MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 58

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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
4.6
All output ports can emulate ‘open-drain’ outputs. This is achieved by writing a zero to the relevant
output port latch. By toggling the corresponding data direction bit, the port pin will either be an
output zero or tri-state (an input). This is shown diagrammatically in
When using a port pin as an ‘open-drain’ output, certain precautions must be taken in the user
software. If a read-modify-write instruction is used on a port where the ‘open-drain’ is assigned
and the pin at this time is programmed as an input, it will read it as a ‘one’. The read-modify-write
instruction will then write this ‘one’ into the output data latch on the next cycle. This would cause
the ‘open-drain’ pin not to output a ‘zero’ when desired.
Note:
Freescale
4-6
‘Open-drain’ outputs should not be pulled above V
(a)
Other port considerations
VDD
Px0
Read buffer output
Data direction register bit DDRn
(b)
V
DD
DDRn
1
1
0
0
1
1
0
0
A
Figure 4-3 Port logic levels
INPUT/OUTPUT PORTS
‘Open-drain’ output
A
0
1
0
1
0
1
0
1
(c)
tri state
tri state
high
high
low
Y
0
1
Normal operation – tri state
‘Open-drain’
DDRx, bit 0 = 0
Portx, bit 0 = 0
DD
.
Figure
Y
Portx, bit 0 = 0
DDRx, bit 0 = 0
4-3.
MC68HC05B6
Rev. 4.1

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