HCS512
KEELOQ® Code Hopping Decoder
FEATURES
DESCRIPTION
Security
The Microchip Technology Inc. HCS512 is a code hopping decoder designed for secure Remote Keyless
Entry (RKE) systems. The HCS512 utilizes the patented KEELOQ code hopping system and high security
learning mechanisms to make this a canned solution
when used with the HCS encoders to implement a unidirectional remote keyless entry system.
•
•
•
•
•
Secure storage of Manufacturer’s Code
Secure storage of transmitter’s keys
Up to four transmitters can be learned
KEELOQ® code hopping technology
Normal and secure learning mechanisms
Operating
•
•
•
•
•
4.0V – 6.0V operation
4 MHz external RC oscillator
Learning indication on LRNOUT
Auto baud rate detection
Power saving SLEEP mode
PACKAGE TYPE
PDIP, SOIC
•
•
•
•
Stand-alone decoder
On-chip EEPROM for transmitter storage
Four binary function outputs–15 functions
18-pin DIP/SOIC package
Typical Applications
•
•
•
•
•
•
•
Automotive remote entry systems
Automotive alarm systems
Automotive immobilizers
Gate and garage openers
Electronic door locks
Identity tokens
Burglar alarm systems
1
18
RFIN
LRNOUT
2
17
NC
NC
3
16
OSCIN
MCLR
4
15
OSCOUT
GND
5
14
VDD
S0
6
13
DATA
S1
7
12
CLK
S2
8
11
SLEEP
S3
9
10
VLOW
HCS512
Other
LRNIN
BLOCK DIAGRAM
RFIN
Reception Register
DECRYPTOR
EEPROM
DATA
CLK
CONTROL
Compatible Encoders
All KEELOQ encoders and transponders configured for
the following setting:
•
•
•
•
•
•
•
PWM modulation format (1/3-2/3)
TE in the range from 100 μs to 400 μs
10 x TE Header
28-bit Serial Number
16-bit Synchronization counter
Discrimination bits equal to Serial Number 8 LSbs
66- to 69-bit length code word.
© 2011 Microchip Technology Inc.
LRNIN
MCLR
SLEEP
OSCIN OSCILLATOR
OUTPUT
S0
S1
S2
CONTROL
S3
VLOW
LRNOUT
The Manufacturer’s Code, transmitter keys, and synchronization information are stored in protected onchip EEPROM. The HCS512 uses the DATA and CLK
inputs to load the Manufacturer’s Code which cannot
be read out of the device.
DS40151E-page 1
HCS512
The HCS512 operates over a wide voltage range of
3.0 volts to 6.0 volts. The decoder employs automatic
baud rate detection which allows it to compensate for
wide variations in transmitter data rate. The decoder
contains sophisticated error checking algorithms to
ensure only valid codes are accepted.
1.0
SYSTEM OVERVIEW
Key Terms
The following is a list of key terms used throughout this
data sheet. For additional information on KEELOQ and
Code Hopping, refer to Technical Brief 3 (TB003).
• RKE - Remote Keyless Entry
• Button Status - Indicates what button input(s)
activated the transmission. Encompasses the 4
button status bits S3, S2, S1 and S0 (Figure 8-2).
• Code Hopping - A method by which a code,
viewed externally to the system, appears to
change unpredictably each time it is transmitted.
• Code word - A block of data that is repeatedly
transmitted upon button activation (Figure 8-1).
• Transmission - A data stream consisting of
repeating code words (Figure 8-1).
• Crypt key - A unique and secret 64-bit number
used to encrypt and decrypt data. In a symmetrical block cipher such as the KEELOQ algorithm,
the encryption and decryption keys are equal and
will therefore be referred to generally as the crypt
key.
• Encoder - A device that generates and encodes
data.
• Encryption Algorithm - A recipe whereby data is
scrambled using a crypt key. The data can only be
interpreted by the respective decryption algorithm
using the same crypt key.
• Decoder - A device that decodes data received
from an encoder.
• Decryption algorithm - A recipe whereby data
scrambled by an encryption algorithm can be
unscrambled using the same crypt key.
• Learn – Learning involves the receiver calculating
the transmitter’s appropriate crypt key, decrypting
the received hopping code and storing the serial
number, synchronization counter value and crypt
key in EEPROM. The KEELOQ product family facilitates several learning strategies to be implemented on the decoder. The following are
examples of what can be done.
- Simple Learning
The receiver uses a fixed crypt key, common
to all components of all systems by the same
manufacturer, to decrypt the received code
word’s encrypted portion.
- Normal Learning
The receiver uses information transmitted
DS40151E-page 2
during normal operation to derive the crypt
key and decrypt the received code word’s
encrypted portion.
- Secure Learn
The transmitter is activated through a special
button combination to transmit a stored 60-bit
seed value used to generate the transmitter’s
crypt key. The receiver uses this seed value
to derive the same crypt key and decrypt the
received code word’s encrypted portion.
• Manufacturer’s code – A unique and secret 64bit number used to generate unique encoder crypt
keys. Each encoder is programmed with a crypt
key that is a function of the manufacturer’s code.
Each decoder is programmed with the manufacturer code itself.
1.1
HCS Encoder Overview
The HCS encoders have a small EEPROM array which
must be loaded with several parameters before use.
The most important of these values are:
• A crypt key that is generated at the time of production
• A 16-bit synchronization counter value
• A 28-bit serial number which is meant to be
unique for every encoder
The manufacturer programs the serial number for each
encoder at the time of production, while the ‘Key Generation Algorithm’ generates the crypt key (Figure 1-1).
Inputs to the key generation algorithm typically consist
of the encoder’s serial number and a 64-bit manufacturer’s code, which the manufacturer creates.
Note:
The manufacturer code is a pivotal part of
the system’s overall security. Consequently, all possible precautions must be
taken and maintained for this code.
© 2011 Microchip Technology Inc.
HCS512
FIGURE 1-1:
CREATION AND STORAGE OF CRYPT KEY DURING PRODUCTION
Production
Programmer
HCS512
Transmitter
Serial Number
EEPROM Array
Serial Number
Crypt Key
Sync Counter
Manufacturer’s
Code
Key
Generation
Algorithm
The 16-bit synchronization counter is the basis behind
the transmitted code word changing for each transmission; it increments each time a button is pressed. Due
to the code hopping algorithm’s complexity, each increment of the synchronization value results in greater
than 50% of the bits changing in the transmitted code
word.
