MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 58

• 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

4
4.4
This 8-bit input-only port shares its pins with the A/D converter subsystem. When the A/D
converter is enabled, pins PD0-PD7 read the eight analog inputs to the A/D converter. Port D can
be read at any time, however, if it is read during an A/D conversion sequence noise, may be
injected on the analog inputs, resulting in reduced accuracy of the A/D. Furthermore, performing
a digital read of port D with levels other than V
power dissipation during the read cycle.
As port D is an input-only port there is no DDR associated with it. Also, at power up or external
reset, the A/D converter is disabled, thus the port is configured as a standard input-only port.
Note:
4.5
The following sections explain in detail the individual bits in the data and control registers
associated with the ports.
4.5.1
Each bit can be configured as input or output via the corresponding data direction bit in the port
data direction register (DDRx).
The state of the port data registers following reset is not defined.
Port B data (PORTB)
Port A data (PORTA)
It is recommended that all unused input ports and I/O ports be tied to an appropriate
logic level (i.e. either V
Port D
Port registers
Port data registers A and B (PORTA and PORTB)
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INPUT/OUTPUT PORTS
or V
bit 7
SS
).
bit 6
DD
or V
bit 5
SS
bit 4
on the port D pins will result in greater
bit 3
bit 2
bit 1
MC68HC05X16
bit 0
Undefined
Undefined
on reset
State
Rev. 1