
ADCS0
0
1
A/D conversion time selection
Note 1
FR02
0
0
0
1
1
1
144/f
CC
120/f
CC
96/f
CC
72/f
CC
60/f
CC
48/f
CC
FR01
0
0
1
0
0
1
(36 s)
(30 s)
(24 s)
(18 s)
(15 s)
(Not to be set
Note 2
)
FR00
0
1
0
0
1
0
Other settings
Conversion disabled
Conversion enabled
Not to be set
7
ADCS0
0
FR02
FR01
FR00
0
0
0
ADM0
6
5
4
Symbol
Address
When reset
R/W
FF80H
00H
R/W
3
2
1
0
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.
2. The conversion result may be undefined after ADCS0 has been cleared to 0.
Read the conversion result during A/D operation. To read the conversion result after
stopping A/D operation, stop the A/D operation after the completion of A/D conversion but
before the completion of the next conversion.
3.
Bits 0 to 2 and bit 6 must be fixed to 0.
Remarks 1.
f
CC
: Main system clock oscillation frequency
2.
The parenthesized values apply to operation at f
CC
= 4.0 MHz.
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