PCM18XK1 Microchip Technology, PCM18XK1 Datasheet - Page 162
PCM18XK1
Manufacturer Part Number
PCM18XK1
Description
MODULE PROC PIC18F8680,6680,8565
Manufacturer
Microchip Technology
Datasheet
1.PCM18XK1.pdf
(496 pages)
Specifications of PCM18XK1
Accessory Type
Processor Module
Lead Free Status / RoHS Status
Not applicable / Not applicable
For Use With/related Products
ICE2000
For Use With
ICE2000 - EMULATOR MPLAB-ICE 2000 POD
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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PIC18F6585/8585/6680/8680
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:
DS30491C-page 160
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.
T13CKI/T1OSO
T13CKI/T1OSO
Timer1 Operation
TMR1IF
Overflow
Interrupt
Flag bit
Data Bus<7:0>
Write TMR1L
Read TMR1L
T1OSI
TMR1IF
Overflow
Interrupt
Flag Bit
T1OSI
TIMER1 BLOCK DIAGRAM
TIMER1 BLOCK DIAGRAM: 16-BIT READ/WRITE MODE
8
T1OSC
T1OSC
High Byte
TMR1H
Timer 1
8
TMR1H
8
TMR1
Oscillator
Enable
TMR1
T1OSCEN
T1OSCEN
Enable
Oscillator
TMR1L
TMR1L
8
(1)
CLR
(1)
CLR
Clock
F
Internal
OSC
Clock
F
Internal
OSC
/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 and RC0/T1OSO/T13CKI pins
become inputs. That is, the TRISC<1:0> value is
ignored and the pins are read as ‘0’.
Timer1 also has an internal “Reset input”. This Reset
can be generated by the CCP module (Section 15.0
“Capture/Compare/PWM (CCP) Modules”).
/4
On/Off
TMR1ON
CCP Special Event Trigger
TMR1CS
On/Off
TMR1CS
1
0
1
0
T1CKPS1:T1CKPS0
T1CKPS1:T1CKPS0
T1SYNC
Prescaler
1, 2, 4, 8
T1SYNC
Prescaler
1, 2, 4, 8
0
1
0
1
2
2
2004 Microchip Technology Inc.
Synchronized
Clock Input
Synchronized
Synchronize
Sleep Input
Clock Input
Synchronize
Sleep Input
det
det
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