Datasheet

PIC16C712/716
DS41106C-page 36  1999-2013 Microchip Technology Inc.
6.0 TIMER2 MODULE
The Timer2 module timer has the following features:
• 8-bit timer (TMR2 register)
• 8-bit period register (PR2)
• Readable and writable (both registers)
• Software programmable prescaler (1:1, 1:4, 1:16)
• Software programmable postscaler (1:1 to 1:16)
• Interrupt on TMR2 match of PR2
Timer2 has a control register, shown in Figure 6-1.
Timer2 can be shut off by clearing control bit TMR2ON
(T2CON<2>) to minimize power consumption.
Figure 6-2 is a simplified block diagram of the Timer2
module.
Additional information on timer modules is available in
the PIC
®
Mid-Range Reference Manual, (DS33023).
FIGURE 6-1: T2CON: TIMER2 CONTROL REGISTER (ADDRESS 12h)
FIGURE 6-2: TIMER2 BLOCK DIAGRAM
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 R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
-n = Value at POR Reset
bit7 bit0
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
0011 = 1:4 Postscale
0100 = 1:5 Postscale
0101 = 1:6 Postscale
0110 = 1:7 Postscale
0111 = 1:8 Postscale
1000 = 1:9 Postscale
1001 = 1:10 Postscale
1010 = 1:11 Postscale
1011 = 1:12 Postscale
1100 = 1:13 Postscale
1101 = 1:14 Postscale
1110 = 1:15 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
Comparator
TMR2
Sets flag
TMR2 Reg
output
Reset
Postscaler
Prescaler
PR2 Reg
2
F
OSC/4
1:1 1:16
1:1, 1:4, 1:16
EQ
4
bit TMR2IF
to