PIC16C745/JW Microchip Technology, PIC16C745/JW Datasheet - Page 49
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PIC16C745/JW
Manufacturer Part Number
PIC16C745/JW
Description
IC MCU EPROM8KX14 USB A/D 28CDIP
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16C745-ISP.pdf
(165 pages)
3.PIC16C745-ISP.pdf
(6 pages)
4.PIC16C745-ISP.pdf
(6 pages)
Specifications of PIC16C745/JW
Core Processor
PIC
Core Size
8-Bit
Speed
24MHz
Connectivity
SCI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
14KB (8K x 14)
Program Memory Type
EPROM, UV
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
4.35 V ~ 5.25 V
Data Converters
A/D 5x8b
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
28-CDIP (0.300", 7.62mm) Window
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16C745/JW
Manufacturer:
MICROCHIP
Quantity:
51
Part Number:
PIC16C745/JW
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
8.0
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 (F
1:4 or 1:16, selected by control bits T2CKPS<1:0>
(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 8-1 shows the Timer2 control register.
Additional information on timer modules is available in
the PICmicro™ Mid-Range MCU Family Reference
Manual (DS33023).
REGISTER 8-1: TIMER2 CONTROL REGISTER (T2CON: 12h)
2000 Microchip Technology Inc.
bit7
bit 7:
bit 6-3:
bit 2:
bit 1-0:
U-0
—
TIMER2 MODULE
Unimplemented: Read as '0'
TOUTPS<3:0>: Timer2 Output Postscale Select bits
0000 = 1:1 Postscale
0001 = 1:2 Postscale
0010 = 1:3 Postscale
•
•
•
1111 = 1:16 Postscale
TMR2ON: Timer2 On bit
1 = Timer2 is on
0 = Timer2 is off
T2CKPS<1:0>: Timer2 Clock Prescale Select bits
00 = Prescaler is 1
01 = Prescaler is 4
1x = Prescaler is 16
TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0
R/W-0
INT
/4) has a prescale option of 1:1,
R/W-0
R/W-0
R/W-0
Preliminary
R/W-0
8.1
The prescaler and postscaler counters are cleared
when any of the following occurs:
• a write to the TMR2 register
• a write to the T2CON register
• any device RESET (POR, MCLR Reset, WDT
TMR2 is not cleared when T2CON is written.
FIGURE 8-1:
R/W-0
Reset or BOR)
Sets flag
bit TMR2IF
T2OUTPS<3:0>
1:1
Postscaler
Timer2 Prescaler and Postscaler
to
R/W-0
1:16
4
TMR2
output
PIC16C745/765
RESET
bit0
EQ
TIMER2 BLOCK DIAGRAM
Comparator
R = Readable bit
W = Writable bit
U = Unimplemented bit,
- n = Value at POR reset
TMR2 reg
PR2 reg
read as ‘0’
1:1, 1:4, 1:16
T2CKPS<1:0>
DS41124C-page 49
Prescaler
2
F
INT