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参数资料
型号： RFPIC12F675K-E/SS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO20
封装： 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件页数： 61/123页
文件大小： 5438K
代理商： RFPIC12F675K-E/SS
rfPIC12F675
DS70091A-page 40
Preliminary
2003 Microchip Technology Inc.
TABLE 7-1:
TAD vs. DEVICE OPERATING FREQUENCIES
7.1.5
STARTING A CONVERSION
The A/D conversion is initiated by setting the
GO/DONE bit (ADCON0<1>). When the conversion is
complete, the A/D module:
Clears the GO/DONE bit
Sets the ADIF flag (PIR1<6>)
Generates an interrupt (if enabled).
If the conversion must be aborted, the GO/DONE bit
can be cleared in software. The ADRESH:ADRESL
registers will not be updated with the partially complete
A/D
conversion
sample.
Instead,
the
ADRESH:ADRESL registers will retain the value of the
previous conversion. After an aborted conversion, a
2T
AD delay is required before another acquisition can
be initiated. Following the delay, an input acquisition is
automatically started on the selected channel.
7.1.6
CONVERSION OUTPUT
The A/D conversion can be supplied in two formats: left
or right shifted. The ADFM bit (ADCON0<7>) controls
the output format. Figure 7-2 shows the output formats.
FIGURE 7-2:
10-BIT A/D RESULT FORMAT
A/D Clock Source (T
AD)
Device Frequency
Operation
ADCS2:ADCS0
20 MHz
5 MHz
4 MHz
1.25 MHz
2 T
OSC
000
100 ns(2)
400 ns(2)
500 ns(2)
1.6
s
4 T
OSC
100
200 ns(2)
800 ns(2)
1.0
s(2)
3.2
s
8 T
OSC
001
400 ns(2)
1.6
s
2.0
s
6.4
s
16 T
OSC
101
800 ns(2)
3.2
s
4.0
s
12.8
s(3)
32 T
OSC
010
1.6
s
6.4
s
8.0
s(3)
25.6
s(3)
64 T
OSC
110
3.2
s
12.8
s(3)
16.0
s(3)
51.2
s(3)
A/D RC
x11
2 - 6
s(1,4)
2 - 6
s(1,4)
2 - 6
s(1,4)
2 - 6
s(1,4)
Legend: Shaded cells are outside of recommended range.
Note 1: The A/D RC source has a typical T
AD time of 4
s for VDD > 3.0V.
2: These values violate the minimum required T
AD time.
3: For faster conversion times, the selection of another clock source is recommended.
4: When the device frequency is greater than 1 MHz, the A/D RC clock source is only recommended if the
conversion will be performed during SLEEP.
Note:
The GO/DONE bit should not be set in the
same instruction that turns on the A/D.
ADRESH
ADRESL
(ADFM = 0)
MSB
LSB
Bit 7
Bit 0
Bit 7
Bit 0
10-bit A/D Result
Unimplemented: Read as ‘0’
(ADFM = 1)
MSB
LSB
Bit 7
Bit 0
Bit 7
Bit 0
Unimplemented: Read as ‘0
10-bit A/D Result
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