PIC18F4320-I/PT Microchip Technology, PIC18F4320-I/PT Datasheet - Page 24

• Manufacturer Part Number: PIC18F4320-I/PT
• Description: IC MCU FLASH 4KX16 A/D 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4320-I/PT

• Core Size: 8-Bit
• Program Memory Size: 8KB (4K x 16)
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Controller Family/series: PIC18
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 512Byte
• Cpu Speed: 40MHz
• No. Of Timers: 4
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT44PT3 - SOCKET TRAN ICE 44MQFP/TQFPAC164305 - MODULE SKT FOR PM3 44TQFP444-1001 - DEMO BOARD FOR PICMICRO MCUAC164020 - MODULE SKT PROMATEII 44TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC18F2220/2320/4220/4320
2.6
The PIC18F2X20/4X20 devices include an internal
oscillator block that generates two independent clock
signals. Either can be used as the system’s clock
source. This can eliminate the need for external
oscillator circuits on the OSC1 or OSC2 pins.
The main output (INTOSC) is an 8-MHz clock source
that can be used to directly drive the system clock. It
also drives a post-scaler that can provide a range of
clock frequencies from 125 kHz to 4 MHz. The
INTOSC output is enabled when the system clock
frequency is set from 125 kHz to 8 MHz.
The other clock source is the internal RC oscillator
(INTRC) that provides a 31-kHz output. The INTRC
oscillator is enabled by selecting the internal oscillator
block as the system clock source or by enabling any of
the following:
• Power-up Timer
• Fail-Safe Clock Monitor
• Watchdog Timer
• Two-Speed Start-up
These features are discussed in greater detail in
Section 23.0 “Special Features of the CPU”.
The clock source frequency (INTOSC direct, INTRC
direct or INTOSC post-scaler) is selected by configur-
ing
(Register 2-2).
DS39599G-page 22
the
Internal Oscillator Block
IRCF
bits
of
the
OSCCON
register
2.6.1
Using the internal oscillator as the clock source can
eliminate the need for up to two external oscillator pins.
This frees the pins to be used for digital I/O.
Two configurations are available:
• INTIO1 mode – The OSC2 pin outputs FOSC/4
• INTIO2 mode – OSC1 functions as RA7 and
while OSC1 functions as RA7 for digital input and
output.
OSC2 functions as RA6, both for digital input and
output.
INTIO MODES
© 2007 Microchip Technology Inc.