PIC18C242/JW Microchip Technology, PIC18C242/JW Datasheet - Page 100

• Manufacturer Part Number: PIC18C242/JW
• Description: IC MCU EPROM 8KX16 A/D 28CDIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C242/JW

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: EPROM, UV
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• 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: -

PIC18CXX2
10.1
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 10-1:
FIGURE 10-2:
DS39206C-page 98
Note 1: When enable bit T1OSCEN is cleared, the inverter and feedback resistor are turned off. This eliminates power drain.
T13CKI/T1OSO
Note 1: When enable bit T1OSCEN is cleared, the inverter and feedback resistor are turned off. This eliminates power drain.
T1CKI/T1OSO
Timer1 Operation
T1OSI
TMR1IF
Overflow
Interrupt
Flag bit
TMR1IF
Overflow
Interrupt
Flag bit
Data Bus<7:0>
Write TMR1L
Read TMR1L
T1OSI
TIMER1 BLOCK DIAGRAM
TIMER1 BLOCK DIAGRAM: 16-BIT READ/WRITE MODE
8
T1OSC
TMR1H
High Byte
TMR1H
T1OSC
Timer 1
8
8
TMR1
T1OSCEN
Enable
Oscillator
TMR1
Oscillator
Enable
T1OSCEN
TMR1L
TMR1L
CLR
8
(1)
(1)
CLR
Clock
Internal
F
OSC
/4
TMR1ON
CCP Special Event Trigger
Clock
Internal
F
On/Off
OSC
TMR1CS
/4
1
0
TMR1ON
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 and RC0/T1OSO/T1CKI pins
become inputs. That is, the TRISC<1:0> value is
ignored.
Timer1 also has an internal “RESET input”. This
RESET can be generated by the CCP module
(Section 13.0).
CCP Special Event Trigger
On/Off
TMR1CS
T1CKPS1:T1CKPS0
1
0
T1SYNC
Prescaler
1, 2, 4, 8
T1CKPS1:T1CKPS0
0
1
T1SYNC
Prescaler
1, 2, 4, 8
2
0
1
2
Synchronized
2001 Microchip Technology Inc.
Clock Input
Synchronize
SLEEP Input
Synchronized
Clock Input
det
Synchronize
SLEEP Input
det