PCM18XT0 Microchip Technology, PCM18XT0 Datasheet - Page 161

• Manufacturer Part Number: PCM18XT0
• Description: MODULE PROC PIC18F4685
• Manufacturer: Microchip Technology

Specifications of PCM18XT0

• Accessory Type: Processor Module
• Product: Microcontroller Modules
• Core Processor: PIC18F4685
• 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, Not applicable / Not applicable

14.0
The Timer3 timer/counter module incorporates these
features:
• Software selectable operation as a 16-bit timer or
• Readable and writable 8-bit registers (TMR3H
• Selectable clock source (internal or external) with
• Interrupt on overflow
• Module Reset on CCP1 Special Event Trigger
REGISTER 14-1:
© 2009 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6,3
bit 5-4
bit 2
bit 1
bit 0
Note 1:
counter
and TMR3L)
device clock or Timer1 oscillator internal options
R/W-0
RD16
TIMER3 MODULE
Thess bits and the ECCP1 module are available on PIC18F4682/4685 devices only.
RD16: 16-Bit Read/Write Mode Enable bit
1 = Enables register read/write of Timer3 in one 16-bit operation
0 = Enables register read/write of Timer3 in two 8-bit operations
T3ECCP1:T3CCP1: Timer3 and Timer1 to ECCP1/CCP1 Enable bits
1x = Timer3 is the capture/compare clock source for both CCP1 and ECCP1 modules
01 = Timer3 is the capture/compare clock source for ECCP1;
00 = Timer1 is the capture/compare clock source for both CCP1 and ECCP1 modules
T3CKPS1:T3CKPS0: Timer3 Input Clock Prescale Select bits
11 = 1:8 Prescale value
10 = 1:4 Prescale value
01 = 1:2 Prescale value
00 = 1:1 Prescale value
T3SYNC: Timer3 External Clock Input Synchronization Control bit
(Not usable if the device clock comes from Timer1/Timer3.)
When TMR3CS = 1:
1 = Do not synchronize external clock input
0 = Synchronize external clock input
When TMR3CS = 0:
This bit is ignored. Timer3 uses the internal clock when TMR3CS = 0.
TMR3CS: Timer3 Clock Source Select bit
1 = External clock input from Timer1 oscillator or T13CKI (on the rising edge after the first falling edge)
0 = Internal clock (F
TMR3ON: Timer3 On bit
1 = Enables Timer3
0 = Stops Timer3
T3ECCP1
R/W-0
Timer1 is the capture/compare clock source for CCP1
T3CON: TIMER3 CONTROL REGISTER
(1)
W = Writable bit
‘1’ = Bit is set
T3CKPS1
R/W-0
OSC
/4)
PIC18F2682/2685/4682/4685
T3CKPS0
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
T3CCP1
R/W-0
A simplified block diagram of the Timer3 module is
shown in Figure 14-1. A block diagram of the module’s
operation in Read/Write mode is shown in Figure 14-2.
The Timer3 module is controlled through the T3CON
register (Register 14-1). It also selects the clock source
options
Section 15.1.1
Resources” for more information).
(1)
for
T3SYNC
R/W-0
the
“CCP1
ECCP1/CCP1
(1)
x = Bit is unknown
TMR3CS
Modules
R/W-0
DS39761C-page 161
modules
and
TMR3ON
R/W-0
Timer
bit 0
(see