UM0434 datasheet(64/390 Pages) STMICROELECTRONICS

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UM0434

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The TCR fields are described in

Table 41.

Table 40.

Timer control register (TCR)

323334 35 36 37 3839 40 41 4243

46 47

50 51

Field WP WRC WIE DIE FP FIE ARE — WPEXT

FPEXT

—

Reset

All zeros

R/W

SPR

SPR 340

Table 41.

TCR field descriptions

Bits

Name

Description

32–33

Watchdog timer period, When concatenated with WPEXT, specifies one of 64 bit locations of the

time base used to signal a watchdog timer exception on a transition from 0 to 1.

TCR[WPEXT]||TCR[WP] == 000000 selects TBU[32] (msb of TBU).

TCR[WPEXT]||TCR[WP] == 111111 selects TBL[63] (lsb of TBL).

34–35

WRC

Watchdog timer reset control. Software can set WRC but cannot clear it except by a software-

induced reset. After WRC is written to a non-zero value, software can no longer alter it.

00 No watchdog timer reset can occur.

01 Force processor checkstop on second time-out of the watchdog timer.

10 Assert processor reset output (

p_resetout_b) on second time-out of watchdog timer.

11 Reserved.

WIE

Watchdog timer interrupt enable.

0 Watchdog timer interrupts disabled.

1 Watchdog timer interrupts enabled.

DIE

Decrementer interrupt enable.

0 Decrementer interrupts disabled.

1 Decrementer interrupts enabled.

38–39

Fixed-interval timer period. When concatenated with FPEXT, specifies one of 64 bit locations of

the time base to signal a fixed-interval timer exception on a transition from 0 to 1.

TCR[FPEXT]||TCR[FP] == 000000 selects TBU[32] (msb of TBU).

TCRFP[EXT]||TCR[FP] == 111111 selects TBL[63] (lsb of TBL).

FIE

Fixed-interval interrupt enable.

0 Fixed-interval interrupts disabled.

1 Fixed-interval interrupts enabled.

ARE

Auto-reload enable. Controls whether the value in DECAR is reloaded into DEC when the DEC

value reaches 0000_0001.

0 Auto-reload disabled.

1 Auto-reload enabled.

—

Reserved, should be cleared.

43–46 WPEXT

Watchdog timer period extension (see above description for WP). WPEXT | WP select one of the

64 TB bits used to signal a watchdog timer exception.

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