Figure 1-2 shows how the key values in EEPROM are
used in the encoder. Once the encoder detects a button
press, it reads the button inputs and updates the synchronization counter. The synchronization counter and
crypt key are input to the encryption algorithm and the
output is 32 bits of encrypted information. This data will
change with every button press, its value appearing
externally to ‘randomly hop around’, hence it is referred
to as the hopping portion of the code word. The 32-bit
hopping code is combined with the button information
and serial number to form the code word transmitted to
the receiver. The code word format is explained in
greater detail in Section 8.2.
FIGURE 1-2:
.
.
.
Crypt
Key
A receiver may use any type of controller as a decoder,
but it is typically a microcontroller with compatible firmware that allows the decoder to operate in conjunction
with an HCS512 based transmitter. Section 5.0
provides detail on integrating the HCS512 into a system.
A transmitter must first be ‘learned’ by the receiver
before its use is allowed in the system. Learning
includes calculating the transmitter’s appropriate crypt
key, decrypting the received hopping code and storing
the serial number, synchronization counter value and
crypt key in EEPROM.
In normal operation, each received message of valid
format is evaluated. The serial number is used to determine if it is from a learned transmitter. If from a learned
transmitter, the message is decrypted and the synchronization counter is verified. Finally, the button status is
checked to see what operation is requested. Figure 1-3
shows the relationship between some of the values
stored by the receiver and the values received from
the transmitter.
BUILDING THE TRANSMITTED CODE WORD (ENCODER)
EEPROM Array
Crypt Key
Sync Counter
KEELOQ®
Encryption
Algorithm
Serial Number
Button Press
Information
Serial Number
32 Bits
Encrypted Data
Transmitted Information
© 2011 Microchip Technology Inc.
DS40151E-page 3
HCS512
FIGURE 1-3:
BASIC OPERATION OF RECEIVER (DECODER)
1 Received Information
EEPROM Array
Button Press
Information
Serial Number
2
32 Bits of
Encrypted Data
Manufacturer Code
Check for
Match
Serial Number
Sync Counter
Crypt Key
3
KEELOQ®
Decryption
Algorithm
Perform Function
5 Indicated by
button press
Decrypted
Synchronization
Counter
4
Check for
Match
NOTE: Circled numbers indicate the order of execution.
2.0
PIN
PIN ASSIGNMENT
Decoder
Function
I/O (1)
Buffer
Type(1)
Description
1
LRNIN
I
TTL
Learn input - initiates learning, 10K pull-up required on input
2
LRNOUT
O
TTL
Learn output - indicates learning
3
NC
—
TTL
Do not connect
4
MCLR
I
ST
Master clear input
5
Ground
P
—
Ground connection
6
S0
O
TTL
Switch 0
7
S1
O
TTL
Switch 1
8
S2
O
TTL
Switch 2
9
S3
O
TTL
Switch 3
10
VLOW
O
TTL
Battery low indication output
TTL
11
SLEEP
I
12
CLK
I/O
TTL/ST
(2)
Clock in Programming mode and Synchronous mode
Connect to RFIN to allow wake-up from SLEEP
13
DATA
I/O
TTL/ST (2)
Data in Programming mode and Synchronous mode
14
VDD
P
—
Power connection
15
OSCOUT (1MHZ)
O
TTL
Oscillator out (test point)
16
OSCIN (4MHz)
I
ST
Oscillator in – recommended values 4.7 kΩ and 22 pF
17
NC
—
—
18
RFIN
I
TTL
RF input from receiver
Note 1: P = power, I = in, O = out, and ST = Schmitt Trigger input.
2: Pin 12 and Pin 13 have a dual purpose. After RESET, these pins are used to determine if Programming
mode is selected in which case they are the clock and data lines. In normal operation, they are the clock
and data lines of the synchronous data output stream.
DS40151E-page 4
© 2011 Microchip Technology Inc.
HCS512
3.0
DESCRIPTION OF FUNCTIONS
3.1
Parallel Interface
A special status message is transmitted on the second
pass of learn. This allows the controlling microcontroller to determine if the learn was successful (Result
= 1) and if a previous transmitter was overwritten
(Overwrite = 1). The status message is shown in
Figure 3-2.
The HCS512 activates the S3, S2, S1 & S0 outputs
when a new valid code is received. The outputs will be
activated for approximately 500 ms. If a repeated code
is received during this time, the output extends for
approximately 500 ms.
3.2
Table 3-1 show the values for TX1:0 and the number of
transmitters learned.
TABLE 3-1:
Serial Interface
The decoder has a PWM/Synchronous interface connection to microcontrollers with limited I/O. An output
data stream is generated when a valid transmission is
received. The data stream consists of one START bit,
four function bits, one bit for battery status, one bit to
indicate a repeated transmission, two status bits, and
one STOP bit. (Table 3-1). The DATA and CLK lines are
used to send a synchronous event message.
FIGURE 3-1:
START
FIGURE 3-2:
START
STATUS BITS
TX1
TX0
Number of Transmitters
0
0
One
0
1
Two
1
0
Three
1
1
Four
DATA OUTPUT FORMAT
S3
S2
S1
S0
VLOW
REPEAT
TX1
TX0
STOP
RESULT
OVRWR
TX1
TX0
STOP
STATUS MESSAGE FORMAT
0
0
0
0
A 1-wire PWM or 2-wire synchronous interface can be used.
In 1-wire mode, the data is transmitted as a PWM signal with a basic pulse width of 400 μs.
In 2-wire mode, Synchronous mode PWM bits start on the rising edge of the clock, and the bits must be sampled on the
falling edge. The START bit is a ‘1’ and the STOP bit is ‘0’.
FIGURE 3-2:
PWM OUTPUT FORMAT(1)
1/31/3 1/3
LOGIC “1”
LOGIC “0”
1200 μs
600 μs
CLK
DATA
START
S3
S2
S1
S0
VLOW
RPT
Reserved Reserved
STOP
1200 μs
Note:
The Decoder output PWM format logic (“1” / “0”) is reversed with respect of the Encoder modulation format.
© 2011 Microchip Technology Inc.
DS40151E-page 5
HCS512
4.0
DECODER OPERATION
The following checks are performed on the decoder to
determine if the transmission is valid during learn:
4.1
Learning a Transmitter to a
Receiver
•
•
•
•
Either the serial number-based learning method or the
seed-based learning method can be selected. The
learning method is selected in the configuration byte. In
order for a transmitter to be used with a decoder, the
transmitter must first be ‘learned’. When a transmitter is
learned to a decoder, the decoder stores the crypt key,
a check value of the serial number and current synchronization value in EEPROM. The decoder must
keep track of these values for every transmitter that is
learned. The maximum number of transmitters that can
be learned is four. The decoder must also contain the
Manufacturer’s Code in order to learn a transmitter.
