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參數(shù)資料
| 型號(hào)： | SCS152-IWF |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Small glass bead with axial leads |
| 中文描述： | 而Keeloq令牌卡芯片 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 182K |
| 代理商： | SCS152-IWF |
SCS152
DS40150B-page 4
Preliminary
1997 Microchip Technology Inc.
2.5
CFG Field
The CFG field is further divided into four subfields:
With ‘PC0 = 0’ and ‘PC1 = 1’, the device is in issuer
mode; with ‘PC0 = 1’ and ‘PC1 = 0’, the device is in user
mode. Some commands can only be used in issuer
mode.
2.6
USER0 Field
The user area can be reprogrammed to any state by the
user in user mode. It also can be locked using the
LOCK0 bit. In issuer mode, this field typically contains
the packaging status of the device. In user mode, this
field can be used for application dependent data.
2.7
UKEY0 Field
In issuer mode, this field contains the transport code; in
user mode, the UKEY0 field contains the key used in
the signature function. The transport code is
programmed during wafer probe and is completely
reprogrammed during personalization to the value of
the key.
3.0
COMMAND INTERFACE
The SCS152 accepts the following basic commands:
RESET, RDBIT/PUTBIT, BITPROG and ERASE. The
extended commands are DECR-ERASE and initiate
signature function.
The device interprets five different SCI/SCK sequences
for all its commands:
a)
An overlap of SCI and SCK for RESET
b)
A single pulse on SCK for RDBIT or PUTBIT
c)
A single pulse on SCI followed by a pulse on
SCK for BITPROG
d)
A repeat of c) for ERASE
e)
A double pulse on SCI followed by a pulse on
SCK for extended commands
Normally, any one of these sequences can be followed
by another; however, once the signature function has
been started, a fixed sequence of commands must fol-
low.
The extended functions are accessed by double pulse
on SCI in the correct address range. Depending on the
current address, the same sequence of events on SCI
and SCK will perform different functions.
TABLE 3-1:
EXTENDED FUNCTIONS
Name
Address
Description
PC0
104
First bit of the issuer mode/user
mode indicator
Second bit of the issuer mode/
user mode indicator
Unused
Unlocked status of USER0 area
in user mode: ‘0’ means locked
PC1
105
N.U.
LOCK0
106
107
Field
Extended Function Accessed by
Double SCI Pulse
CID
SER
D4…D0
CFG
USER0
UKEY0
Test modes
BITPROG
DECR-ERASE
Test modes
BITPROG
Address 163: test mode
Address 259: Initiate signature operation
Other addresses perform BITPROG
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