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| 型號： | PIC12C67X |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory |
| 中文描述： | 8引腳，8位CMOS微控制器與A / D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲器 |
| 文件頁數(shù)： | 49/129頁 |
| 文件大小： | 931K |
| 代理商： | PIC12C67X |
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1999 Microchip Technology Inc.
DS30561B-page 49
PIC12C67X
8.2
The A/D conversion time per bit is defined as T
AD
. The
A/D conversion requires 9.5 T
AD
per 8-bit conversion.
The source of the A/D conversion clock is software
selected. The four possible options for T
AD
are:
2T
OSC
8T
OSC
32T
OSC
Internal ADC RC oscillator
For correct A/D conversions, the A/D conversion clock
(T
AD
) must be selected to ensure a minimum T
AD
time
of 1.6
μ
s. If the minimum T
AD
time of 1.6
μ
s can not be
obtained, T
AD
should be
≤
8
μ
s for preferred operation.
Table 8-1 shows the resultant T
AD
times derived from
the device operating frequencies and the A/D clock
source selected.
Selecting the A/D Conversion Clock
8.3
The ADCON1 and TRIS Registers control the opera-
tion of the A/D port pins. The port pins that are desired
as analog inputs must have their corresponding TRIS
bits set (input). If the TRIS bit is cleared (output), the
digital output level (V
OH
or V
OL
) will be converted.
The A/D operation is independent of the state of the
CHS<2:0> bits and the TRIS bits.
Configuring Analog Port Pins
Note 1:
When reading the port register, all pins
configured as analog input channel will
read as cleared (a low level). Pins config-
ured as digital inputs, will convert an ana-
log input. Analog levels on a digitally
configured input will not affect the conver-
sion accuracy.
2:
Analog levels on any pin that is defined as
a digital input (including the AN<3:0>
pins) may cause the input buffer to con-
sume current that is out of the devices
specification.
TABLE 8-1:
T
AD
vs. DEVICE OPERATING FREQUENCIES
AD Clock Source (T
AD
)
Device Frequency
Operation
2T
OSC
ADCS<1:0>
4 MHz
1.25 MHz
1.6
μ
s
6.4
μ
s
333.33 kHz
6
μ
s
00
500 ns
(2)
2.0
μ
s
8.0
μ
s
8T
OSC
01
24
μ
s
(3)
96
μ
s
(3)
2 - 6
μ
s
(1)
32T
OSC
10
25.6
μ
s
(3)
2 - 6
μ
s
(1,4)
Internal ADC RC Oscillator
(5)
Note 1:
The RC source has a typical T
AD
time of 4
μ
s.
2:
These values violate the minimum required T
AD
time.
3:
For faster conversion times, the selection of another clock source is recommended.
4:
While in RC mode, with device frequency above 1 MHz, conversion accuracy is out of specification.
5:
For extended voltage devices (LC), please refer to Electrical Specifications section.
11
2 - 6
μ
s
(1,4)
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