The Manufacturer’s Code will typically be the same for
all decoders in a system.
The HCS512 has four memory slots. After an “erase all”
procedure, all the memory slots will be cleared. Erase
all is activated by taking LRNIN low for approximately
10 seconds. When a new transmitter is learned, the
decoder searches for an empty memory slot and stores
the transmitter’s information in that memory slot. When
all memory slots are full, the decoder randomly overwrites existing transmitters.
4.1.1
LEARNING PROCEDURE
Learning is activated by taking the LRNIN input low for
longer than 64 ms. This input requires an external pullup resistor.
To learn a new transmitter to the HCS512 decoder, the
following sequence is required:
1.
2.
3.
4.
5.
6.
Enter Learning mode by pulling LRNIN low for
longer than 64 ms. The LRNOUT output will go
high.
Activate the transmitter until the LRNOUT output goes low indicating reception of a valid code
(hopping message).
Activate the transmitter a second time until the
LRNOUT toggles for 4 seconds (in Secure
Learning mode, the seed transmission must be
transmitted during the second stage of learn by
activating the appropriate buttons on the transmitter).
If LRNIN is taken low momentarily during the
learn status indication, the indication will be terminated. Once a successful learning sequence
is detected, the indication can be terminated
allowing quick learning in a manufacturing
setup.
The transmitter is now learned into the decoder.
Repeat steps 1-4 to learn up to four transmitters.
Learning will be terminated if two non-sequential
codes were received or if two acceptable codes
were not decoded within 30 seconds.
DS40151E-page 6
The first code word is checked for bit integrity.
The second code word is checked for bit integrity.
The hopping code is decrypted.
If all the checks pass, the serial number and synchronization counters are stored in EEPROM
memory.
Figure 4-1 shows a flow chart of the learn sequence.
FIGURE 4-1:
LEARN SEQUENCE
Enter Learn
Mode
Wait for Reception
of a Valid Code
Wait for Reception
of Second
Non-Repeated
Valid Code
Generate Key
from Serial Number
or Seed Value
Use Generated Key
to Decrypt
Compare Discrimination
Value with Serial Number
Equal
?
No
Yes
Learn successful. Store:
Serial number check value
Synchronization counter
crypt key
Learn
Unsuccessful
Exit
© 2011 Microchip Technology Inc.
HCS512
4.2
Validation of Codes
The decoder waits for a transmission and checks the
serial number to determine if the transmitter has been
learned. If learned, the decoder decrypts the encrypted
portion of the transmission using the crypt key. It uses
the discrimination bits to determine if the decryption
was valid. If everything up to this point is valid, the
synchronization value is evaluated.
4.3
Validation Steps
Validation consists of the following steps:
• Search EEPROM to find the Serial Number
Check Value Match
• Decrypt the Hopping Code
• Compare the 10 bits of discrimination value with
the lower 10 bits of serial number
• Check if the synchronization counter falls within
the first synchronization window.
• Check if the synchronization counter falls within
the second synchronization window.
• If a valid transmission is found, update the synchronization counter, else use the next transmitter
block and repeat the tests.
FIGURE 4-2:
DECODER OPERATION
Start
No Transmission
Received
?
Yes
Does
Ser # Check Val
Match
?
Yes
Decrypt Transmission
No
No
Is
Decryption
Valid
?
Yes
Is
Counter
Within 16
?
Yes
Execute
Command
and
Update
Counter
No
No
Is
Counter
Within 32K
?
Yes
Save Counter
in Temp Location
© 2011 Microchip Technology Inc.
DS40151E-page 7
HCS512
4.4
Synchronization with Decoder
(Evaluating the Counter)
The KEELOQ technology patent scope includes a
sophisticated synchronization technique that does not
require the calculation and storage of future codes. The
technique securely blocks invalid transmissions while
providing transparent resynchronization to transmitters
inadvertently activated away from the receiver.
Figure 4-3 shows a 3-partition, rotating synchronization
window. The size of each window is optional but the
technique is fundamental. Each time a transmission is
authenticated, the intended function is executed and
the transmission's synchronization counter value is
stored in EEPROM. From the currently stored counter
value there is an initial "Single Operation" forward window of 16 codes. If the difference between a received
synchronization counter and the last stored counter is
within 16, the intended function will be executed on the
single button press and the new synchronization counter will be stored. Storing the new synchronization
counter value effectively rotates the entire synchronization window.
is referred to as "Double Operation" because a transmission with synchronization counter value in this window will require an additional, sequential counter
transmission prior to executing the intended function.
Upon receiving the sequential transmission the
decoder executes the intended function and stores the
synchronization counter value. This resynchronization
occurs transparently to the user as it is human nature
to press the button a second time if the first was unsuccessful.
The third window is a "Blocked Window" ranging from
the double operation window to the currently stored
synchronization counter value. Any transmission with
synchronization counter value within this window will
be ignored. This window excludes previously used,
perhaps code-grabbed transmissions from accessing
the system.
Note:
A "Double Operation" (resynchronization) window further exists from the Single Operation window up to 32K
codes forward of the currently stored counter value. It
FIGURE 4-3:
SYNCHRONIZATION WINDOW
Entire Window
rotates to eliminate
use of previously
used codes
Blocked
Window
(32K Codes)
Stored
Synchronization
Counter Value
Double Operation
(resynchronization)
Window
(32K Codes)
4.5
SLEEP Mode
The SLEEP mode of the HCS512 is used to reduce
current consumption when no RF input signal is present. SLEEP mode will only be effective in systems
where the RF receiver is relatively quiet when no signal
is present. During SLEEP, the clock stops, thereby significantly reducing the operating current. SLEEP mode
is enabled by the SLEEP bit in the configuration byte.
The HCS512 will enter SLEEP mode when:
• The RF line is low
• After a function output is switched off
• Learn mode is terminated (time-out reached)
DS40151E-page 8
The synchronization method described in
this section is only a typical implementation
and because it is usually implemented in
firmware, it can be altered to fit the needs
of a particular system.
Single Operation
Window
(16 Codes)
The device will not enter SLEEP mode when:
• A function output is active
• Learn sequence active
• Device is in Programming mode
The device will wake-up from SLEEP when:
• The SLEEP input pin changes state
• The CLOCK line changes state
Note:
During SLEEP mode the CLK line will
change from an output line to an input line
that can be used to wake-up the device.
Connect CLK to LRNIN via a 100K resistor
to reliably enter the Learn mode whenever
SLEEP mode is active.
© 2011 Microchip Technology Inc.
