Tension de aliementacion PIC

[villellaf]

Hola  a todos , necesito trabajar con el pic16f73 a 3.3 v si bien en la especificaion funciona entre 2 y 5 v cuando le bajo la tension de la fuente a menos de  de 5 v se resetea, que me olvide de configuar?

Gracias

[AKENAFAB]

Revisa los bits de configuración , especificamente BOR , Brown Out Reset, según las especificaciones , si esta activado , este produce el reset con 4v.

12.8 Brown-out Reset (BOR)
The configuration bit, BODEN, can enable or disable
the Brown-out Reset circuit. If VDD falls below VBOR
(parameter D005, about 4V) for longer than TBOR
(parameter #35, about 100 μS), the brown-out situation
will reset the device. If VDD falls below VBOR for less
than TBOR, a RESET may not occur.
Once the brown-out occurs, the device will remain in
Brown-out Reset until VDD rises above VBOR. The
Power-up Timer then keeps the device in RESET for
TPWRT (parameter #33, about 72 mS). If VDD should fall
below VBOR during TPWRT, the Brown-out Reset process
will restart when VDD rises above VBOR, with the
Power-up Timer Reset. The Power-up Timer is always
enabled when the Brown-out Reset circuit is enabled,
regardless of the state of the PWRT configuration bit.