PIC18F2420-I/SP Microchip Technology Inc., PIC18F2420-I/SP Datasheet - Page 124
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PIC18F2420-I/SP
Manufacturer Part Number
PIC18F2420-I/SP
Description
28 Pin, 16 KB Flash, 768 RAM, 25 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F2420-ISP.pdf
(388 pages)
Specifications of PIC18F2420-I/SP
A/d Inputs
10-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
25
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
28-pin SPDIP
Programmable Memory
16K Bytes
Ram Size
768 Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
PIC18F2420-I/SP
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
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- Download datasheet (7Mb)
PIC18F2220/2320/4220/4320
12.1
Timer1 can operate in one of these modes:
• As a timer
• As a synchronous counter
• As an asynchronous counter
The operating mode is determined by the Clock Select
bit, TMR1CS (T1CON<1>).
FIGURE 12-1:
FIGURE 12-2:
DS39599C-page 122
Note 1: When enable bit T1OSCEN is cleared, the inverter and feedback resistor are turned off. This eliminates power drain.
Note 1: When enable bit T1OSCEN is cleared, the inverter and feedback resistor are turned off. This eliminates power drain.
T1CKI/T1OSO
T1CKI/T1OSO
Timer1 Operation
TMR1IF
Overflow
Interrupt
Flag bit
Data Bus<7:0>
Write TMR1L
Read TMR1L
TMR1IF
Overflow
Interrupt
Flag bit
T1OSI
T1OSI
TIMER1 BLOCK DIAGRAM
TIMER1 BLOCK DIAGRAM: 16-BIT READ/WRITE MODE
8
T1OSC
High Byte
TMR1H
Timer 1
8
TMR1H
T1OSC
8
TMR1
TMR1
Oscillator
T1OSCEN
Enable
T1OSCEN
Enable
Oscillator
TMR1L
TMR1L
8
CLR
(1)
(1)
CLR
Internal
Clock
F
OSC
Clock
Internal
F
/4
TMR1ON
OSC
CCP Special Event Trigger
On/Off
TMR1CS
/4
TMR1ON
CCP Special Event Trigger
When TMR1CS = 0, Timer1 increments every instruc-
tion cycle. When TMR1CS = 1, Timer1 increments on
every rising edge of the external clock input, or the
Timer1 oscillator, if enabled.
When the Timer1 oscillator is enabled (T1OSCEN is
set), the RC1/T1OSI/CCP2 and RC0/T1OSO/T1CKI
pins become inputs. The TRISC1:TRISC0 values are
ignored and the pins read as ‘0’.
Timer1 also has an internal “Reset input”. This Reset
can be generated by the CCP module (see
Section 15.4.4 “Special Event Trigger”).
1
0
on/off
TMR1CS
1
0
T1CKPS1:T1CKPS0
T1SYNC
Prescaler
1, 2, 4, 8
T1CKPS1:T1CKPS0
T1SYNC
0
1
Prescaler
1, 2, 4, 8
2
1
0
2
2003 Microchip Technology Inc.
Synchronized
Clock Input
Peripheral Clocks
Synchronized
Synchronize
Clock Input
Peripheral Clocks
Synchronize
det
det
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