PIC12F635ESS datasheet(136/234 Pages) MICROCHIP

136 / 234 page

PIC12F635/PIC16F636/639

DS41232D-page 134

12.6

Brown-out Reset (BOR)

The BOREN0 and BOREN1 bits in the Configuration

Word register select one of four BOR modes. Two

modes have been added to allow software or hardware

control of the BOR enable. When BOREN<1:0> = 01,

the SBOREN bit of the PCON register enables/disables

the BOR allowing it to be controlled in software. By

selecting BOREN<1:0>, the BOR is automatically

disabled in Sleep to conserve power and enabled on

wake-up. In this mode, the SBOREN bit is disabled. See

If VDD falls below VBOD for greater than parameter

(TBOD) (see Section 15.0 “Electrical Specifications”),

the Brown-out situation will reset the device. This will

occur regardless of VDD slew rate. A Reset is not

ensured to occur if VDD falls below VBOD for less than

parameter (TBOD).

On any Reset (Power-on, Brown-out Reset, Watchdog

Timer, etc.), the chip will remain in Reset until VDD rises

above VBOD (see Figure 12-3). The Power-up Timer

will now be invoked, if enabled and will keep the chip in

Reset an additional nominal 64 ms.

If VDD drops below VBOD while the Power-up Timer is

running, the chip will go back into a Brown-out Reset

and the Power-up Timer will be re-initialized. Once VDD

rises above VBOD, the Power-up Timer will execute a

64 ms Reset.

FIGURE 12-3:

BROWN-OUT RESET SITUATIONS

Note:

The Power-up Timer is enabled by the

PWRTE bit in the Configuration Word

64 ms(1)

VBOD

VDD

Internal

Reset

VBOD

VDD

Internal

Reset

64 ms(1)

< 64 ms

64 ms(1)

VBOD

VDD

Internal

Reset

Note 1:

Nominal 64 ms delay only if PWRTE bit is programmed to ‘0’.

PIC12F635ESS датащи(PDF) 136 Page - Microchip Technology

PIC12F635ESS датащи(HTML) 136 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL