MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 54

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MC68HC705B16CFN

Manufacturer Part Number
MC68HC705B16CFN
Description
IC MCU 2.1MHZ 15K OTP 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC05r
Datasheet

Specifications of MC68HC705B16CFN

Core Processor
HC05
Core Size
8-Bit
Speed
2.1MHz
Connectivity
SCI
Peripherals
POR, WDT
Number Of I /o
32
Program Memory Size
15KB (15K x 8)
Program Memory Type
OTP
Eeprom Size
256 x 8
Ram Size
352 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
52-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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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.
Freescale
4-2
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
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.
buffer
Figure 4-1 Standard I/O port structure
data
O/P
DDRn
DATA
INPUT/OUTPUT PORTS
Table 4-1 I/O pin states
Action of MCU write to/read of data bit
buffer
Input
Output
buffer
I/O
Pin
Output
Input
DDRn
1
1
0
0
DATA
MC68HC05B6
0
1
0
1
I/O Pin
tristate
tristate
Rev. 4.1
0
1

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