MC68HC711P2CFN4 Freescale Semiconductor, MC68HC711P2CFN4 Datasheet - Page 116

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MC68HC711P2CFN4

Manufacturer Part Number
MC68HC711P2CFN4
Description
IC MCU 32K OTP 4MHZ 84-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Datasheet

Specifications of MC68HC711P2CFN4

Core Processor
HC11
Core Size
8-Bit
Speed
4MHz
Connectivity
MI Bus, SCI, SPI
Peripherals
POR, PWM, WDT
Number Of I /o
50
Program Memory Size
32KB (32K x 8)
Program Memory Type
OTP
Eeprom Size
640 x 8
Ram Size
1K 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
84-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Manufacturer
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Price
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Motorola Interconnect Bus (MI BUS)
6.8 Interfacing to MI BUS
Technical Data
Figure 6-4. A typical interface between the MC68HC11P2 and the MI BUS
MCU
V
V
DD
SS
RX
TX
10k¾
Physically the MI BUS consists of only a single wire. In the example
shown in
components are required to connect up the MC68HC11P2 for full
MI BUS operation.
The transistor serves both to drive the MI BUS during the push field and
to protect the MCU TX pin from voltage transients generated in the
wiring. Without the transistor, EMI could damage the TX pin. Similarly,
the input pin (RX) is protected from EMI by clamping it to the MCU supply
rails with two diodes. When a load dump occurs, the zener diode (18V)
is switched on and hence turns the transistor on; this generates the logic
‘0’ state on the MI BUS. After eight time slots (200ms) of continuous ‘0’
state, all devices on the MI BUS will have their outputs disabled.
4.7k¾
Freescale Semiconductor, Inc.
For More Information On This Product,
Motorola Interconnect Bus (MI BUS)
Figure
Go to: www.freescale.com
V
DD
18V
6-4, only a single transistor and a few passive
22k¾
+12V
3.9k¾
10k¾
T1
1.2k¾
V
MC68HC11P2 — Rev 1.0
DD
MI BUS

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