PIC16F636-I/P Microchip Technology Inc., PIC16F636-I/P Datasheet - Page 59

• Manufacturer Part Number: PIC16F636-I/P
• Description: 14 PIN, 3.5 KB FLASH, 128 RAM, 12 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F636-I/P

• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 12
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 14-pin PDIP
• Programmable Memory: 3.5K Bytes
• Ram Size: 128 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

6.0
The PIC12F635/PIC16F636/639 has a 16-bit timer.
Figure 6-1 shows the basic block diagram of the Timer1
module. Timer1 has the following features:
• 16-bit timer/counter (TMR1H:TMR1L)
• Readable and writable
• Internal or external clock selection
• Synchronous or asynchronous operation
• Interrupt on overflow from FFFFh to 0000h
• Wake-up upon overflow (Asynchronous mode)
• Optional external enable input:
• Optional LP oscillator
FIGURE 6-1:
© 2005 Microchip Technology Inc.
- Selectable gate source: T1G or C2 output
- Selectable gate polarity (T1GINV)
(T1GSS)
OSC1/T1CKI
No CLKOUT
OSC2/T1G
TIMER1 MODULE WITH GATE
CONTROL
T1OSCEN
Note 1: Timer1 increments on the rising edge.
INTOSC
2: C2OUT for PIC16F636/639, C1OUT for PIC12F635.
3: ST Buffer is low-power type when using LP oscillator, or high-speed type when using T1CKI.
Set Flag bit
TMR1IF on
Overflow
TIMER1 ON THE PIC12F635/PIC16F636/639 BLOCK DIAGRAM
TMR1H
Oscillator
TMR1
(1)
TMR1L
PIC12F635/PIC16F636/639
Preliminary
(3)
Internal
Clock
F
OSC
/4
TMR1CS
The Timer1 Control register (T1CON), shown in
Register 6-1, is used to enable/disable Timer1 and
select the various features of the Timer1 module.
1
0
To C2 Comparator Module
TMR1 Clock
Note:
T1CKPS<1:0>
T1SYNC
Prescaler
1, 2, 4, 8
Additional information on timer modules is
available in the “PICmicro
MCU
(DS33023).
0
1
2
C2OUT
Family
TMR1ON
TMR1GE
TMR1ON
TMR1GE
(2)
Synchronized
Clock Input
T1GSS
Sleep Input
Synchronize
1
0
Reference
det
DS41232B-page 57
®
T1GINV
Mid-Range
Manual”