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PIC16F876ATI/ML Datasheet(PDF) 151 Page - Microchip Technology |
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PIC16F876ATI/ML Datasheet(HTML) 151 Page - Microchip Technology |
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151 / 234 page  2003 Microchip Technology Inc. DS39582B-page 149 PIC16F87XA 14.10 Power Control/Status Register (PCON) The Power Control/Status Register, PCON, has up to two bits depending upon the device. Bit 0 is the Brown-out Reset Status bit, BOR. The BOR bit is unknown on a Power-on Reset. It must then be set by the user and checked on subsequent Resets to see if it has been cleared, indicating that a BOR has occurred. When the Brown-out Reset is disabled, the state of the BOR bit is unpredictable and is, therefore, not valid at any time. Bit 1 is the Power-on Reset Status bit, POR. It is cleared on a Power-on Reset and unaffected other- wise. The user must set this bit following a Power-on Reset. TABLE 14-3: TIME-OUT IN VARIOUS SITUATIONS TABLE 14-4: STATUS BITS AND THEIR SIGNIFICANCE TABLE 14-5: RESET CONDITIONS FOR SPECIAL REGISTERS Oscillator Configuration Power-up Brown-out Wake-up from Sleep PWRTE = 0 PWRTE = 1 XT, HS, LP 72 ms + 1024 TOSC 1024 TOSC 72 ms + 1024 TOSC 1024 TOSC RC 72 ms — 72 ms — POR BOR TO PD Condition 0x 1 1 Power-on Reset 0x 0 x Illegal, TO is set on POR 0x x 0 Illegal, PD is set on POR 10 1 1 Brown-out Reset 11 0 1 WDT Reset 11 0 0 WDT Wake-up 11 u u MCLR Reset during normal operation 11 1 0 MCLR Reset during Sleep or Interrupt Wake-up from Sleep Legend: x = don’t care, u = unchanged Condition Program Counter Status Register PCON Register Power-on Reset 000h 0001 1xxx ---- --0x MCLR Reset during normal operation 000h 000u uuuu ---- --uu MCLR Reset during Sleep 000h 0001 0uuu ---- --uu WDT Reset 000h 0000 1uuu ---- --uu WDT Wake-up PC + 1 uuu0 0uuu ---- --uu Brown-out Reset 000h 0001 1uuu ---- --u0 Interrupt Wake-up from Sleep PC + 1(1) uuu1 0uuu ---- --uu Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’ Note 1: When the wake-up is due to an interrupt and the GIE bit is set, the PC is loaded with the interrupt vector (0004h). |
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