ZAMC4100 datasheet(96/156 Pages) RENESAS

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ZAMC4100 Datasheet

January 26, 2016

3.13.2. LIN PHY Operation

The status of the LIN PHY is checked by reading its interrupt flags mapped in the LINSTAT register. When an

interrupt flag is set, the MCU can clear it by “dummy” writing ‘1’ in the corresponding LINSTAT register bit.

LIN Wake-Up Detection

When the system is in SLEEP or STANDBY Mode, the LIN transmitter is powered-down and only the receiver is

functional. The last is used for detecting the LIN bus wake-up event.

The ZAMC4100 supports two wake-up scenarios depending on the value of the LINWUMD bit (see Table 3.46). If

LINWUMD = 0 (see Figure 3.27-A), a wake-up is detected when there is a falling edge at the LIN pin followed by

a dominant bus level longer than time tLINWU. If bit LINWUMD = 1 (Figure 3.27-B), a wake-up is detected when

there is falling edge at the LIN pin, followed by a dominant bus level longer than tLINWU and a rising edge at the

LIN pin. The value of the parameter tLINWU is defined in Table 1.7.

Figure 3.27 LIN Wake-up Detection Depending on the Value of the LINWUMD Bit

LIN pin

state

tLINWU

DOM.

REC.

SLEEP

NORMAL

A) LINWUMD=0

B) LINWUMD=1

wake-up

When a valid wake-up is detected, the interrupt flag LINWUIF is set to high and the LIN transmitter is enabled.

The status of this flag can be checked by reading the LINSTAT register (Table 3.48).

LIN Baud Rate

The LIN PHY supports a fast mode which provides a higher baud-rate communication than is specified in the

standard (see Table 1.7). The LIN fast mode is enabled by setting high the LINFAST bit of register LINCTRL.

The LIN PHY has two self-diagnostics protections: LIN short and LIN dominant time-out.

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