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Product data sheet Rev. 2 — 18 April 2014 25 of 60

NXP Semiconductors

UJA1167

Mini high-speed CAN system basis chip with Standby/Sleep modes &

watchdog

6.10 Wake-up and interrupt event diagnosis via pin RXD

Wake-up and interrupt event diagnosis in the UJA1167 is intended to provide the

microcontroller with information on the status of a range of features and functions. This

information is stored in the event status registers (Table 20

to Table 22) and is signaled on

pin RXD, if enabled.

A distinction is made between regular wake-up events and interrupt events (at least one

regular wake-up source must be enabled to allow the UJA1167 to switch to Sleep mode;

see Section 6.1.1.3

[1] UJA1167TK/VX only.

PO and WDF interrupts are always captured. Wake-up and interrupt detection can be

enabled/disabled for the remaining events individually via the event capture enable

registers (Table 24

to Table 26).

Table 17. Regular events

Symbol Event Power-on Description

CW CAN wake-up disabled a CAN wake-up event was detected while the

transceiver was in CAN Offline mode.

WPR rising edge on WAKE

disabled a rising-edge wake-up was detected on pin WAKE

WPF falling edge on WAKE

disabled a falling-edge wake-up was detected on pin WAKE

Table 18. Diagnostic events

Symbol Event Power-on Description

PO power-on always

enabled

the UJA1167 has exited Off mode (after battery power has been

restored/connected)

OTW overtemperature warning disabled the IC temperature has exceeded the overtemperature warning

threshold (not in Sleep mode)

SPIF SPI failure disabled SPI clock count error (only 16-, 24- and 32-bit commands are valid),

illegal WMC, NWP or MC code or attempted write access to locked

WDF watchdog failure always

enabled

watchdog overflow in Window or Timeout mode or watchdog triggered

too early in Window mode; a system reset is triggered immediately in

response to a watchdog failure in Window mode; when the watchdog

overflows in Timeout mode, a system reset is only performed if a WDF

is already pending (WDF = 1)

VEXTO

[1]

VEXT overvoltage disabled VEXT overvoltage detected

VEXTU

[1]

VEXT undervoltage disabled VEXT undervoltage detected

V1U V1 undervoltage disabled voltage on V1 has dropped below the 90 % undervoltage threshold

when V1 is active (event is not captured in Sleep mode because V1 is

off). V1U event capture is independent of the setting of bits V1RTC.

CBS CAN bus silence disabled no activity on CAN bus for t

to(silence)

(detected only when CBSE = 1

while bus active)

CF CAN failure disabled one of the following CAN failure events detected:

- CAN transceiver deactivated due to a V1 undervoltage

- CAN transceiver deactivated due to a dominant clamped TXD (not

in Sleep mode)