C8051F962-A-GM Silicon Labs, C8051F962-A-GM Datasheet - Page 195

• Manufacturer Part Number: C8051F962-A-GM
• Description: 8-bit Microcontrollers - MCU 128KB, DC-DC, AES DQFN76
• Manufacturer: Silicon Labs

Specifications of C8051F962-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: DQFN-76
• Mounting Style: SMD/SMT
• Number Of Programmable I/os: 57
• Number Of Timers: 4

14.6.4. CBC Decryption
The AES0 module data flow for CBC encryption is shown in Figure 14.6. The ciphertext is written to the
AES0BIN sfr. For the first block, the initialization vector is written to the AES0XIN sfr. For subsequent
blocks, the previous block ciphertext is written to the AES0XIN sfr. The AES0DCF sfr is configured to XOR
AES0XIN with AES0BIN for the AES core data input. The XOR on the output is not used. The AES core is
configured for an encryption operation. The encryption key is written to AES0KIN. The key size is set to the
desired key size.
AES0DCFG
AES0BCFG
AES0KIN
internal state
Figure 14.6. CBC Decryption Data Flow
machine
Key
In
Rev. 0.5
AES0BIN
Data Out
Data In
Core
AES
AES0YOUT
+
+
Key
Out
AES0XIN
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