HCS500_15 Datasheet, PDF (29/42 Pages) Microchip Technology – KEELOQ® Code Hopping Decoder

HCS500
9.2.6 LEARN STATUS STRING
TABLE 9-8: LEARN STATUS STRING
Section 9.1 “Standard Operating Conditions”
Symbol
Parameters
Min.
TDHI
Command request time
—
TCLA
Microcontroller command
request time
0.005
TCA
Decoder request
acknowledge time
—
TCLH
Clock high hold time
TCLL
Clock low hold time
0.020
TCLKH
Clock high time
20
TCLKL
Clock low time
20
FCLK
Clock frequency
500
TDS
Data hold time
—
* These parameters are characterized but not tested.
Typ.
Max.
—
500
—
500
—
10
1.2
—
1.2
—
1000
—
1000
—
25000
—
5
9.2.7 ERASE ALL COMMAND
TABLE 9-9: TIMING SPECIFICATION FOR ERASE ALL COMMAND
Section 9.1 “Standard Operating Conditions”
Symbol
Parameters
Min.
Typ.
TERA
Learn command activation time
20
—
TACK
Decoder acknowledge time
20
—
TRESP
Microcontroller acknowledge
response time
20
—
TACK2
Decoder data line low
—
—
* These parameters are characterized but not tested.
Max.
1000
210
1000
10
9.2.8 PROGRAMMING COMMAND
TABLE 9-10: TIMING SPECIFICATION FOR PROGRAMMING COMMAND
Section 9.1 “Standard Operating Conditions”
Symbol
Parameters
Min.
Typ.
TPP1 Command request time
—
—
TPP2 Decoder acknowledge time
—
—
TPP3
Start Command mode to first
command bit
20
—
TPP4 Data line low before tri-stated
—
—
TCLKH Clock high time
20
—
TCLKL Clock low time
20
—
FCLK Clock frequency
500
—
TDS Data hold time
—
—
TCMD Command validate time
—
—
TACK Command acknowledge time
30
—
TWT2 Acknowledge respond time
20
—
TALW Data low after clock low
—
—
* These parameters are characterized but not tested.
Max.
500
1
1000
5
1000
1000
25000
5
10
240
1000
10
Units
ms
ms
s
ms
ms
s
s
Hz
s
Units
s
ms
s
s
Units
ms
ms
s
s
s
s
Hz
s
s
ms
s
s
 2001-2015 Microchip Technology Inc.
DS40000153E-page 29