MC711K4CFNE3 Freescale Semiconductor, MC711K4CFNE3 Datasheet - Page 107
MC711K4CFNE3
Manufacturer Part Number
MC711K4CFNE3
Description
IC MCU 8BIT 24K EPROM 84-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Specifications of MC711K4CFNE3
Core Processor
HC11
Core Size
8-Bit
Speed
3MHz
Connectivity
SCI, SPI
Peripherals
POR, PWM, WDT
Number Of I /o
62
Program Memory Size
24KB (24K x 8)
Program Memory Type
OTP
Eeprom Size
640 x 8
Ram Size
768 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
Lead free / RoHS Compliant
Available stocks
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Part Number:
MC711K4CFNE3
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5.3.1 Power-On Reset (POR)
5.3.2 External Reset (RESET)
5.3.3 Computer Operating Properly (COP) System
M68HC11K Family
MOTOROLA
NOTE:
A positive transition on V
power-up conditions. POR cannot be used to detect drops in power
supply voltages. The CPU delays 4064 internal clock cycles after the
oscillator becomes active to allow the clock generator to stabilize, then
checks the RESET pin. If RESET is at logical 0, the CPU remains in the
reset condition until the RESET pin goes to logical 1.
The CPU distinguishes between internal and external reset conditions
by sensing whether the reset pin rises to a logic 1 in less than two
E-clock cycles after an internal device releases reset. When a reset
condition is sensed, the RESET pin is driven low by an internal device
for four E-clock cycles, then released. Two E-clock cycles later, it is
sampled. If the pin is still held low, the CPU assumes that an external
reset has occurred. If the pin is high, it indicates that the reset was
initiated internally by either the COP system or the clock monitor.
It is not advisable to connect an external resistor capacitor (RC)
power-up delay circuit to the reset pin of M68HC11 devices because the
circuit charge time constant can cause the device to misinterpret the
type of reset that occurred.
The MCU includes a COP system to help protect against software
failures. When the COP is enabled, software periodically reinitializes a
free-running watchdog timer before it times out and resets the system.
Such a system reset indicates that a software error has occurred.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Resets and Interrupts
DD
generates a POR, which is used only for
Resets and Interrupts
Sources of Resets
Technical Data
107
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