MC68HC11E0CFN3 Freescale Semiconductor, MC68HC11E0CFN3 Datasheet - Page 201

MC68HC11E0CFN3

Manufacturer Part Number
MC68HC11E0CFN3
Description
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68HC11E0CFN3

Cpu Family
HC11
Device Core Size
8b
Frequency (max)
3MHz
Interface Type
SCI/SPI
Program Memory Type
ROMLess
Program Memory Size
Not Required
Total Internal Ram Size
512Byte
# I/os (max)
38
Number Of Timers - General Purpose
8
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
3V
On-chip Adc
8-chx8-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
52
Package Type
PLCC
Lead Free Status / Rohs Status
Not Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC68HC11E0CFN3
Manufacturer:
MOT
Quantity:
119
Part Number:
MC68HC11E0CFN3
0
Part Number:
MC68HC11E0CFN3R2
Manufacturer:
FREESCALE
Quantity:
1 831
Part Number:
MC68HC11E0CFN3R2
Manufacturer:
MOTOROLA
Quantity:
12 234
UPLOAD Utility
UPLOAD Utility
The UPLOAD utility subroutine transfers data from the MCU to a host computer system over the SCI serial
data link.
NOTE
Only EPROM versions of the M68HC11 include this utility.
Verification of EPROM contents is one example of how the UPLOAD utility could be used. Before calling
this program, the Y index register is loaded (by user firmware) with the address of the first data byte to be
uploaded. If a baud rate other than the current SCI baud rate is to be used for the upload process, the
user’s firmware must also write to the baud register. The UPLOAD program sends successive bytes of
data out the SCI transmitter until a reset is issued (the upload loop is infinite).
For a complete commented listing example of the UPLOAD utility, refer to
Listing 3. MC68HC711E9
Bootloader
ROM.
EPROM Programming Utility
The EPROM programming utility is one way of programming data into the internal EPROM of the
MC68HC711E9 MCU. An external 12-V programming power supply is required to program on-chip
EPROM. The simplest way to use this utility program is to bootload a 3-byte program consisting of a single
jump instruction to the start of the PROGRAM utility program ($BF00). The bootloader program sets the
X and Y index registers to default values before jumping to the downloaded program (see [16] at the
bottom of
Figure
3). When the host computer sees the $FF character, data to be programmed into the
EPROM is sent, starting with the character for location $D000. After the last byte to be programmed is
sent to the MC68HC711E9 and the corresponding verification data is returned to the host, the
programming operation is terminated by resetting the MCU.
The number of bytes to be programmed, the first address to be programmed, and the programming time
can be controlled by the user if values other than the default values are desired.
To understand the detailed operation of the EPROM programming utility, refer to
Figure 4
during the
following discussion.
Figure 4
is composed of three interrelated parts. The upper-left portion shows the
flowchart of the PROGRAM utility running in the boot ROM of the MCU. The upper-right portion shows
the flowchart for the user-supplied driver program running in the host computer. The lower portion of
Figure 4
is a timing sequence showing the relationship of operations between the MCU and the host
computer. Reference numbers in the flowcharts in the upper half of
Figure 4
have matching numbers in
the lower half to help the reader relate the three parts of the figure.
The shaded area [1] refers to the software and hardware latency in the MCU leading to the transmission
of a character (in this case, the $FF). The shaded area [2] refers to a similar latency in the host computer
(in this case, leading to the transmission of the first data character to the MCU).
The overall operation begins when the MCU sends the first character ($FF) to the host computer,
indicating that it is ready for the first data character. The host computer sends the first data byte [3] and
enters its main loop. The second data character is sent [4], and the host then waits [5] for the first verify
byte to come back from the MCU.
M68HC11 Bootstrap Mode, Rev. 1.1
Freescale Semiconductor
201

Related parts for MC68HC11E0CFN3