PIC18LF2523-I/SP Microchip Technology, PIC18LF2523-I/SP Datasheet - Page 30

• Manufacturer Part Number: PIC18LF2523-I/SP
• Description: IC PIC MCU FLASH 16KX16 28-DIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18LF2523-I/SP

• Core Size: 8-Bit
• Program Memory Size: 32KB (16K x 16)
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 10x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Controller Family/series: PIC18
• No. Of I/o's: 25
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 1.5KB
• Cpu Speed: 40MHz
• No. Of Timers: 4
• Package: 28SPDIP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 25
• Interface Type: I2C/SPI/USART
• On-chip Adc: 10-chx12-bit
• Number Of Timers: 4
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

oscillator to an alternate low-frequency clock source.
PIC18F2423/2523/4423/4523
2.7
Like previous PIC18 devices, the PIC18LF2423/2523/
4423/4523 family includes a feature that allows the
device clock source to be switched from the main
PIC18LF2423/2523/4423/4523 devices offer two alter-
nate clock sources. When an alternate clock source is
enabled, the various power-managed operating modes
are available.
Essentially, there are three clock sources for these
devices:
• Primary oscillators
• Secondary oscillators
• Internal oscillator block
The primary oscillators include the External Crystal
and Resonator modes, the External RC modes, the
External Clock modes and the internal oscillator block.
The particular mode is defined by the FOSC3:FOSC0
Configuration bits. The details of these modes are
covered earlier in this chapter.
FIGURE 2-8:
DS39755B-page 28
T1OSO
T1OSI
OSC2
OSC1
Clock Sources and Oscillator
Switching
Primary Oscillator
Secondary Oscillator
PIC18LF2423/2523/4423/4523 CLOCK DIAGRAM
OSCCON<6:4>
Oscillator
Internal
Source
Source
INTRC
8 MHz
Block
T1OSCEN
Enable
Oscillator
Sleep
31 kHz (INTRC)
(INTOSC)
8 MHz
OSCTUNE<6>
PIC18F2423/2523/4423/4523
Preliminary
1
0
500 kHz
250 kHz
125 kHz
31 kHz
8 MHz
4 MHz
2 MHz
1 MHz
OSCCON<6:4>
The secondary oscillators are those external sources
not connected to the OSC1 or OSC2 pins. These
sources may continue to operate even after the
controller is placed in a power-managed mode.
PIC18LF2423/2523/4423/4523
Timer1 oscillator as a secondary oscillator. This oscilla-
tor, in all power-managed modes, is often the time base
for functions such as a Real-Time Clock.
Most often, a 32.768 kHz watch crystal is connected
between the RC0/T1OSO/T13CKI and RC1/T1OSI
pins. Like the LP mode oscillator circuit, loading
capacitors are also connected from each pin to ground.
The Timer1 oscillator is discussed in greater detail in
Section 12.3 “Timer1 Oscillator”.
In addition to being a primary clock source, the internal
oscillator block is available as a power-managed
mode clock source. The INTRC source is also used as
the clock source for several special features, such as
the WDT and Fail-Safe Clock Monitor.
The clock sources for the PIC18LF2423/2523/4423/
4523
Section 23.0 “Special Features of the CPU” for
Configuration register details.
OSCTUNE<7>
111
110
101
100
011
010
001
000
4 x PLL
devices
HSPLL, INTOSC/PLL
LP, XT, HS, RC, EC
Internal Oscillator
are
FOSC3:FOSC0
T1OSC
shown
© 2007 Microchip Technology Inc.
Clock Source Option
for other Modules
WDT, PWRT, FSCM
and Two-Speed Start-up
Control
Clock
in
devices
OSCCON<1:0>
Figure 2-8.
Peripherals
IDLEN
offer
CPU
See
the