CC1010-RTR1 datasheet(77/152 Pages) TI

77 / 152 page

CC1010

SWRS047

Page 77 of 152

CRPCON (0xC3) - Encryption / Decryption Control Register

Bit

Name

R/W

Reset value

Description

Reserved, read as 0

CRPIE

R/W

Encryption / Decryption interrupt enable flag. In order for

CRPIF to raise an interrupt, EIE.ADIE must also be

set.

CRPIF

R/W

Encryption / Decryption interrupt flag.

CRPIF is set by hardware when an encryption /

decryption is completed.

CRPIF must be cleared by

software. Because the encryption /decryption shares an

interrupt line with the ADC,

EXIF.ADIF must also be

cleared by software before exiting the interrupt service

routine.

EXIF.ADIF should be cleared before CRPIF,

so that the 8051 is ready to receive a new interrupt

immediately after

CRPIF is cleared.

LOADKEYS

R/W

Enable / disable loading of keys at start up.

0 : New keys are not loaded at encryption / decryption

start up. The same keys as used during the previous

encryption / decryption will be used again.

1 : New keys are loaded from RAM at encryption /

decryption start up. The key RAM location is given by

CRPKEY.

CRPMD

R/W

OFB / CFB Mode

0 : OFB (Output Feedback Mode) is selected

1 : CFB (Cipher Feedback Mode) is selected

ENCDEC

R/W

Encryption / Decryption select

0 : Encryption is selected

1 : Decryption is selected

TRIDES

R/W0

Reserved, write 0

CRPEN

R/W1

Encryption / Decryption start and status bit.

When set by software, encryption / decryption is

initiated. It cannot be cleared by software, but will be

cleared by hardware when the encryption / decryption is

completed.

CRPKEY (0xC4) - Encryption / Decryption Key Location Register

Bit

Name

R/W

Reset value

Description

7:0

CRPKEY(7:0)

R/W

0x00

CRPKEY(7:0) gives the 8 most significant bits of the

external RAM location of the DES keys. The keys are

located in RAM as given in Table 24.

CRPDAT (0xC5) - Encryption / Decryption Data Location Register

Bit

Name

R/W

Reset value

Description

7:0

CRPDAT(7:0)

R/W

0x00

CRPDAT(7:0) gives the 8 most significant bits of

the external RAM address of the first byte to be

encrypted / decrypted. The 3 least significant address

bits are all zeros.

CRPCNT (0xC6) – Encryption / Decryption Counter

Bit

Name

R/W

Reset value

Description

7:0

CRPCNT(7:0)

R/W

0x00

CRPCNT(7:0) gives the number of bytes to be

encrypted / decrypted. If

CRPCNT=0, 256 bytes are

encrypted / decrypted.

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