DV164136 Microchip Technology, DV164136 Datasheet - Page 179

• Manufacturer Part Number: DV164136
• Description: DEVELOPMENT KIT FOR PIC18
• Manufacturer: Microchip Technology
• Series: PIC®r
• Type: MCUr

Specifications of DV164136

• Contents: Board, Cables, CDs, PICkit™ 3 Programmer, Power Supply
• Processor To Be Evaluated: PIC18F8722, PIC18F87J11
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3.3 V, 5 V
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18F8xxx
• Kit Contents: PIC18 Exp Brd PICkit 3 Cable CD PSU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC18F8722, PIC18F87J11
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

16.0
The Timer4 timer module has the following features:
• 8-bit Timer register (TMR4)
• 8-bit Period register (PR4)
• Readable and writable (both registers)
• Software programmable prescaler (1:1, 1:4, 1:16)
• Software programmable postscaler (1:1 to 1:16)
• Interrupt on TMR4 match of PR4
Timer4 has a control register shown in Register 16-1.
Timer4 can be shut off by clearing control bit, TMR4ON
(T4CON<2>), to minimize power consumption. The
prescaler and postscaler selection of Timer4 are also
controlled by this register. Figure 16-1 is a simplified
block diagram of the Timer4 module.
REGISTER 16-1:
© 2008 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6-3
bit 2
bit 1-0
U-0
—
TIMER4 MODULE
Unimplemented: Read as ‘0’
T4OUTPS<3:0>: Timer4 Output Postscale Select bits
0000 = 1:1 Postscale
0001 = 1:2 Postscale
•
•
•
1111 = 1:16 Postscale
TMR4ON: Timer4 On bit
1 = Timer4 is on
0 = Timer4 is off
T4CKPS<1:0>: Timer4 Clock Prescale Select bits
00 = Prescaler is 1
01 = Prescaler is 4
1x = Prescaler is 16
T4OUTPS3
R/W-0
T4CON: TIMER4 CONTROL REGISTER
W = Writable bit
‘1’ = Bit is set
T4OUTPS2
R/W-0
T4OUTPS1
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
T4OUTPS0
R/W-0
16.1
Timer4 can be used as the PWM time base for the
PWM mode of the CCP modules. The TMR4 register is
readable and writable and is cleared on any device
Reset. The input clock (F
of 1:1, 1:4 or 1:16, selected by control bits
T4CKPS<1:0> (T4CON<1:0>). The match output of
TMR4 goes through a 4-bit postscaler (which gives a
1:1 to 1:16 scaling inclusive) to generate a TMR4
interrupt, latched in flag bit, TMR4IF (PIR3<3>).
The prescaler and postscaler counters are cleared
when any of the following occurs:
• a write to the TMR4 register
• a write to the T4CON register
• any device Reset (Power-on Reset, MCLR Reset,
TMR4 is not cleared when T4CON is written.
PIC18F8722 FAMILY
Watchdog Timer Reset or Brown-out Reset)
Timer4 Operation
TMR4ON
R/W-0
OSC
x = Bit is unknown
T4CKPS1
/4) has a prescale option
R/W-0
DS39646C-page 177
T4CKPS0
R/W-0
bit 0