MC68HC711E20CFN2 Freescale Semiconductor, MC68HC711E20CFN2 Datasheet - Page 277
MC68HC711E20CFN2
Manufacturer Part Number
MC68HC711E20CFN2
Description
IC MCU 20K 2MHZ OTP 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Specifications of MC68HC711E20CFN2
Core Processor
HC11
Core Size
8-Bit
Speed
2MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
38
Program Memory Size
20KB (20K x 8)
Program Memory Type
OTP
Eeprom Size
512 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
52-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Motorola Semiconductor Application Note
M68HC11 Bootstrap Mode
By Jim Sibigtroth, Mike Rhoades, and John Langan
Introduction
© Motorola, Inc., 1999
Austin, Texas
The M68HC11 Family of MCUs (microcontroller units) has a bootstrap
mode that allows a user-defined program to be loaded into the internal
random-access memory (RAM) by way of the serial communications
interface (SCI); the M68HC11 then executes this loaded program. The
loaded program can do anything a normal user program can do as well
as anything a factory test program can do because protected control bits
are accessible in bootstrap mode. Although the bootstrap mode is a
single-chip mode of operation, expanded mode resources are
accessible because the mode control bits can be changed while
operating in the bootstrap mode.
This application note explains the operation and application of the
M68HC11 bootstrap mode. Although basic concepts associated with
this mode are quite simple, the more subtle implications of these
functions require careful consideration. Useful applications of this mode
are overlooked due to an incomplete understanding of bootstrap mode.
Also, common problems associated with bootstrap mode could be
avoided by a more complete understanding of its operation and
implications.
AN1060 — Rev. 1.0
AN1060
by AN1060/D
Rev. 1.0
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