MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 56

• 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
Table 4-1
that the read/write signal shown is internal and not available to the user.
4.2
These ports are standard M68HC05 bidirectional I/O ports, each comprising a data register and a
data direction register.
Reset does not affect the state of the data register, but clears the data direction register, thereby
returning all port pins to input mode. Writing a ‘1’ to any DDR bit sets the corresponding port pin
to output mode.
Wired-OR interrupts are provided on all pins of port B. If WOIE is enabled, any combination of high
logic levels on port B pins which are programmed as inputs will trigger an external interrupt. See
Section
10.2.3.2.
shows the effect of reading from or writing to an I/O pin in various circumstances. Note
R/W
0
0
1
1
Data direction
Latched data
Ports A and B
register bit
register bit
DDRn
Freescale Semiconductor, Inc.
0
1
0
1
The I/O pin is in input mode. Data is written into the output data latch.
Data is written into the output data latch, and output to the I/O pin.
The state of the I/O pin is read.
The I/O pin is in output mode. The output data latch is read.
For More Information On This Product,
buffer
Figure 4-1 Standard I/O port structure
data
O/P
DDRn
DATA
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INPUT/OUTPUT PORTS
Table 4-1 I/O pin states
Action of MCU write to/read of data bit
buffer
Input
Output
buffer
Pin
I/O
Output
Input
DDRn
1
1
0
0
MC68HC05X16
DATA
0
1
0
1
I/O Pin
tristate
tristate
0
1
Rev. 1