PIC16F887-I/PT Microchip Technology Inc., PIC16F887-I/PT Datasheet - Page 83
PIC16F887-I/PT
Manufacturer Part Number
PIC16F887-I/PT
Description
MCU, 8-Bit, 8KW Flash, 368 RAM, 36 I/O, TQFP-44
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F887-IPT.pdf
(288 pages)
Specifications of PIC16F887-I/PT
A/d Inputs
14-Channel, 10-Bit
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
256 Bytes
Frequency
20 MHz
Input Output
35
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
44-pin TFQP
Programmable Memory
14K Bytes
Ram Size
368 Bytes
Resistance, Drain To Source On
Bytes
Serial Interface
MSSP or EUSART
Speed
20 MHz
Timers
2-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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7.0
The Timer2 module is an eight-bit timer with the
following features:
• 8-bit timer register (TMR2)
• 8-bit period register (PR2)
• Interrupt on TMR2 match with PR2
• Software programmable prescaler (1:1, 1:4, 1:16)
• Software programmable postscaler (1:1 to 1:16)
See Figure 7-1 for a block diagram of Timer2.
7.1
The clock input to the Timer2 module is the system
instruction clock (F
Timer2 prescaler, which has prescale options of 1:1,
1:4 or 1:16. The output of the prescaler is then used to
increment the TMR2 register.
The values of TMR2 and PR2 are constantly compared
to determine when they match. TMR2 will increment
from 00h until it matches the value in PR2. When a
match occurs, two things happen:
• TMR2 is reset to 00h on the next increment cycle
• The Timer2 postscaler is incremented
The match output of the Timer2/PR2 comparator is
then fed into the Timer2 postscaler. The postscaler has
postscale options of 1:1 to 1:16 inclusive. The output of
the Timer2 postscaler is used to set the TMR2IF
interrupt flag bit in the PIR1 register.
FIGURE 7-1:
© 2007 Microchip Technology Inc.
TIMER2 MODULE
Timer2 Operation
F
OSC
/4
OSC
TIMER2 BLOCK DIAGRAM
/4). The clock is fed into the
T2CKPS<1:0>
1:1, 1:4, 1:16
Prescaler
2
PIC16F882/883/884/886/887
Comparator
Preliminary
TMR2
PR2
EQ
Reset
The TMR2 and PR2 registers are both fully readable
and writable. On any Reset, the TMR2 register is set to
00h and the PR2 register is set to FFh.
Timer2 is turned on by setting the TMR2ON bit in the
T2CON register to a ‘1’. Timer2 is turned off by clearing
the TMR2ON bit to a ‘0’.
The Timer2 prescaler is controlled by the T2CKPS bits
in the T2CON register. The Timer2 postscaler is
controlled by the TOUTPS bits in the T2CON register.
The prescaler and postscaler counters are cleared
when:
• A write to TMR2 occurs.
• A write to T2CON occurs.
• Any device Reset occurs (Power-on Reset, MCLR
Reset, Watchdog Timer Reset, or Brown-out
Reset).
Note:
TOUTPS<3:0>
Postscaler
1:1 to 1:16
Output
TMR2
TMR2 is not cleared when T2CON is
written.
4
Sets Flag
bit TMR2IF
DS41291D-page 81
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