PIC18F87K22-I/PTRSL Microchip Technology Inc., PIC18F87K22-I/PTRSL Datasheet - Page 52

• Manufacturer Part Number: PIC18F87K22-I/PTRSL
• Description: 128kB Flash, 4kB RAM, 1kB EE, nanoWatt XLP, GP, 80 TQFP 12x12x1mm TRAY
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F87K22-I/PTRSL

• A/d Inputs: 24-Channel, 12-Bit
• Comparators: 3
• Cpu Speed: 16 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 69
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 80-pin TQFP
• Programmable Memory: 128K Bytes
• Ram Size: 3.8K Bytes
• Speed: 64 MHz
• Temperature Range: –40 to 125 °C
• Timers: 6-8-bit, 5-16-bit
• Voltage, Range: 1.8-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

signals. Either clock can be used as the microcontroller’s
external oscillator circuit on the OSC1 and/or OSC2 pins.
PIC18F87K22 FAMILY
3.6
The PIC18F87K22 family of devices includes an internal
oscillator block which generates two different clock
clock source, which may eliminate the need for an
The internal oscillator consists of three blocks,
depending on the frequency of operation. They are
HF-INTOSC, MF-INTOSC and LF-INTRC.
In HF-INTOSC mode, the internal oscillator can provide
a frequency ranging from 31 KHz to 16 MHz, with the
postscaler
(IRCF<2:0>).
The INTSRC bit (OSCTUNE<7>) and MFIOSEL bit
(OSCCON2<0>) also decide which INTOSC provides
the lower frequency (500 kHz to 31 KHz). For the
HF-INTOSC to provide these frequencies, INTSRC = 1
and MFIOSEL = 0.
In HF-INTOSC, the postscaler (IRCF<2:0>) provides
the frequency range of 31 kHz to 16 MHz. If
HF-INTOSC is used with the PLL, the input frequency
to the PLL should be 4 MHz to 16 MHz
(IRCF<2:0> = 111, 110 or 101).
For MF-INTOSC mode to provide a frequency range of
500 kHz to 31 kHz, INTSRC = 1 and MFIOSEL = 1.
The postscaler (IRCF<2:0>), in this mode, provides the
frequency range of 31 kHz to 500 kHz.
The LF-INTRC can provide only 31 kHz if INTSRC = 0.
The LF-INTRC provides 31 kHz and is enabled if it is
selected as the device clock source. The mode is
enabled automatically when any of the following are
enabled:
• Power-up Timer
• Fail-Safe Clock Monitor
• Watchdog Timer
• Two-Speed Start-up
These features are discussed in greater detail in
Section 28.0 “Special Features of the
The clock source frequency (HF-INTOSC, MF-INTOSC
or LF-INTRC direct) is selected by configuring the IRCF
bits of the OSCCON register, as well the INTSRC and
MFIOSEL bits. The default frequency on device Resets
is 8 MHz.
3.6.1
Using the internal oscillator as the clock source elimi-
nates the need for up to two external oscillator pins,
which can then be used for digital I/O. Two distinct
oscillator configurations, which are determined by the
FOSC Configuration bits, are available:
• In INTIO1 mode, the OSC2 pin (RA6) outputs
• In INTIO2 mode, OSC1 functions as RA7 and
DS39960C-page 52
F
Figure
OSC2 functions as RA6 (see
are available as digital input and output ports.
OSC
/4, while OSC1 functions as RA7 (see
Internal Oscillator Block
3-8) for digital input and output.
INTIO MODES
deciding
the
Figure
selected
3-9). Both
CPU”.
frequency
FIGURE 3-8:
FIGURE 3-9:
3.6.2
The 4x Phase Lock Loop (PLL) can be used with the
HF-INTOSC to produce faster device clock speeds
than are normally possible with the internal oscillator
sources. When enabled, the PLL produces a clock
speed of 16 MHz or 64 MHz.
PLL operation is controlled through software. The
control bits, PLLEN (OSCTUNE<6>) and PLLCFG
(CONFIG1H<4>), are used to enable or disable its
operation. The PLL is available only to HF-INTOSC.
The other oscillator is set with HS and EC modes. Addi-
tionally, the PLL will only function when the selected
output frequency is either 4 MHz or 16 MHz
(OSCCON<6:4> = 111, 110 or 101).
Like the INTIO modes, there are two distinct INTPLL
modes available:
• In INTPLL1 mode, the OSC2 pin outputs F
• In INTPLL2 mode, OSC1 functions as RA7 and
while OSC1 functions as RA7 for digital input and
output. Externally, this is identical in appearance
to INTIO1
OSC2 functions as RA6, both for digital input and
output. Externally, this is identical to INTIO2
(Figure
F
RA7
RA6
OSC
RA7
/4
3-9).
INTPLL MODES
(Figure
INTIO1 OSCILLATOR MODE
INTIO2 OSCILLATOR MODE
I/O (OSC1)
I/O (OSC2)
3-8).
I/O (OSC1)
OSC2
 2011 Microchip Technology Inc.
PIC18F87K22
PIC18F87K22
OSC
/4,