MC68HC705C8ACP Freescale Semiconductor, MC68HC705C8ACP Datasheet - Page 79

• Manufacturer Part Number: MC68HC705C8ACP
• Description: IC MCU 4MHZ 8K OTP 40-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705C8ACP

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 24
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: OTP
• Ram Size: 304 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

7.3.2 Data Direction Register A
MC68HC705C8A — Rev. 3
MOTOROLA
NOTE:
Address:
The contents of data direction register A (DDRA) shown in
determine whether each port A pin is an input or an output. Writing a
logic 1 to a DDRA bit enables the output buffer for the associated port A
pin; a logic 0 disables the output buffer. A reset clears all DDRA bits,
configuring all port A pins as inputs.
DDRA7–DDRA0 — Port A Data Direction Bits
Avoid glitches on port A pins by writing to the port A data register before
changing DDRA bits from logic 0 to logic 1.
Reset:
Read:
Write:
These read/write bits control port A data direction. Reset clears bits
DDRA7–DDRA0.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
DDRA7
$0004
Bit 7
0
Figure 7-2. Data Direction Register A (DDRA)
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Parallel Input/Output (I/O)
DDRA6
6
0
DDRA5
5
0
DDRA4
4
0
DDRA3
3
0
DDRA2
Parallel Input/Output (I/O)
2
0
DDRA1
1
0
Figure 7-2
Technical Data
DDRA0
Bit 0
Port A
0
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