參數(shù)資料
型號(hào)： HCS412TSN
廠商： Microchip Technology Inc.
英文描述： KEELOQ Code Hopping Encoder and Transponder
中文描述： 而Keeloq跳碼編碼器和轉(zhuǎn)發(fā)器
文件頁(yè)數(shù)： 24/44頁(yè)
文件大小： 704K
代理商： HCS412TSN
HCS412
DS41099C-page 24
Preliminary
2002 Microchip Technology Inc.
4.3.4
BULK ERASE
A Bulk Erase resets the HCS412
’s memory map to all
zeros. The transponder reader selects the appropriate
device through anticollision, as need be, issues the
PROGRAM
command followed by the device’s 28-bit
transport code, then resets the device by removing the
field for 100 ms.
Resetting the device after the
PROGRAM
command
results in a bulk erase, resetting the EEPROM memory
map to all zeros. This is important to remember as the
reader must now communicate to the device using the
communication options resulting from a zero’d configu-
ration word - baud rates, modulation format, etc.
(Table 5-1).
FIGURE 4-7:
BULK ERASE
4.3.5
PROGRAM
Inductive programming a HCS412 begins with a bulk
erase sequence (Section 4.3.4), followed by issuing
the
PROGRAM
command and the desired EEPROM
memory map’s 18x16-bit words (Section 5.0). The
HCS412 will send a write Acknowledge after each word
has been successfully written, indicating the device is
ready to receive the next 16-bit word.
After a complete 18 word memory map has been
received and written, the HCS412 PPM modulates 18
bursts of 16-bit words on the LC pins for write verifica-
tion. Each word follows the standard HCS412 response
format with a leading 1LF
TE
low START pulse and ‘01b’
preamble (Figure 4-10).
Since the bulk erase resets the configuration options to
all zeros, the oscillator tuning value will also be cleared.
The correct tuning value is required when the program-
ming sequence sends the new configuration word. The
value may either be obtained by reading the configura-
tion word prior to bulk erase to extract the value or by
determining T
E
from the field Acknowledge sequence
and calculating the tuning value appropriately
(Section 4.2.1).
TABLE 4-6:
PROGRAM COMMANDS
FIGURE 4-8:
PROGRAM SEQUENCE - FIRST WORD
Tr28-bit
Code
0
0
0
1
0
100ms
Program
Command
T
OTD
Communication from reader to HCS412
Communication from HCS412 to reader
Start
2 LF
TE
Start
2 LF
TE
ACK
6ms
T
PU
T
ATO
Activate
Field
ACK
Delay to
Command
Command
Delay to
TCODE
Tr28-bit
Code
Delay
Device Reset
L
M
L
M
Command
Description
Expected data In
Response
01000
Program HCS412 EEPROM
Transport code (28 bits); Com-
plete memory map: 18 x 16-bit
words (288 bits)
Write Acknowledge pulse after
each 16-bit word, 288 bits trans-
mitted in 18 bursts of 16-bit words
Activate
Field
ACK
Delay to
Command
Command
Delay to
TCODE
Tr28-bit
Code
Write ACK
Delay before Write
ACK
Delay to
Data
16 bits Data
Repeat 18 times for programming
Tr28-bit
Code
0
0
0
1
0
T
WR
Program
Command
T
OTD
Write Delay
16
Communication from reader to HCS412
Communication from HCS412 to reader
Start
2 LF
TE
Start
2 LF
TE
Start
2 LF
TE
ACK
ACK
T
TTD
T
PU
T
ATO
L
M
L
M
Data Bits
L
M
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