HCS512
5.0
INTEGRATING THE HCS512
INTO A SYSTEM
The HCS512 can act as a stand-alone decoder or be
interfaced to a microcontroller. Typical stand-alone
applications include garage door openers and electronic door locks. In stand-alone applications, the
HCS512 will handle learning, reception, decryption,
and validation of the received code; and generate the
appropriate output. For a garage door opener, the
HCS512 input will be connected to an RF receiver, and
the output, to a relay driver to connect a motor controller.
Typical systems where the HCS512 will be connected
to a microcontroller include vehicle and home security
systems. The HCS512 input will be connected to an RF
receiver and the function outputs to the microcontroller.
The HCS512 will handle all the decoding functions and
the microcontroller, all the system functions. The Serial
Output mode with a 1- or 2-wire interface can be used
if the microcontroller is I/O limited.
6.0
DECODER PROGRAMMING
The PG306001 production programmer will allow easy
setup and programming of the configuration byte and
the manufacturer’s code.
6.1
Configuration Byte
The configuration byte is used to set system configuration for the decoder. The LRN bits determine which
algorithm (Decrypt or XOR) is used for the key generation. SC_LRN determines whether normal learn (key
derived from serial number) or secure learn (key
derived from seed value) is used.
TABLE 6-1:
Bit
Name
Description
0
LRN0
Learn algorithm select
1
LRN1
Not used
2
SC_LRN
Secure Learn enable (1 = enabled)
3
SLEEP
SLEEP enable (1 = enabled)
4
RES1
Not used
5
RES2
Not used
6
RES3
Not used
7
RES4
Not used
TABLE 6-2:
© 2011 Microchip Technology Inc.
CONFIGURATION BYTE
LEARN METHOD LRN0, LRN1
DEFINITIONS
LRN0
Description
0
Decrypt algorithm
1
XOR algorithm
DS40151E-page 9
HCS512
6.2
Programming the Manufacturer’s
Code
6.4
The checksum is used by the HCS512 to check that the
data downloaded was correctly received before programming the data. The checksum is calculated so that
the 10 bytes added together (discarding the overflow
bits) is zero. The checksum can be calculated by adding the first 9 bytes of data together and subtracting the
result from zero. Throughout the calculation the overflow is discarded.
The manufacturer’s code must be programmed into
EEPROM memory through the synchronous programming interface using the DATA and CLK lines. Provision
must be made for connections to these pins if the
decoder is going to be programmed in circuit.
Programming mode is activated if the CLK is low for at
least 1 ms and then goes high within 64 ms after powerup, stays high for longer than 8 ms but not longer than
128 ms. After entering Programming mode the 64-bit
manufacturer’s code, 8-bit configuration byte, and 8-bit
checksum is sent to the device using the synchronous
interface. After receiving the 80-bit message the checksum is verified and the information is written to
EEPROM. If the programming operation was successful, the HCS512 will respond with an Acknowledge
pulse.
Given a manufacturer’s code of 0123456789ABCDEF16 and a Configuration Word of 116, the
checksum is calculated as shown in Figure 6-1. The
checksum is 3F16.
6.5
Test Transmitter
The HCS512 decoder will automatically add a test
transmitter each time an Erase All Function is done. A
test transmitter is defined as a transmitter with a serial
number of zero. After an Erase All, the test transmitter
will always work without learning and will not check the
synchronization counter of the transmitter. Learning of
any new transmitters will erase the test transmitter.
After programming the manufacturer’s code, the
HCS512 decoder will automatically activate an
Erase All function, removing all transmitters from the
system.
6.3
Checksum
Download Format
Note 1: A transmitter with a serial number of zero
cannot be learned. Learn will fail after the
first transmission.
The manufacturer’s code and configuration byte must
be downloaded Least Significant Byte, Least Significant bit first as shown in Table 6-3.
2: Always learn at least one transmitter after
an Erase All sequence. This ensures that
the test transmitter is erased.
TABLE 6-3:
DOWNLOAD DATA
Byte 9
Byte 8
Byte 7
Byte 6
Byte 5
Byte 4
Byte 3
Byte 2
Byte 1
Byte 0
Checksum
Config
Man
Key_7
Man
Key_6
Man
Key_5
Man
Key_4
Man
Key_3
Man
Key_2
Man
Key_1
Man
Key_0
Byte 0, right-most bit downloaded first.
FIGURE 6-1:
CHECKSUM CALCULATION
0116 + 2316 = 246
2416 + 4516 = 6916
6916 + 6716 = D016
D016 + 8916 = 15916
5916 + AB16 = 10416 (Carry is discarded)
0416 + CD16 = D116 (Carry is discarded)
D116 + EF16 = 1C016
C016 + 116 = C116 (Carry is discarded)
(FF16 - C116) + 116 = 3F16
DS40151E-page 10
© 2011 Microchip Technology Inc.
HCS512
FIGURE 6-2:
PROGRAMMING WAVEFORMS
MCLR
TPS
TPH1
TCKL
TPH2
TACK
TCKH
TACKH
CLK
(Clock)
DAT
Bit0
(Data)
Enter Program Mode
TABLE 6-4:
Bit1
Bit78
Bit79
Ack
Acknowledge
pulse
80-bit Data Package
PROGRAMMING TIMING REQUIREMENTS
Parameter
Symbol
Min.
Max.
Units
Program mode setup time
TPS
1
64
ms
Hold time 1
TPH1
8
128
ms
Hold time 2
TPH2
0.05
320
ms
Clock High Time
TCKH
0.05
320
ms
Clock Low Time
TCKL
0.050
320
ms
Acknowledge Time
TACK
—
80
ms
Acknowledge duration
TACKH
1
—
ms
Note:
FOSC equals 4 MHz.
© 2011 Microchip Technology Inc.
DS40151E-page 11
HCS512
7.0
KEY GENERATION SCHEMES
The HCS512 decoder has two key generation schemes. Normal learning uses the transmitter’s serial number to derive
two input seeds which are used as inputs to the key generation algorithm. Secure learning uses the seed transmission
to derive the two input seeds. Two key generation algorithms are available to convert the inputs seeds to secret keys.
The appropriate scheme is selected in the Configuration Word.
FIGURE 7-1:
Serial
Number
Patched
Manufacturer’s
Key
Key Generation
Algorithms
------------------Decrypt
XOR
Encoder
Key
Seed
7.1
Normal Learning (Serial Number Derived)
The two input seeds are composed from the serial number in two ways, depending on the encoder type. The encoder
type is determined from the number of bits in the incoming transmission. SourceH is used to calculate the upper 32 bits
of the crypt key, and SourceL, for the lower 32 bits.
