MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 132
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MC68HC705X32CFU
Manufacturer Part Number
MC68HC705X32CFU
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68HC705X32CFU.pdf
(232 pages)
Specifications of MC68HC705X32CFU
Cpu Family
HC05
Device Core Size
8b
Frequency (max)
4MHz
Interface Type
SCI
Program Memory Type
EPROM
Program Memory Size
32KB
Total Internal Ram Size
528Byte
# I/os (max)
32
Number Of Timers - General Purpose
1
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
4.5V
On-chip Adc
8-chx8-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
64
Package Type
PQFP
Lead Free Status / Rohs Status
Supplier Unconfirmed
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC68HC705X32CFU4
Manufacturer:
FREESCALE
Quantity:
20 000
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9
9.2.3
COCO — Conversion complete flag
Reset clears the COCO flag.
ADRC — A/D RC oscillator control
The ADRC bit allows the user to control the A/D RC oscillator, which is used to provide a
sufficiently high clock rate to the A/D to ensure accuracy when the chip is running at low speeds.
When the A/D RC oscillator is turned on, it takes a time t
this time A/D conversion results may be inaccurate.
Note:
Power-on or external reset clears the ADRC bit.
A/D status/control (ADSTAT)
1 (set)
0 (clear) –
1 (set)
0 (clear) –
If the MCU bus clock falls below 1MHz, the A/D RC oscillator should be switched on.
A/D status/control register (ADSTAT)
–
–
ADRC
Freescale Semiconductor, Inc.
0
0
1
1
result to be read from the A/D result data register ($08). The
converter then starts a new conversion.
status/control register.
ADON is set, the A/D runs from the RC oscillator clock. See
and, if ADON is set, the A/D runs from the CPU clock.
COCO is set each time a conversion is complete, allowing the new
COCO is cleared by reading the result data register or writing to the
When the ADRC bit is set, the A/D RC oscillator is turned on and, if
When the ADRC bit is cleared, the A/D RC oscillator is turned-off
For More Information On This Product,
ADON
Address
0
1
0
1
$0009
ANALOG TO DIGITAL CONVERTER
Table 9-1 A/D clock selection
Go to: www.freescale.com
oscillator
COCO ADRC ADON
bit 7
OFF
OFF
RC
ON
ON
bit 6
converter
OFF
OFF
A/D
ON
ON
bit 5
A/D switched off.
A/D using CPU clock.
Allows the RC oscillator to stabilize.
A/D using RC oscillator clock.
ADRC
bit 4
0
to stabilize (see
Comments
CH3
bit 3
CH2
bit 2
bit 1
CH1
Table
Table
MC68HC05X16
CH0
bit 0
12-3). During
9-1.
0000 0000
on reset
State
Rev. 1
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