AT88SC0404C_09 ATMEL [ATMEL Corporation], AT88SC0404C_09 Datasheet - Page 11

• Manufacturer Part Number: AT88SC0404C_09
• Description: CryptoMemory 4 Kbit
• Manufacturer: ATMEL [ATMEL Corporation]

9.2.
10.
2023KS–SMEM–10/09
Synchronous 2-wire Serial Interface
The synchronous mode is the default after powering up V
applications using CryptoMemory in standard plastic packages, this is the only communication protocol.
•
•
Figure 11.
Note:
Communication Security Modes
Communications between the device and host operate in three basic modes. Standard mode is the default mode for
the device after power-up. Authentication mode is activated by a successful authentication sequence. Encryption mode
is activated by a successful encryption activation following a successful authentication.
Table 4.
Note:
CLK-SCL
Standard
Authentication
Encryption
I/O-SDA
Power-up V
After stable V
RST
V cc
Mode
Five clock pulses must be sent before the first command is issued.
1. Configuration data include viewable areas of the Configuration Zone except the passwords:
MDC: Modification Detection Code
MAC: Message Authentication Code.
Synchronous 2-wire Protocol
Communication Security Modes
CC
CC
, RST goes high also.
, CLK-SCL and I/O-SDA may be driven.
Configuration Data
1
clear
clear
clear
2
3
(1)
4
User Data
encrypted
5
clear
clear
CC
due to an internal pull-up on RST. For embedded
Passwords
encrypted
encrypted
clear
AT88SC0404C
Data Integrity Check
MDC
MAC
MAC
(1)
(1)
(1)
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