MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 130

• 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
The A/D reference input (AN0–AN7) is applied to a precision internal D/A converter. Control logic
drives this D/A converter and the analog output is successively compared with the analog input
sampled at the beginning of the conversion. The conversion is monotonic with no missing codes.
The result of each successive comparison is stored in the SAR and, when the conversion is
complete, the contents of the SAR are transferred to the read-only result data register ($08), and
the conversion complete flag, COCO, is set in the A/D status/control register ($09).
Warning: Any write to the A/D status/control register will abort the current conversion, reset the
At power-on or external reset, both the ADRC and ADON bits are cleared; thus the A/D is disabled.
(VRH+VRL)/2
VRH
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
VRL
conversion complete flag and start a new conversion on the selected channel.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 9-1 A/D converter block diagram
ANALOG TO DIGITAL CONVERTER
A/D result register (ADDATA) $08
Result
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Successive approximation
register (SAR) and control
with sample and hold
8-bit capacitive DAC
A/D status/control register (ADSTAT)$09
CH0
CH1
CH2
CH3
0
ADON
VRH
VRL
MC68HC05X16
ADRC
COCO
Rev. 1