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HCS370 Datasheet, PDF (8/36 Pages) Microchip Technology – KEELOQ Code Hopping Encoder
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HCS370
3.0 EEPROM ORGANIZATION
A summary of the HCS370 EEPROM organization is
shown in the three tables below. The address column
shows the starting address of the option, and its length
or bit position. Options larger than 8 bits are stored
with the Most Significant bits at the given address.
Enough consecutive 8-bit blocks are reserved for the
entire option size. Options such as SEED1, which
have a length that is not an exact multiple of 8 bits, is
stored right justified in the reserved space. Additional
smaller options such as SDBT1 may be stored in the
same address as the Most Significant bits.
TABLE 3-1: ENCODER1 OPTIONS (SHIFT = 0)
Symbol Address16:Bits
Description(1)
KEY1
1E: 64 bits Encoder Key
SEED1
14: 60 bits Encoder Seed Value
SYNC1
00: 20 bits
00: 18 bits
Encoder Synchronization Counter (CNTSEL=1)
Encoder Synchronization Counter (CNTSEL=0) plus overflow
SER1
10: 32 bits Encoder Serial Number
DISC1
1C: 10 bits Encoder Discrimination value
MSEL1
1C: ---- 32-- Transmission Modulation Format
Value2
00
Format
PWM
01
Manchester
10
VPWM
11
PPM
HSEL1
1C: ---4 ---- Header Select
4 TE = 0
10 TE = 1
XSER1
1C: --5- ---- Extended Serial Number
28 bits = 0
32 bits = 1
QUEN1
1C: -6-- ---- Queue counter Enable
Disable = 0
Enable = 1
STEN1
1C: 7--- ---- START/STOP Pulse Enable
Disable = 0
Enable = 1
LEDBL1
LEDOS1
3F: -6-- ----
3F: 7--- ----
Low Voltage LED Blink
LED On Time Select(1)
Never = 0
50 ms = 0
Once = 1
100 ms = 1
SDLM1
3C: ---- ---0 Limited Seed
Disable = 0
Enable = 1
SDMD1
3C: ---- --1- Seed Mode
User = 0
Production = 1
SDBT1
SDTM1
14: 7654 ----
3C: ---- 32--
Seed Button Code
Time Before Seed Code Word(1)
Value2
00
Time (s)
0.0
01
0.8
10
1.6
BSEL1
3C: --54 ---- Transmission Baud Rate Select(1)
11
Value2
00
3.2
TE (µs)
100
01
200
10
400
GSEL1
3C: 76-- ---- Guard Time Select(1)
11
Value2
00
800
Time (ms)
2 TE
01
6.4
10
51.2
11
102.4
Note 1: All Timing values vary ±10%.
Reference
Section
3.2.2
3.3
3.2, 3.2.1
3.2.2
3.2, 3.2.1
4.1
4.1
3.2
5.6
4.1
5.3
5.3
3.3
3.3
3.3
3.3
4.1
4.1, 5.2
DS41111D-page 8
Preliminary
2002 Microchip Technology Inc.
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