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參數(shù)資料
| 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)： | 5/16頁 |
| 文件大?。?/td> | 182K |
| 代理商： | SCS152 |
SCS152
1997 Microchip Technology Inc.
Preliminary
DS40150B-page 5
3.1
Access Conditions
The condition codes are:
Note 1:
If the access condition does not allow a command that modifies the EEPROM (i.e., BITPROG, ERASE or
DECR-ERASE), it will be converted into a RDBIT command.
The commands that can potentially change the EEPROM (even if it is converted into a RDBIT command) do
not increment the I/O address counter.
Any command that modifies the EEPROM checks the internal high voltage sensor during the programming
and goes into the standby state if the sensor indicates the internal high voltage was not high enough. Power
must be removed to clear this condition.
If the device is not in issuer mode and not in user mode, only BITPROG access is allowed to the CFG field.
2:
3:
4:
TABLE 3-2:
ACCESS CONDITIONS IN ISSUER MODE
Field
RDBIT
BITPROG
ERASE
Extended Commands
CID
SER
O4…O1
O0
CFG
USER0
Y
Y
Y
Y
Y
Y
F and TC
TC
TC and Z
TC and Z
TC
Y
N
N
test modes
BITPROG
TC and B
N
N
Y
DECR-ERASE: TC and Z
N
test modes
BITPROG
BITPROG
test modes
SIGN: Y
UKEY0
‘1’
TC
TC
TABLE 3-3:
ACCESS CONDITIONS IN USER MODE
Field
RDBIT
BITPROG
ERASE
Extended Commands
CID
SER
O4…O1
O0
CFG
USER0
Y
Y
Y
Y
Y
Y
N
N
Z
Z
Y
L
N
N
B
N
N
L
test modes
BITPROG
DECR-ERASE: Z
N
test modes
BITPROG
BITPROG
test modes
SIGN: Y
UKEY0
‘1’
N
N
Y
N
TC
‘1’
F
Z
B
L
BITPROG
Command always allowed
No access allowed and it is converted into a RDBIT command
Transport code must be submitted before the operation is allowed
Output always logic high in this field
Command allowed if the fuse is not blown
The digit code is nonzero
Command allowed if previous operation was BITPROG and was successfully
Command allowed if LOCK0 bit in the CFG field is ‘1’
The BITPROG condition is checked and executed
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