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P16F877 Datasheet(PDF) 57 Page - Microchip Technology |
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P16F877 Datasheet(HTML) 57 Page - Microchip Technology |
57 / 218 page 2001 Microchip Technology Inc. DS30292C-page 55 PIC16F87X 7.0 TIMER2 MODULE Timer2 is an 8-bit timer with a prescaler and a postscaler. It can be used as the PWM time-base for the PWM mode of the CCP module(s). The TMR2 reg- ister is readable and writable, and is cleared on any device RESET. The input clock (FOSC/4) has a prescale option of 1:1, 1:4, or 1:16, selected by control bits T2CKPS1:T2CKPS0 (T2CON<1:0>). The Timer2 module has an 8-bit period register, PR2. Timer2 increments from 00h until it matches PR2 and then resets to 00h on the next increment cycle. PR2 is a readable and writable register. The PR2 register is initialized to FFh upon RESET. The match output of TMR2 goes through a 4-bit postscaler (which gives a 1:1 to 1:16 scaling inclusive) to generate a TMR2 interrupt (latched in flag bit TMR2IF, (PIR1<1>)). Timer2 can be shut-off by clearing control bit TMR2ON (T2CON<2>), to minimize power consumption. Register 7-1 shows the Timer2 control register. Additional information on timer modules is available in the PICmicro™ Mid-Range MCU Family Reference Manual (DS33023). FIGURE 7-1: TIMER2 BLOCK DIAGRAM REGISTER 7-1: T2CON: TIMER2 CONTROL REGISTER (ADDRESS 12h) Comparator TMR2 Sets Flag TMR2 Reg Output(1) RESET Postscaler Prescaler PR2 Reg 2 FOSC/4 1:1 1:16 1:1, 1:4, 1:16 EQ 4 bit TMR2IF Note 1: TMR2 register output can be software selected by the SSP module as a baud clock. to T2OUTPS3: T2OUTPS0 T2CKPS1: T2CKPS0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 bit 7 bit 0 bit 7 Unimplemented: Read as '0' bit 6-3 TOUTPS3:TOUTPS0: Timer2 Output Postscale Select bits 0000 = 1:1 Postscale 0001 = 1:2 Postscale 0010 = 1:3 Postscale • • • 1111 = 1:16 Postscale bit 2 TMR2ON: Timer2 On bit 1 = Timer2 is on 0 = Timer2 is off bit 1-0 T2CKPS1:T2CKPS0: Timer2 Clock Prescale Select bits 00 = Prescaler is 1 01 = Prescaler is 4 1x = Prescaler is 16 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ - n = Value at POR ’1’ = Bit is set ’0’ = Bit is cleared x = Bit is unknown |
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