AC164112 Microchip Technology, AC164112 Datasheet - Page 94

• Manufacturer Part Number: AC164112
• Description: VOLTAGE LIMITER MPLAB ICD2 VPP
• Manufacturer: Microchip Technology

Specifications of AC164112

• Accessory Type: Voltage Limiter
• Product: Cable Assemblies
• Features: Programming And Debugging The Latest PIC12/PIC16/PIC18 Products
• Development Tool Type: Hardware - Eval/Demo Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: MPLAB®
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With: MPLAB ICD 2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC16F72X/PIC16LF72X
FIGURE 7-4:
7.6.4
The external Resistor-Capacitor (RC) modes support
the use of an external RC circuit. This allows the
designer maximum flexibility in frequency choice while
keeping costs to a minimum when clock accuracy is not
required. There are two modes: RC and RCIO.
In RC mode, the RC circuit connects to OSC1.
OSC2/CLKOUT outputs the RC oscillator frequency
divided by 4. This signal may be used to provide a clock
for external circuitry, synchronization, calibration, test
or other application requirements. Figure 7-5 shows
the external RC mode connections.
TABLE 7-1:
DS41341E-page 94
CONFIG1
OSCCON
OSCTUNE
Legend:
Note 1:
Note 1: A series resistor (R
Name
C1
C2 Ceramic
2: The value of R
3: An additional parallel feedback resistor (R
(1)
Resonator
ceramic resonators with low drive level.
selected.
may be required for proper ceramic resonator
operation.
x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by oscillators.
See Configuration Word 1 (Register 8-1) for operation of all bits.
EXTERNAL RC MODES
Bit 7
—
—
—
SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES
R
P
R
(3)
S (1)
CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
F
varies with the Oscillator mode
Bit 6
CP
OSC1/CLKIN
OSC2/CLKOUT
—
—
S
R
) may be required for
F
(2)
MCLRE
IRCF1
TUN5
PIC
Bit 5
®
MCU
To Internal
Logic
Sleep
PWRTE
IRCF0
TUN4
Bit 4
P
)
WDTE
TUN3
Bit 3
ICSL
FOSC2
FIGURE 7-5:
In RCIO mode, the RC circuit is connected to OSC1.
OSC2 becomes an additional general purpose I/O pin.
The RC oscillator frequency is a function of the supply
voltage, the resistor (R
and the operating temperature. Other factors affecting
the oscillator frequency are:
• threshold voltage variation
• component tolerances
• packaging variations in capacitance
The user also needs to take into account variation due
to tolerance of external RC components used.
TUN2
ICSS
Bit 2
R
C
Note 1:
V
Recommended values: 10 kΩ ≤ R
EXT
EXT
SS
V
F
I/O
OSC
DD
(2)
2:
FOSC1
TUN1
Bit 1
/4 or
—
Alternate pin functions are described in
Section 6.1 “Alternate Pin Function”.
Output depends upon RC or RCIO clock mode.
FOSC0
TUN0
Bit 0
OSC1/CLKIN
OSC2/CLKOUT
—
EXT
EXTERNAL RC MODES
© 2009 Microchip Technology Inc.
3 kΩ ≤ R
C
EXT
) and capacitor (C
--10 qq--
--00 0000
POR, BOR
> 20 pF, 2-5V
Value on
PIC
EXT
—
EXT
(1)
®
≤ 100 kΩ, 3-5V
MCU
≤ 100 kΩ, <3V
--10 qq--
--uu uuuu
EXT
Resets
Value on
all other
Internal
Clock
—
) values
(1)