HCS412 Datasheet, PDF (35/44 Pages) Microchip Technology – KEELOQ Code Hopping Encoder and Transponder

HCS412
7.1 EEPROM Organization
TABLE 7-1: HCS412 EEPROM ORGANIZATION
16Bit
Word ₁₅
1
2
3
4
5
6
7
8
BITS
14 13 12 11 10 9 8
KEY1_1
KEY1_3
KEY1_5
KEY1_7 (KEY1 MSB)
SEED_1 / KEY2_1
SEED_3 / KEY2_3
SEED_5 / KEY2_5 / TCODE_1
SEED_7 / KEY2_7 /
TCODE_3 (MSB for all 3)
76543210
KEY1_0 (KEY1 LSB)
KEY1_2
KEY1_4
KEY1_6
SEED_0 / KEY2_0 (SEED AND KEY2 LSB)
SEED_2 / KEY2_2
SEED_4 / KEY2_4 / TCODE_0 (TCODE LSB)
SEED_6 / KEY2_6 / TCODE_2
9
RFBSL
10
LFSP
10
OSCT
3210
10
OVR
10bit Discrimination Value
109876543210
11
SER1
SER0
12
SER3
SER2
13
USR0 MSB
USR0 LSB
14
USR1 MSB
USR1 LSB
15
USR2 MSB
USR2 LSB
16
USR3 MSB
USR3 LSB
17
CNT1 (Counter MSB)
CNT0 (Counter LSB)
18
Reserved, set to 0
Reserved, set to 0
TABLE 7-2: PROGRAMMING/VERIFY TIMING REQUIREMENTS
VDD = 5.0V ± 10%, 25° C ± 5 °C
Parameter
Symbol
Min.
Program mode setup time
TPS
2
Hold time 1
TPH1
4.0
Hold time 2
TPH2
50
Bulk Write time
TPBW
4.0
Program delay time
TPROG
4.0
Program cycle time
TWC
50
Clock low time
TCLKL
50
Clock high time
TCLKH
50
Data setup time
TDS
0
Data hold time
TDH
18
Data out valid time
TDV
Hold time
TPHOLD
100
Acknowledge low time
TACKL
800
Acknowledge high time
TACKH
800
Max.
5.0
—
—
—
—
—
—
—
—
—
30
—
—
—
Units
ms
ms
µs
ms
ms
ms
µs
µs
µs
µs
µs
µs
µs
µs
© 2002 Microchip Technology Inc.
Preliminary
DS41099C-page 35