MC68HC11E1CFNE2 Freescale Semiconductor, MC68HC11E1CFNE2 Datasheet - Page 196

IC MCU 8BIT 3MHZ 52-PLCC

MC68HC11E1CFNE2

Manufacturer Part Number
MC68HC11E1CFNE2
Description
IC MCU 8BIT 3MHZ 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Datasheets

Specifications of MC68HC11E1CFNE2

Core Processor
HC11
Core Size
8-Bit
Speed
3MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
38
Program Memory Type
ROMless
Eeprom Size
512 x 8
Ram Size
512 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
A/d Inputs
8-Channel, 8-Bit
Eeprom Memory
512 Bytes
Input Output
38
Interface
SCI/SPI
Memory Type
ROM
Number Of Bits
8
Package Type
52-pin PLCC
Programmable Memory
0 Bytes
Timers
3-16-bit
Voltage, Range
3-5.5 V
Controller Family/series
68HC11
No. Of I/o's
38
Eeprom Memory Size
512Byte
Ram Memory Size
512Byte
Cpu Speed
2MHz
No. Of Timers
1
Embedded Interface Type
SCI, SPI
Rohs Compliant
Yes
Processor Series
HC11E
Core
HC11
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
SCI, SPI
Maximum Clock Frequency
2 MHz
Number Of Programmable I/os
38
Number Of Timers
8
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
8 bit, 8 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Program Memory Size
-
Lead Free Status / Rohs Status
RoHS Compliant part

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Boot ROM Firmware
The alternate vector locations are achieved by simply driving address bit A14 low during all vector fetches
if SMOD = 1. For special test mode, the alternate vector locations assure that the reset vector can be
fetched from external memory space so the test system can control MCU operation. In special bootstrap
mode, the small boot ROM is enabled in the memory map by RBOOT = 1 so the reset vector will be
fetched from this ROM and the bootloader firmware will control MCU operation.
RBOOT is reset to 1 in bootstrap mode to enable the small boot ROM. In the other three modes, RBOOT
is reset to 0 to keep the boot ROM out of the memory map. While in special test mode, SMOD = 1, which
allows the RBOOT control bit to be written to 1 by software to enable the boot ROM for testing purposes.
Boot ROM Firmware
The main program in the boot ROM is the bootloader, which is automatically executed as a result of
resetting the MCU in bootstrap mode. Some newer versions of the M68HC11 Family have additional utility
programs that can be called from a downloaded program. One utility is available to program EPROM or
OTP versions of the M68HC11. A second utility allows the contents of memory locations to be uploaded
to a host computer. In the MC68HC711K4 boot ROM, a section of code is used by Freescale for stress
testing the on-chip EEPROM. These test and utility programs are similar to self-test ROM programs in
other MCUs except that the boot ROM does not use valuable space in the normal memory map.
Bootstrap firmware is also involved in an optional EEPROM security function on some versions of the
M68HC11. This EEPROM security feature prevents a software pirate from seeing what is in the on-chip
EEPROM. The secured state is invoked by programming the no security (NOSEC) EEPROM bit in the
CONFIG register. Once this NOSEC bit is programmed to 0, the MCU will ignore the mode A pin and
always come out of reset in normal single-chip mode or special bootstrap mode, depending on the state
of the mode B pin. Normal single-chip mode is the usual way a secured part would be used. Special
bootstrap mode is used to disengage the security function (only after the contents of EEPROM and RAM
have been erased). Refer to the M68HC11 Reference Manual, Freescale document order number
M68HC11RM/AD, for additional information on the security mode and complete listings of the boot ROMs
that support the EEPROM security functions.
Automatic Selection of Baud Rate
The bootloader program in the MC68HC711E9 accommodates either of two baud rates.
196
The higher of these baud rates (7812 baud at a 2-MHz E-clock rate) is used in systems that operate
from a binary frequency crystal such as 2
rate is 8192 baud, which was used extensively in automotive applications.
The second baud rate available to the M68HC11 bootloader is 1200 baud at a 2-MHz E-clock rate.
Some of the newest versions of the M68HC11, including the MC68HC11F1 and MC68HC117K4,
accommodate other baud rates using the same differentiation technique explained here. Refer to
the reference numbers in square brackets in
Software can change some aspects of the memory map after reset.
M68HC11 Bootstrap Mode, Rev. 1.1
23
NOTE
Hz (8.389 MHz). At this crystal frequency, the baud
Figure 2
during the following explanation.
Freescale Semiconductor

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