RM0090 Hash processor (HASH)
Doc ID 018909 Rev 4 612/1422
22.4.2 HASH control register (HASH_CR) for
STM32F42xxx and STM32F43xxx
Address offset: 0x00
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
ALGO[1]
Reserved
LKEY
rw rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
MDMAT DINNE NBW ALGO[0] MODE DATATYPE DMAE INIT
Reserved
rwrrrrrrwrwrwrwrww
Bits 31:19 Reserved, forced by hardware to 0.
Bit 17 Reserved, forced by hardware to 0.
Bit 16 LKEY: Long key selection
This bit selects between short key (≤ 64 bytes) or long key (> 64 bytes) in HMAC
mode
0: Short key (≤ 64 bytes)
1: Long key (> 64 bytes)
Note: This selection is only taken into account when the INIT bit is set and MODE
= 1. Changing this bit during a computation has no effect.
Bits 15:14 Reserved, forced by hardware to 0.
Bit 13 MDMAT: Multiple DMA Transfers
This bit is set when hashing large files when multiple DMA transfers are needed.
0: DCAL is automatically set at the end of a DMA transfer.
1: DCAL is not automatically set at the end of a DMA transfer.
Bit 12 DINNE: DIN not empty
This bit is set when the HASH_DIN register holds valid data (that is after being
written at least once). It is cleared when either the INIT bit (initialization) or the
DCAL bit (completion of the previous message processing) is written to 1.
0: No data are present in the data input buffer
1: The input buffer contains at least one word of data
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