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 V_DD 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:
BOREN	SBOREN	Device Mode	BOR Mode	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
`10`	`X`	Sleep	Hibernate	N/A	Wait for release of BOR (BORRDY = `1`)
`01`	`1`	X	Active	Wait for release of BOR (BORRDY = `1`)	Begins immediately
`01`	`0`	X	Hibernate	Wait for release of BOR (BORRDY = `1`)	Begins immediately
`00`	`X`	X	Disabled	Begins immediately

Note:

In this specific case, ‘Release of POR’ and ‘Wake-up from Sleep’, there is no delay in start-up. The BOR Ready flag (BORRDY = 1) will be set before the CPU is ready to execute instructions because the BOR circuit is forced on by the BOREN bits.