33903 datasheet(84/107 Pages) NXP

84 / 107 page

NXP Semiconductors

33903/4/5

SERIAL PERIPHERAL INTERFACE

10.4

Flags and device status

10.4.1 Description

The table below is a summary of the device flags, I/O real time level, device Identification, and includes examples of SPI commands (SPI

commands do not use parity functions). They are obtained using the following commands.

This command is composed of the following:

bits 15 and 14:

• [1 1] for failure flags

• - [0 0] for I/O real time status, device identification and CAN LIN driver receiver real time state.

• bit 13 to 9 are the register address from which the flags is to be read.

•bit 8 = 1 (this is not parity bit function, as this is a read command).

When a failure event occurs, the respective flag is set and remains latched until it is cleared by a read command (provided the failure

event has recovered).

Table 38. LIN2 register(51)

MOSI First byte [15-8]

[b_15 b_14] 10_010 [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 10_ 100P

LIN mode[1] LIN mode[0] Slew rate[1] Slew rate[0]

LIN T2 on

VSUP ext

Default state

Condition for default

POR

Bits

Description

b7 b6

LIN mode [1], LIN mode [0] - LIN 2 interface mode control, Wake-up enable / disable

LIN2 disable, Wake-up capability disable

not used

LIN2 disable, Wake-up capability enable

LIN2 Transmit Receive mode(50)

b5 b4

Slew rate[1], Slew rate[0] LIN 2slew rate selection

Slew rate for 20 kbit/s baud rate

Slew rate for 10 kbit/s baud rate

Slew rate for fast baud rate

LIN T2 on

LIN 2 termination OFF

LIN 2 termination ON

VSUP ext

LIN goes recessive when device VSUP/2 is below typically 6.0 V. This is to meet J2602 specification

LIN continues operation below VSUP/2 6.0 V, until 5 V-CAN is disabled.

Notes

50.

The LIN interface can be set in TXD/RXD mode only when the TXD-L input signal is in a recessive state. An attempt to set TXD/RXD

mode while TXD-L is low, will be ignored and the LIN interface will remain disabled.

51.

In order to use the LIN interface, the 5V-CAN regulator must be set to ON.

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