For 28-bit serial number encoders (66 / 67-bit transmissions):
SourceH = 6H + 28 bit Serial Number
SourceL = 2H + 28 bit Serial Number
7.2
Secure Learning (Seed Derived)
The two input seeds are composed from the seed value that is transmitted during secure learning. The lower 32 bits of
the seed transmission is used to compose the lower seed, and the upper 32 bits, for the upper seed. The upper 4 bits
(function code) are set to zero.
For 32-bit seed encoders:
SourceH = Serial Number Lower 28 bits (with upper 4 bits always zero)
SourceL = Seed 32 bits
For 48-bit seed encoders:
SourceH = Seed Upper 16 bits + Serial Number Upper 16 bits (with upper 4 bits always zero) << 16
SourceL = Seed Lower 32 bits
For 60-bit seed encoders:
SourceH = Seed Upper 28 bits (with upper 4 bits always zero)
SourceL = Seed Lower 32 bits
DS40151E-page 12
© 2011 Microchip Technology Inc.
HCS512
7.3
Key Generation Algorithms
There are two key generation algorithms implemented in the HCS512 decoder. The KEELOQ decryption algorithm provides a higher level of security than the XOR algorithm. Section 6.1 describes the selection of the algorithms in the configuration byte.
7.3.1
KEELOQ DECRYPT ALGORITHM
This algorithm uses the KEELOQ decryption algorithm and the manufacturer’s code to derive the crypt key as follows:
Key Upper 32 bits = Decrypt (SourceH) 64 Bit Manufacturers Code
Key Lower 32 bits = Decrypt (SourceL) 64 Bit Manufacturers Code
7.3.2
XOR WITH THE MANUFACTURER’S CODE
The two 32-bits seeds are XOR with the manufacturer’s code to form the 64 bit crypt key.
Key Upper 32 bits = SourceH XOR Manufacturers Code Upper 32 bits
Key Lower 32 bits = SourceL XOR Manufacturers Code Lower 32 bits
After programming the manufacturer’s code, the HCS512 decoder will automatically activate an Erase All function,
removing all transmitters from the system.
If LRNIN is taken low momentarily during the learn status indication, the indication will be terminated. Once a successful
learning sequence is detected, the indication can be terminated, allowing quick learning in a manufacturing setup.
FIGURE 7-2:
HCS512 KEY GENERATION
Normal Learn (SC_LRN = 0)
Padding
2
28-bit Serial Number
Padding
6
28-bit Serial Number
KEELOQ®
LS 32 bits of crypt key
Decryption
Algorithm
Secure Learn (SC_LRN = 1)
LS 32 bits of Seed Transmission
Padding
0000b
LRN0 = 0
MS 32 bits of crypt key
LRN0 = 0
KEELOQ
LS 32 bits of crypt key
Decryption
Algorithm
MS 28 bits of Seed Transmission
Secure Learn XOR (SC_LRN = 1)
MS 32 bits of crypt key
LRN0 = 1
LS 32 bits of Seed Transmission
LS 32 bits of crypt key
XOR
Padding
0000b
MS 28 bits of Seed Transmission
© 2011 Microchip Technology Inc.
MS 32 bits of crypt key
DS40151E-page 13
HCS512
8.0
KEELOQ ENCODERS
8.1
Transmission Format (PWM)
and the 28-bit serial number. The encrypted and nonencrypted combined sections increase the number of
combinations to 7.38 x 1019.
The KEELOQ encoder transmission is made up of several parts (Figure 8-1). Each transmission begins with
a preamble and a header, followed by the encrypted
and then the fixed data. The actual data is 66/69 bits
which consists of 32 bits of encrypted data and 34/37
bits of non-encrypted data. Each transmission is followed by a guard period before another transmission
can begin. The encrypted portion provides up to four
billion changing code combinations and includes the
button status bits (based on which buttons were activated) along with the synchronization counter value
and some discrimination bits. The non-encrypted portion is comprised of the status bits, the function bits,
FIGURE 8-1:
8.2
Code Word Organization
The HCSXXX encoder transmits a 66/69-bit code word
when a button is pressed. The 66/69-bit word is constructed from an encryption portion and a nonencrypted code portion (Figure 8-2).
The Encrypted Data is generated from four button bits,
two overflow counter bits, ten discrimination bits, and
the 16-bit synchronization value.
The Non-encrypted Data is made up from 2 status
bits, 4 function bits, and the 28/32-bit serial number.
TRANSMISSION FORMAT (PWM)
TE
TE
TE
LOGIC "0"
LOGIC "1"
TBP
50% Preamble
FIGURE 8-2:
10xTE
Header
Fixed Code
Portion
Guard
Time
CODE WORD ORGANIZATION
34 bits of Fixed Portion
Repeat VLOW
(1-bit) (1-bit)
MSb
Button
Status
S2 S1 S0 S3
Serial Number
(28 bits)
32 bits of Encrypted Portion
Button
Status
S2 S1 S0 S3
OVR
DISC
(2 bits) (10 bits)
Sync Counter
(16 bits)
66 Data bits
Transmitted
LSb first.
Repeat VLOW
(1-bit) (1-bit)
MSb
Encrypted
Portion
Button
Status
1 1 1 1
Serial Number
(28 bits)
SEED
(32 bits)
SEED replaces Encrypted Portion when all button inputs are activated at the same time.
DS40151E-page 14
LSb
LSb
© 2011 Microchip Technology Inc.
HCS512
9.0
DEVELOPMENT SUPPORT
The PIC® microcontrollers and dsPIC® digital signal
controllers are supported with a full range of software
and hardware development tools:
• Integrated Development Environment
- MPLAB® IDE Software
• Compilers/Assemblers/Linkers
- MPLAB C Compiler for Various Device
Families
- HI-TECH C for Various Device Families
- MPASMTM Assembler
- MPLINKTM Object Linker/
MPLIBTM Object Librarian
- MPLAB Assembler/Linker/Librarian for
Various Device Families
• Simulators
- MPLAB SIM Software Simulator
• Emulators
- MPLAB REAL ICE™ In-Circuit Emulator
• In-Circuit Debuggers
- MPLAB ICD 3
- PICkit™ 3 Debug Express
• Device Programmers
- PICkit™ 2 Programmer
- MPLAB PM3 Device Programmer
• Low-Cost Demonstration/Development Boards,
Evaluation Kits, and Starter Kits
9.1
MPLAB Integrated Development
Environment Software
The MPLAB IDE software brings an ease of software
development previously unseen in the 8/16/32-bit
microcontroller market. The MPLAB IDE is a Windows®
operating system-based application that contains:
• A single graphical interface to all debugging tools
- Simulator
- Programmer (sold separately)
- In-Circuit Emulator (sold separately)
- In-Circuit Debugger (sold separately)
• A full-featured editor with color-coded context
• A multiple project manager
• Customizable data windows with direct edit of
contents
• High-level source code debugging
• Mouse over variable inspection
• Drag and drop variables from source to watch
windows
• Extensive on-line help
• Integration of select third party tools, such as
IAR C Compilers
The MPLAB IDE allows you to:
• Edit your source files (either C or assembly)
• One-touch compile or assemble, and download to
emulator and simulator tools (automatically
updates all project information)
• Debug using:
- Source files (C or assembly)
- Mixed C and assembly
- Machine code
MPLAB IDE supports multiple debugging tools in a
single development paradigm, from the cost-effective
simulators, through low-cost in-circuit debuggers, to
full-featured emulators. This eliminates the learning
curve when upgrading to tools with increased flexibility
and power.
