mc33905s Freescale Semiconductor, Inc, mc33905s Datasheet - Page 64

• Manufacturer Part Number: mc33905s
• Description: System Basis Chip Gen2 With High Speed Can And Lin Interface
• Manufacturer: Freescale Semiconductor, Inc

.SPECIFIC MODE REGISTER
The SPE MODE register is used for the following
operation:
RESET functions.
be extended up to 32s).
secured SPI command, which consist in 2 commands:
selection or SAFE pin activation:
Normal mode only):
random code)
64
33904/5
SERIAL PERIPHERAL INTERFACE
DETAIL OF CONTROL BITS AND REGISTER MAPPING
Table 19. Specific Mode Register, SPE_MODE
- Set the device in RESET mode, to exercise or test the
- Go to INIT mode, using the Secure SPi command.
- Go to FLASH mode (in this mode the watchdog timer can
- Activate the SAFE terminal by S/W.
These mode (called Special Mode) are accessible via
1) reading a random code and
2) then write the inverted random code plus mode
Return to INIT mode is done as follow (this is done from
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 (Rx= 6 bits
[b_15 b_14] 01_001 [P/N]
b5....b0
b7, b6
MOSI First Byte [15-8]
Bit
Condition for default
00
01
10
11
01 01_ 001 P
Default state
[Rnd_C4b... Rnd_C0b] - Random Code inverted, these 6 bits are the inverted bits obtained from the SPE-MODE Register read command.
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.
Sel_Mod[1]
bit 7
0
Sel_Mod[0]
bit 6
0
Rnd_C5b
bit 5
0
Description
RESET mode
FLASH mode
Rnd_C4b
MOSI Second Byte, bits 7-0
INIT mode
bit 4
HH] (Rix= random code inverted)
mode, with following commands:
random code)
and random code bits 3:0 inverted
HH] (Rix= random code inverted)
go to INIT mode, except that the b7, b6 are set according to
table above (b7, b6 = 00 - go to reset, b7, b6 = 10 - go to
FLASH).
N/A
2) Write INIT mode + random code inverted
MOSI : 0101 0010 01 Ri5 Ri4 Ri3 Ri2 Ri1 Ri0 [Hex 0x 52
MISO : xxxx xxxx xxxx xxxx (don’t care)
SAFE pin activation: SAFE pin can be set low, only in INIT
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 (Rx= 6 bits
2) Write INIT mode + random code bits 5:4 not inverted
MOSI : 0101 0010 01 R5 R4 Ri3 Ri2 Ri1 Ri0 [Hex 0x 52
MISO : xxxx xxxx xxxx xxxx (don’t care)
Return to RESET or FLASH mode is done similarly to the
POR
Rnd_C3b
bit 3
0
Analog Integrated Circuit Device Data
Rnd_C2b
bit 2
0
Freescale Semiconductor
Rnd_C1b
bit 1
0
Rnd_C0b
bit 0
0