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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16F818-E/ML датащи(PDF) 95 Page - Microchip Technology |
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PIC16F818-E/ML датащи(HTML) 95 Page - Microchip Technology |
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95 / 176 page  2004 Microchip Technology Inc. DS39598E-page 93 PIC16F818/819 12.9 Power Control/Status Register (PCON) The Power Control/Status register, PCON, has two bits to indicate the type of Reset that last occurred. Bit 0 is Brown-out Reset Status bit, BOR. Bit BOR is unknown on a Power-on Reset. It must then be set by the user and checked on subsequent Resets to see if bit BOR cleared, indicating a Brown-out Reset occurred. When the Brown-out Reset is disabled, the state of the BOR bit is unpredictable. Bit 1 is Power-on Reset Status bit, POR. It is cleared on a Power-on Reset and unaffected otherwise. The user must set this bit following a Power-on Reset. TABLE 12-1: TIME-OUT IN VARIOUS SITUATIONS TABLE 12-2: STATUS BITS AND THEIR SIGNIFICANCE TABLE 12-3: RESET CONDITION FOR SPECIAL REGISTERS Oscillator Configuration Power-up Brown-out Reset Wake-up from Sleep PWRTE = 0 PWRTE = 1 PWRTE = 0 PWRTE = 1 XT, HS, LP TPWRT + 1024 • TOSC 1024 • TOSC TPWRT + 1024 • TOSC 1024 • TOSC 1024 • TOSC EXTRC, EXTCLK, INTRC TPWRT 5-10 µs(1) TPWRT 5-10 µs(1) 5-10 µs(1) Note 1: CPU start-up is always invoked on POR, BOR and wake-up from Sleep. POR BOR TO PD 0x1 1 Power-on Reset 0x0 x Illegal, TO is set on POR 0xx 0 Illegal, PD is set on POR 101 1 Brown-out Reset 110 1 WDT Reset 110 0 WDT wake-up 11u u MCLR Reset during normal operation 111 0 MCLR Reset during Sleep or interrupt wake-up from Sleep Legend: u = unchanged, x = unknown 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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