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| 型號： | SCS152 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | HM Series Hermetically Sealed Basic Switch, Single Pole Double Throw Circuitry, 0.5 A at 28 Vdc, Integral Lever Actuator, Solder Termination |
| 中文描述： | 而Keeloq令牌卡芯片 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 182K |
| 代理商： | SCS152 |
SCS152
DS40150B-page 8
Preliminary
1997 Microchip Technology Inc.
3.4
BITPROG
The BITPROG command modifies one bit in the
EEPROM. In the digit area, this command decrements
the current digit or in the CFG field it programs the bits
to AD(0) xor FUSE-BLOWN state: PC0 is erased to a
‘1’; PC1 is written to a ‘0’; LOCK0 is written to a ‘0’,
when the fuse is in blown state. Everywhere else in the
memory map, the current bit is written to a ‘0’.
Figure 3-4 diagrams the BITPROG command.
This command is signaled by pulsing SCI high. If the
operation is allowed, the SDIO line goes high. The
actual EEPROM modification is initiated by pulsing
SCK high. When the programming operation has been
completed, and SCK is low, the output goes low, indi-
cating that the command has completed.
3.5
ERASE
The waveforms for ERASE are the same as BITPROG;
the command is implicitly coded by the repetition of the
sequence of events.
The ERASE command executes different functions,
depending on the current address as shown in
Table 3-5:
FIGURE 3-4:
BITPROG
TABLE 3-4:
BITPROG FUNCTIONS
Field
Description
CID
SER
D4…D0
Writes current bit to ‘0’
Writes current bit to ‘0’
Decrements the current digit
Program the current bit to the value of
(AD(0) xor FUSE-BLOWN)
Writes current bit to ‘0’
Writes current bit to ‘0’
CFG
USER0
UKEY0
TABLE 3-5:
ERASE FUNCTIONS
Field
Description
CID
SER
O4…O1
—
—
Sets the next digit to the maximum digit
value
—
0x6C…0x73: Erases current nibble to
all ‘1’ state
0x74…0x93: Erases the current byte to
all ‘1’ state
Erases the current byte to all ‘1’ state
CFG
USER0
UKEY0
SCK
SDIO
T
H
T
S
T
C
T
C
T
PROG
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