C8051F961-A-GM Silicon Labs, C8051F961-A-GM Datasheet - Page 199

• Manufacturer Part Number: C8051F961-A-GM
• Description: 8-bit Microcontrollers - MCU 128KB, DC-DC, LCD AES, QFN40
• Manufacturer: Silicon Labs

Specifications of C8051F961-A-GM

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 128 KB
• Data Ram Size: 8448 B
• On-chip Adc: Yes
• Operating Supply Voltage: 2.5 V to 3.3 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: QFN-40
• Mounting Style: SMD/SMT
• Number Of Programmable I/os: 34
• Number Of Timers: 4

14.6.5.1. CTR Data Flow
The AES0 module data flow for CTR encryption and decryption shown in Figure 14.5. The data flow is the
same for encryption and decryption. The AES0DCF sfr is always configured to XOR AES0XIN with the
AES Core output.The XOR on the input is not used. The AES core is configured for an encryption opera-
tion. The encryption key is written to AES0KIN. The key size is set to the desired key size.
For an encryption operation, the plaintext is written to the AES0BIN sfr and the ciphertext is read from
AES0YOUT. For decryption, the ciphertext is written to AES0BIN and the plaintext is read from
AES0YOUT.
Note the counter must be incremented after each block using software.
AES0DCFG
AES0BCFG
AES0KIN
internal state
machine
Figure 14.8. Counter Mode Data Flow
Key
In
Rev. 0.5
AES0BIN
Data Out
Data In
Core
AES
AES0YOUT
+
+
Key
Out
AES0XIN
C8051F96x
199