33903 datasheet(72/104 Pages) FREESCALE

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Table 19. Specific Mode Register, SPE_MODE

MOSI First Byte [15-8]

[b_15 b_14] 01_001 [P/N]

MOSI Second Byte, bits 7-0

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

01 01_ 001 P

Sel_Mod[1]

Sel_Mod[0]

Rnd_C5b

Rnd_C4b

Rnd_C3b

Rnd_C2b

Rnd_C1b

Rnd_C0b

Default state

Condition for default

POR

Bit

Description

b7, b6

Sel_Mod[1], Sel_Mod[0] - Mode selection: these 2 bits are used to select which mode the device will enter upon a SPI command.

RESET Mode

INIT Mode

FLASH Mode

N/A

b5....b0

[Rnd_C4b... Rnd_C0b] - Random Code inverted, these six bits are the inverted bits obtained from the SPE-MODE Register read command.

Analog Integrated Circuit Device Data

Freescale Semiconductor

33903/4/5

SERIAL PERIPHERAL INTERFACE

DETAIL OF CONTROL BITS AND REGISTER MAPPING

SPECIFIC MODE REGISTER

The SPE MODE Register is used for the Following

Operation

- Set the device in RESET Mode, to exercise or test the

RESET functions.

- Go to INIT Mode, using the Secure SPi command.

- Go to FLASH Mode (in this mode the watchdog timer can

be extended up to 32 s).

- Activate the SAFE pin by S/W.

This mode (called Special Mode) is accessible from the

secured SPI command, which consist of 2 commands:

1) reading a random code and

2) then write the inverted random code plus mode

selection or SAFE pin activation:

Return to INIT Mode is done as follow (this is done from

Normal Mode only):

1) Read random code:

MOSI : 0001 0011 0000 0000 [Hex:0x 13 00]

MISO report 16 bits, random code are bits (5-0)

miso = xxxx xxxx xxR5 R4 R3 R2 R1 R0 (RXD = 6 bits

random code)

2) Write INIT Mode + random code inverted

MOSI : 0101 0010 01 Ri5 Ri4 Ri3 Ri2 Ri1 Ri0 [Hex 0x 52

HH] (RIX = random code inverted)

MISO : xxxx xxxx xxxx xxxx (don’t care)

SAFE pin activation: SAFE pin can be set low, only in INIT

Mode, with following commands:

1) Read random code:

MOSI : 0001 0011 0000 0000 [Hex:0x 13 00]

MISO report 16 bits, random code are bits (5-0)

miso = xxxx xxxx xxR5 R4 R3 R2 R1 R0 (RXD = 6 bits

random code)

2) Write INIT Mode + random code bits 5:4 not inverted

and random code bits 3:0 inverted

MOSI : 0101 0010 01 R5 R4 Ri3 Ri2 Ri1 Ri0 [Hex 0x 52

HH] (RIX = random code inverted)

MISO : xxxx xxxx xxxx xxxx (don’t care)

Return to Reset or Flash Mode is done similarly to the go

to INIT Mode, except that the b7 and b6 are set according to

the table above (b7, b6 = 00 - go to reset, b7, b6 = 10 - go to

Flash).

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