© 2011 Microchip Technology Inc.
DS40151E-page 15
HCS512
9.2
MPLAB C Compilers for Various
Device Families
The MPLAB C Compiler code development systems
are complete ANSI C compilers for Microchip’s PIC18,
PIC24 and PIC32 families of microcontrollers and the
dsPIC30 and dsPIC33 families of digital signal controllers. These compilers provide powerful integration
capabilities, superior code optimization and ease of
use.
For easy source level debugging, the compilers provide
symbol information that is optimized to the MPLAB IDE
debugger.
9.3
HI-TECH C for Various Device
Families
The HI-TECH C Compiler code development systems
are complete ANSI C compilers for Microchip’s PIC
family of microcontrollers and the dsPIC family of digital
signal controllers. These compilers provide powerful
integration capabilities, omniscient code generation
and ease of use.
For easy source level debugging, the compilers provide
symbol information that is optimized to the MPLAB IDE
debugger.
The compilers include a macro assembler, linker, preprocessor, and one-step driver, and can run on multiple
platforms.
9.4
MPASM Assembler
The MPASM Assembler is a full-featured, universal
macro assembler for PIC10/12/16/18 MCUs.
The MPASM Assembler generates relocatable object
files for the MPLINK Object Linker, Intel® standard HEX
files, MAP files to detail memory usage and symbol
reference, absolute LST files that contain source lines
and generated machine code and COFF files for
debugging.
The MPASM Assembler features include:
9.5
MPLINK Object Linker/
MPLIB Object Librarian
The MPLINK Object Linker combines relocatable
objects created by the MPASM Assembler and the
MPLAB C18 C Compiler. It can link relocatable objects
from precompiled libraries, using directives from a
linker script.
The MPLIB Object Librarian manages the creation and
modification of library files of precompiled code. When
a routine from a library is called from a source file, only
the modules that contain that routine will be linked in
with the application. This allows large libraries to be
used efficiently in many different applications.
The object linker/library features include:
• Efficient linking of single libraries instead of many
smaller files
• Enhanced code maintainability by grouping
related modules together
• Flexible creation of libraries with easy module
listing, replacement, deletion and extraction
9.6
MPLAB Assembler, Linker and
Librarian for Various Device
Families
MPLAB Assembler produces relocatable machine
code from symbolic assembly language for PIC24,
PIC32 and dsPIC devices. MPLAB C Compiler uses
the assembler to produce its object file. The assembler
generates relocatable object files that can then be
archived or linked with other relocatable object files and
archives to create an executable file. Notable features
of the assembler include:
•
•
•
•
•
•
Support for the entire device instruction set
Support for fixed-point and floating-point data
Command line interface
Rich directive set
Flexible macro language
MPLAB IDE compatibility
• Integration into MPLAB IDE projects
• User-defined macros to streamline
assembly code
• Conditional assembly for multi-purpose
source files
• Directives that allow complete control over the
assembly process
DS40151E-page 16
© 2011 Microchip Technology Inc.
HCS512
9.7
MPLAB SIM Software Simulator
The MPLAB SIM Software Simulator allows code
development in a PC-hosted environment by simulating the PIC® MCUs and dsPIC® DSCs on an instruction
level. On any given instruction, the data areas can be
examined or modified and stimuli can be applied from
a comprehensive stimulus controller. Registers can be
logged to files for further run-time analysis. The trace
buffer and logic analyzer display extend the power of
the simulator to record and track program execution,
actions on I/O, most peripherals and internal registers.
The MPLAB SIM Software Simulator fully supports
symbolic debugging using the MPLAB C Compilers,
and the MPASM and MPLAB Assemblers. The software simulator offers the flexibility to develop and
debug code outside of the hardware laboratory environment, making it an excellent, economical software
development tool.
9.8
MPLAB REAL ICE In-Circuit
Emulator System
MPLAB REAL ICE In-Circuit Emulator System is
Microchip’s next generation high-speed emulator for
Microchip Flash DSC and MCU devices. It debugs and
programs PIC® Flash MCUs and dsPIC® Flash DSCs
with the easy-to-use, powerful graphical user interface of
the MPLAB Integrated Development Environment (IDE),
included with each kit.
The emulator is connected to the design engineer’s PC
using a high-speed USB 2.0 interface and is connected
to the target with either a connector compatible with incircuit debugger systems (RJ11) or with the new highspeed, noise tolerant, Low-Voltage Differential Signal
(LVDS) interconnection (CAT5).
The emulator is field upgradable through future firmware
downloads in MPLAB IDE. In upcoming releases of
MPLAB IDE, new devices will be supported, and new
features will be added. MPLAB REAL ICE offers
significant advantages over competitive emulators
including low-cost, full-speed emulation, run-time
variable watches, trace analysis, complex breakpoints, a
ruggedized probe interface and long (up to three meters)
interconnection cables.
© 2011 Microchip Technology Inc.
9.9
MPLAB ICD 3 In-Circuit Debugger
System
MPLAB ICD 3 In-Circuit Debugger System is Microchip's most cost effective high-speed hardware
debugger/programmer for Microchip Flash Digital Signal Controller (DSC) and microcontroller (MCU)
devices. It debugs and programs PIC® Flash microcontrollers and dsPIC® DSCs with the powerful, yet easyto-use graphical user interface of MPLAB Integrated
Development Environment (IDE).
The MPLAB ICD 3 In-Circuit Debugger probe is connected to the design engineer's PC using a high-speed
USB 2.0 interface and is connected to the target with a
connector compatible with the MPLAB ICD 2 or MPLAB
REAL ICE systems (RJ-11). MPLAB ICD 3 supports all
MPLAB ICD 2 headers.
9.10
PICkit 3 In-Circuit Debugger/
Programmer and
PICkit 3 Debug Express
The MPLAB PICkit 3 allows debugging and programming of PIC® and dsPIC® Flash microcontrollers at a
most affordable price point using the powerful graphical
user interface of the MPLAB Integrated Development
Environment (IDE). The MPLAB PICkit 3 is connected
to the design engineer's PC using a full speed USB
interface and can be connected to the target via an
Microchip debug (RJ-11) connector (compatible with
MPLAB ICD 3 and MPLAB REAL ICE). The connector
uses two device I/O pins and the reset line to implement in-circuit debugging and In-Circuit Serial Programming™.
The PICkit 3 Debug Express include the PICkit 3, demo
board and microcontroller, hookup cables and CDROM
with user’s guide, lessons, tutorial, compiler and
MPLAB IDE software.
DS40151E-page 17
HCS512
9.11
PICkit 2 Development
Programmer/Debugger and
PICkit 2 Debug Express
The PICkit™ 2 Development Programmer/Debugger is
a low-cost development tool with an easy to use interface for programming and debugging Microchip’s Flash
families of microcontrollers. The full featured
Windows® programming interface supports baseline
(PIC10F,
PIC12F5xx,
PIC16F5xx),
midrange
(PIC12F6xx, PIC16F), PIC18F, PIC24, dsPIC30,
dsPIC33, and PIC32 families of 8-bit, 16-bit, and 32-bit
microcontrollers, and many Microchip Serial EEPROM
products. With Microchip’s powerful MPLAB Integrated
Development Environment (IDE) the PICkit™ 2
enables in-circuit debugging on most PIC® microcontrollers. In-Circuit-Debugging runs, halts and single
steps the program while the PIC microcontroller is
embedded in the application. When halted at a breakpoint, the file registers can be examined and modified.
The PICkit 2 Debug Express include the PICkit 2, demo
board and microcontroller, hookup cables and CDROM
with user’s guide, lessons, tutorial, compiler and
MPLAB IDE software.
9.12
MPLAB PM3 Device Programmer
The MPLAB PM3 Device Programmer is a universal,
CE compliant device programmer with programmable
voltage verification at VDDMIN and VDDMAX for
maximum reliability. It features a large LCD display
(128 x 64) for menus and error messages and a modular, detachable socket assembly to support various
package types. The ICSP™ cable assembly is included
as a standard item. In Stand-Alone mode, the MPLAB
PM3 Device Programmer can read, verify and program
PIC devices without a PC connection. It can also set
code protection in this mode. The MPLAB PM3
connects to the host PC via an RS-232 or USB cable.
The MPLAB PM3 has high-speed communications and
optimized algorithms for quick programming of large
memory devices and incorporates an MMC card for file
storage and data applications.
DS40151E-page 18
9.13
Demonstration/Development
Boards, Evaluation Kits, and
Starter Kits
A wide variety of demonstration, development and
evaluation boards for various PIC MCUs and dsPIC
DSCs allows quick application development on fully functional systems. Most boards include prototyping areas for
adding custom circuitry and provide application firmware
and source code for examination and modification.
The boards support a variety of features, including LEDs,
temperature sensors, switches, speakers, RS-232
interfaces, LCD displays, potentiometers and additional
EEPROM memory.
The demonstration and development boards can be
used in teaching environments, for prototyping custom
circuits and for learning about various microcontroller
applications.
In addition to the PICDEM™ and dsPICDEM™ demonstration/development board series of circuits, Microchip
has a line of evaluation kits and demonstration software
for analog filter design, KEELOQ® security ICs, CAN,
IrDA®, PowerSmart battery management, SEEVAL®
evaluation system, Sigma-Delta ADC, flow rate
sensing, plus many more.
Also available are starter kits that contain everything
needed to experience the specified device. This usually
includes a single application and debug capability, all
on one board.
Check the Microchip web page (www.microchip.com)
for the complete list of demonstration, development
and evaluation kits.
© 2011 Microchip Technology Inc.
HCS512
10.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Ambient temperature under bias.............................................................................................................-55°C to +125°C
Storage temperature ...............................................................................................................................-65°C to +150°C
Voltage on any pin with respect to VSS (except VDD) ............................................................................ -0.6V to VDD +0.6V
Voltage on VDD with respect to Vss ....................................................................................................................0 to +7.5V
Total power dissipation (Note 1) ..........................................................................................................................800 mW
Maximum current out of VSS pin.............................................................................................................................150 mA
Maximum current into VDD pin................................................................................................................................100 mA
Input clamp current, Iik (VI < 0 or VI > VDD) ............................................................................................................± 20 mA
Output clamp current, IOK (VO < 0 or VO >VDD) ....................................................................................................± 20 mA
Maximum output current sunk by any I/O pin..........................................................................................................25 mA
Maximum output current sourced by any I/O pin ....................................................................................................20 mA
Note:
Power dissipation is calculated as follows: Pdis = VDD x {IDD - ∑IOH} + ∑{(VDD–VOH) x IOH} + ∑(VOl x IOL)
† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at those or any other conditions above
those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
© 2011 Microchip Technology Inc.
DS40151E-page 19
HCS512
TABLE 10-1:
DC CHARACTERISTICS
Standard Operating Conditions (unless otherwise stated)
Operating temperature
Commercial (C):
0° C ≤TA ≤+70° C for commercial
Industrial (I):
-40° C ≤TA ≤+85° C for industrial
Symbol
Characteristic
Min
Typ(†)
Max
Units
VDD
Supply Voltage
4.0
—
6.0
V
VPOR
VDD start voltage to
ensure RESET
—
VSS
—
V
SVDD
VDD rise rate to
ensure RESET
0.05*
—
—
V/ms
IDD
Supply Current
—
—
1.8
7.3
15
4.5
10
32
mA
mA
μA
Conditions
FOSC = 4 MHz, VDD = 5.5V
(During EEPROM programming)
In SLEEP mode
VIL
Input Low Voltage
VSS
—
0.16 VDD
V
except MCLR = 0.2 VDD
VIH
Input High Voltage
0.48 VDD
—
VDD
V
except MCLR = 0.85 VDD
VOL
Output Low Voltage
—
—
0.6
V
IOL = 8.5 mA, VDD = 4.5V
VOH
Output High Voltage
VDD-0.7
—
—
V
IOH = -3.0 mA, VDD = 4.5V
† Data in “Typ” column is at 5.0V, 25° C unless otherwise stated. These parameters are for design guidance only
and are not tested.
* These parameters are characterized but not tested.
Note:
Negative current is defined as coming out of the pin.
