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PIC16F87 Datasheet(PDF) 135 Page - Microchip Technology |
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PIC16F87 Datasheet(HTML) 135 Page - Microchip Technology |
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135 / 230 page  2002-2013 Microchip Technology Inc. DS30487D-page 135 PIC16F87/88 TABLE 15-3: RESET CONDITION FOR SPECIAL REGISTERS 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). TABLE 15-4: INITIALIZATION CONDITIONS FOR ALL REGISTERS Register Power-on Reset, Brown-out Reset MCLR Reset, WDT Reset Wake-up via WDT or Interrupt W xxxx xxxx uuuu uuuu uuuu uuuu INDF N/A N/A N/A TMR0 xxxx xxxx uuuu uuuu uuuu uuuu PCL 0000h 0000h PC + 1(2) STATUS 0001 1xxx 000q quuu(3) uuuq quuu(3) FSR xxxx xxxx uuuu uuuu uuuu uuuu PORTA (PIC16F87) PORTA (PIC16F88) xxxx 0000 xxx0 0000 uuuu 0000 uuu0 0000 uuuu uuuu uuuu uuuu PORTB (PIC16F87) PORTB (PIC16F87) xxxx xxxx 00xx xxxx uuuu uuuu 00uu uuuu uuuu uuuu uuuu uuuu PCLATH ---0 0000 ---0 0000 ---u uuuu INTCON 0000 000x 0000 000u uuuu uuuu(1) PIR1 -000 0000 -000 0000 -uuu uuuu(1) PIR2 00-0 ---- 00-0 ---- uu-u ----(1) TMR1L xxxx xxxx uuuu uuuu uuuu uuuu TMR1H xxxx xxxx uuuu uuuu uuuu uuuu T1CON -000 0000 -uuu uuuu -uuu uuuu TMR2 0000 0000 0000 0000 uuuu uuuu T2CON -000 0000 -000 0000 -uuu uuuu SSPBUF xxxx xxxx uuuu uuuu uuuu uuuu SSPCON 0000 0000 0000 0000 uuuu uuuu CCPR1L xxxx xxxx uuuu uuuu uuuu uuuu CCPR1H xxxx xxxx uuuu uuuu uuuu uuuu CCP1CON --00 0000 --00 0000 --uu uuuu RCSTA 0000 000x 0000 000x uuuu uuuu Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’, q = value depends on condition Note 1: One or more bits in INTCON, PIR1 and PR2 will be affected (to cause wake-up). 2: When the wake-up is due to an interrupt and the GIE bit is set, the PC is loaded with the interrupt vector (0004h). 3: See Table 15-3 for Reset value for specific condition. |
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