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PIC16F15213 データシート(PDF) 66 Page - Microchip Technology |
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PIC16F15213 データシート(HTML) 66 Page - Microchip Technology |
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66 / 439 page  10.2 Brown-out Reset (BOR) The BOR circuit holds the device in Reset when VDD reaches a selectable minimum level. Between the POR and BOR, complete voltage range coverage for execution protection can be implemented. The Brown-out Reset module has four operating modes controlled by the BOREN bits. The four operating modes are: • BOR is always on • BOR is off when in Sleep • BOR is controlled by software • BOR is always off Refer to Table 10-1 for more information. The Brown-out Reset voltage level is selectable by configuring the BORV bits. A VDD noise rejection filter prevents the BOR from triggering on small events. If VDD falls below VBOR for a duration greater than parameter TBORDC, the device will reset and the BOR bit will be cleared, indicating the Brown-out Reset condition occurred. See Figure 10-2. 10.2.1 BOR Is Always On When the BOREN bits are programmed to ‘11’, the BOR is always on. The device start-up will be delayed until the BOR is ready and VDD is higher than the BOR threshold. BOR protection is active during Sleep. The BOR does not delay wake-up from Sleep. 10.2.2 BOR Is Off in Sleep When the BOREN bits are programmed to ‘10’, the BOR is on, except in Sleep. BOR protection is not active during Sleep, but device wake-up will be delayed until the BOR can determine that VDD is higher than the BOR threshold. The device wake-up will be delayed until the BOR is ready. 10.2.3 BOR Controlled by Software When the BOREN bits of Configuration Words are programmed to ‘01’, the BOR is controlled by the SBOREN bit. The device start-up is not delayed by the BOR Ready condition or the VDD level. BOR protection begins as soon as the BOR circuit is ready. The status of the BOR circuit is reflected in the BORRDY bit. BOR protection is unchanged by Sleep. Table 10-1. BOR Operating Modes BOREN SBOREN Device Mode BOR Mode Instruction Execution upon: Release of POR Wake-up from Sleep 11(1) X X Active Wait for release of BOR (BORRDY = 1) Begins immediately 10 X Awake Active Wait for release of BOR (BORRDY = 1) N/A Sleep Hibernate N/A Wait for release of BOR (BORRDY = 1) 01 1 X Active Wait for release of BOR (BORRDY = 1) Begins immediately 0 X Hibernate 00 X X Disabled Begins immediately PIC16F15213/14/23/24/43/44 Resets © 2020-2022 Microchip Technology Inc. and its subsidiaries Data Sheet DS40002195E-page 66 |
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