TABLE 10-2:
AC CHARACTERISTICS
Symbol
Characteristic
Min
Typ
Max
Units
Conditions
FOSC
Oscillator frequency
2.7
4
6.21
MHz
REXT = 10K, CEXT = 10 pF
65
—
1080
μs
TE
PWM elemental
pulse width
4.5V < VDD < 5.5V
Oscillator components tolerance < 6%.
130
—
1080
μs
3V < VDD < 6V
Oscillator components tolerance <10%
TOD
Output delay
70
90
115
ms
TA
Output activation time
322
500
740
ms
TRPT
REPEAT activation time
TLRN
TMCLR
TOV
*
LRNIN
32
50
74
ms
activation time
21
32
—
ms
low time
150
—
—
ns
—
150
222
ms
MCLR
Time output valid
These parameters are characterized but not tested.
DS40151E-page 20
© 2011 Microchip Technology Inc.
HCS512
FIGURE 10-1: RESET WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER TIMING
VDD
MCLR
TMCLR
TOV
I/O Pins
© 2011 Microchip Technology Inc.
DS40151E-page 21
DS40151E-page 22
0s
TOD
TA
TA
Note 2
1s
2: Output is activated if battery low (VLOW) is detected.
Note 1: Output is activated as long as code is received.
LRNOUT
VLOW
S[3,2,1,0]
RFIN
1 Code Word 50 ms
2s
Note 1
3s
4s
5s
HCS512
FIGURE 10-2: OUTPUT ACTIVATION
© 2011 Microchip Technology Inc.
VDD
VI
N
D
G
© 2011 Microchip Technology Inc.
22 pF
4.7K
VO
P2
15
HCS512
OSCOUT
16 OSCIN
3 NC
4 MCLR
10K
N
D
5
G
D
D
V
VDD
SLEEP
CLK
DAT
VLOW
S0
S1
S2
S3
NC
RFIN
LRNIN
LRNOUT
14
LOW VOLTAGE DETECTOR—DO NOT OMIT
MCP100-450
6
7
8
9
10
11
12
13
17
18
1
2
P4
100K
P3
100 μF
POWER SUPPLY
1N4004/7
1 RECEIVE DATA INPUT
2
3
1
LEARN
BUTTON
10K
VDD
GND
12V
1K
1K
1K
100 μF
VDD
P1
GND
In-Circuit
Programming Pads
P2
P4
VLOW
S3
S2
S1
S0
LRNOUT
RESET
VO
P3
DATA
N
D
G
CLOCK
1K
1K
1K
VI
LM7805
HCS512
FIGURE 10-3: TYPICAL DECODER APPLICATION CIRCUIT
DS40151E-page 23
HCS512
11.0
PACKAGING INFORMATION
11.1
Package Marking Information
18-Lead PDIP
Example
XXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXX
YYWWNNN
18-Lead SOIC
0110017
Example
XXXXXXXXXXXX
XXXXXXXXXXXX
XXXXXXXXXXXX
YYWWNNN
HCS512
/SO
0110017
Legend:
Note:
*
HCS512
XX...X
Y
YY
WW
NNN
Customer specific information*
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line thus limiting the number of available characters
for customer specific information.
Standard PIC MCU device marking consists of Microchip part number, year code, week code, and
traceability code. For PIC MCU device marking beyond this, certain price adders apply. Please check
with your Microchip Sales Office. For QTP devices, any special marking adders are included in QTP
price.
DS40151E-page 24
© 2011 Microchip Technology Inc.
HCS512
11.2
Package Details
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© 2011 Microchip Technology Inc.
DS40151E-page 25
HCS512
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS40151E-page 26
© 2011 Microchip Technology Inc.
HCS512
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
© 2011 Microchip Technology Inc.
DS40151E-page 27
HCS512
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS40151E-page 28
© 2011 Microchip Technology Inc.
HCS512
APPENDIX A:
ADDITIONAL
INFORMATION
Microchip’s Secure Data Products are covered by
some or all of the following:
Code hopping encoder patents issued in European
countries and U.S.A.
Secure learning patents issued in European countries,
U.S.A. and R.S.A.
© 2011 Microchip Technology Inc.
REVISION HISTORY
Revision E (June 2011)
• Updated the following sections: Development Support, The Microchip Web Site, Reader Response
and HCS512 Product Identification System
• Added new section Appendix A
• Minor formatting and text changes were incorporated
throughout the document
DS40151E-page 29
HCS512
THE MICROCHIP WEB SITE
CUSTOMER SUPPORT
Microchip provides online support via our WWW site at
www.microchip.com. This web site is used as a means
to make files and information easily available to
customers. Accessible by using your favorite Internet
browser, the web site contains the following
information:
Users of Microchip products can receive assistance
through several channels:
• Product Support – Data sheets and errata,
application notes and sample programs, design
resources, user’s guides and hardware support
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Customers
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support. Local sales offices are also available to help
customers. A listing of sales offices and locations is
included in the back of this document.
Technical support is available through the web site
at: http://microchip.com/support
CUSTOMER CHANGE NOTIFICATION
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Microchip’s customer notification service helps keep
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specified product family or development tool of interest.
To register, access the Microchip web site at
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registration instructions.
DS40151E-page 30
© 2011 Microchip Technology Inc.
HCS512
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip
product. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our
documentation can better serve you, please FAX your comments to the Technical Publications Manager at
(480) 792-4150.
Please list the following information, and use this outline to provide us with your comments about this document.
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Device: HCS512
Literature Number: DS40151E
Questions:
1. What are the best features of this document?
2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this document easy to follow? If not, why?
4. What additions to the document do you think would enhance the structure and subject?
5. What deletions from the document could be made without affecting the overall usefulness?
6. Is there any incorrect or misleading information (what and where)?
7. How would you improve this document?
© 2011 Microchip Technology Inc.
DS40151E-page 31
HCS512
HCS512 PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
HCS512
—
/P
Package:
Temperature
Range:
Device:
DS40151E-page 32
P = Plastic DIP (300 mil Body), 18-lead
SO = Plastic SOIC (300 mil Body), 18-lead
Blank = 0°C to +70°C
I = -40°C to +85°C
HCS512
HCS512T
Code Hopping Decoder
Code Hopping Decoder (Tape and Reel)
© 2011 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
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hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
PIC32 logo, rfPIC and UNI/O are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified
logo, MPLIB, MPLINK, mTouch, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance,
TSHARC, UniWinDriver, WiperLock and ZENA are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2011, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 978-1-61341-223-7
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
© 2011 Microchip Technology Inc.
DS40151E-page 33
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DS40151E-page 34
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05/02/11
© 2011 Microchip Technology Inc.