MC68HC705C8ACB Freescale Semiconductor, MC68HC705C8ACB Datasheet - Page 87

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MC68HC705C8ACB

Manufacturer Part Number
MC68HC705C8ACB
Description
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68HC705C8ACB

Cpu Family
HC05
Device Core Size
8b
Frequency (max)
2.1MHz
Interface Type
SCI/SPI
Program Memory Type
EPROM
Program Memory Size
8KB
Total Internal Ram Size
304Byte
# I/os (max)
24
Number Of Timers - General Purpose
1
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
3V
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Through Hole
Pin Count
42
Package Type
SPDIP
Lead Free Status / Rohs Status
Not Compliant
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

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