MC68HC705C8AB Freescale Semiconductor, MC68HC705C8AB Datasheet - Page 87

• Manufacturer Part Number: MC68HC705C8AB
• Description: IC MCU 8K OTP 2.1MHZ 42-SDIP
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705C8AB

• 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: 0°C ~ 70°C
• Package / Case: 42-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

7.5.3 Port C Logic
MC68HC705C8A — Rev. 3
MOTOROLA
NOTE:
Figure 7-9
When a port C pin is programmed as an output, reading the port bit reads
the value of the data latch and not the voltage on the pin. When a port C
pin is programmed as an input, reading the port bit reads the voltage
level on the pin. The data latch can always be written, regardless of the
state of its DDRC bit.
pins.
To avoid excessive current draw, tie all unused input pins to V
or change I/O pins to outputs by writing to DDRC in user code as early
as possible.
1. Hi-Z = high impedance
2. Writing affects data register but does not affect input.
DDRC Bit
Freescale Semiconductor, Inc.
For More Information On This Product,
0
1
READ $0006
WRITE $0006
WRITE $0002
READ $0002
shows port C I/O logic.
Go to: www.freescale.com
I/O Pin Mode
Parallel Input/Output (I/O)
Input, Hi-Z
RESET
Output
Table 7-3. Port C Pin Functions
Figure 7-9. Port C I/O Logic
Table 7-3
(1)
DATA DIRECTION
PORT C DATA
REGISTER C
REGISTER
BIT DDRCx
BIT PCx
Accesses to DDRC
DDRC7–DDRC0
DDRC7–DDRC0
Read/Write
summarizes the operation of the port C
PC7–PC0
Parallel Input/Output (I/O)
Accesses to PORTC
Read
Pin
Technical Data
PC7–PC0
PC7–PC0
DD
Write
or V
PCx
Port C
(2)
SS