MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 132

• Manufacturer Part Number: MC68HC705X32CFU
• Manufacturer: Freescale Semiconductor

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

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