ST7MC1 datasheet(302/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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IMPORTANT NOTES (Cont’d)

Impact on application

Software may execute the interrupt routine twice

after header reception.

Moreover, in reception mode, as the receiver is no

longer in mute mode, an interrupt will be generat-

ed on each data byte reception.

Workaround

The problem can be detected in the LINSCI inter-

rupt routine. In case of timeout error (LHE is set

and LHLR is loaded with 00h), the software can

check the RWU bit in the SCICR2 register. If RWU

is cleared, it can be set by software. Refer to Fig-

ure 169. Workaround is shown in bold characters.

Figure 169. LINSCI Interrupt routine

15.4

MISSING

DETECTION

BLDC

“Z

EVENT”

For a BLDC drive, the Dead Time generator is en-

abled through the MDTG register (PCN=0 and

DTE=1). If the duty cycle of the PWM signal gen-

erated to drive the motor is lower than the pro-

grammed deadtime, the Z event sampling will be

missing.

Workaround

The complementary PWM must be disabled by re-

setting the DTE bit in the MDTG register (see page

220).

As the current in the motor is very low in this case,

the MOSFET body diode can be used.

15.5 INJECTED CURRENT ON PD7

On rev.B silicon, the parameter Iinj(pin), injected

current on I/O pins (see section 12.8.1 on page

263), is limited at 0 (instead of -2mA) for the pin

PD7. This limitation is no longer present on rev.C

and A silicon and all I/O pins have the max values

+5/-2 mA.

15.6 RESET VALUE OF UNAVAILABLE PINS

On A silicon versions, some ports (Ports A, C and

E) have less than 8 pins. The bits associated to the

unavailable pins must always be kept at reset

state.

@interrupt void LINSCI_IT ( void ) /* LINSCI interrupt routine */

{

/* clear flags */

SCISR_buffer = SCISR;

SCIDR_buffer = SCIDR;

if ( SCISR_buffer & LHE )/* header error ? */

{

if (!LHLR)/* header time-out? */

{

if ( !(SCICR2 & RWU) )/* active mode ? */

{

_asm("sim");/* disable interrupts */

SCISR;

SCIDR;/* Clear RDRF flag */

SCICR2 |= RWU;/* set mute mode */

SCISR;

SCIDR;/* Clear RDRF flag */

SCICR2 |= RWU;/* set mute mode */

_asm("rim");/* enable interrupts */

}

Example using Cosmic compiler syntax

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