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| 型號(hào)： | MC68HC05JB4DW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁(yè)數(shù)： | 4/134頁(yè) |
| 文件大?。?/td> | 2440K |
| 代理商： | MC68HC05JB4DW |
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February 24, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05JB4
ANALOG TO DIGITAL CONVERTER
REV 2
11.2
ADC STATUS AND CONTROL REGISTER (ADSCR)
The ADSCR is a read/write register containing status and control bits for the ADC.
Figure 11-2. A/D Status and Control Register
COCO — COnversion COmplete
1 =
An ADC conversion has completed; ADC Data Register ($0F)
contains valid conversion result.
0 =
ADC conversion not completed.
This read-only status bit is set when a conversion is completed, indicating that
the ADC Data Register contains a valid result. This COCO bit is cleared either
by a write to the ADSCR or a read of the ADC Data Register. Once the COCO
bit is cleared, a new conversion automatically starts. If the COCO bit is not
cleared, conversions are initiated every 32 cycles. In this continuous conver-
sion mode the ADC Data Register is refreshed with new data, every 32 cycles,
and the COCO bit remains set.
ADRC — ADC RC Oscillator Control
1 =
ADC uses RC oscillator as clock source.
0 =
ADC uses internal processor clock as clock source.
The RC oscillator option must be used if the internal processor is running below
1MHz. A stabilization time of typically 1ms is required when switching to the RC
oscillator option.
ADON — ADC On
1 =
ADC is switched ON.
0 =
ADC is switched OFF.
When the ADC is turned from OFF to ON, it requires a time tADON for the cur-
rent sources to stabilize. During this time ADC conversion results may be inac-
curate. Switching the ADC off disables the internal charge pump and RC
oscillator (if selected by ADRC=1), and hence saving power.
CH3:CH0 — Channel Select Bits
These four bits selects one of ten ADC channels for the conversion. Channels 0
to 5 correspond to inputs AD0-AD5 on port pins PC0-PC3, PB3 and PB4
respectively. Channels 12 and 13 are the ADC reference inputs VRH and VRL,
on port pins PC4 and PC5 respectively. Channels 14 and 15 are used for inter-
nal reference points. Table 11-1 shows the signals selected by the channel
select bits.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
ADSCR
R
COCO
ADRC
ADON
0
CH3
CH2
CH1
CH0
$000E
W
reset:
00000000
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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