PIC18F2450-I/SO Microchip Technology, PIC18F2450-I/SO Datasheet - Page 38

• Manufacturer Part Number: PIC18F2450-I/SO
• Description: IC PIC MCU FLASH 8KX16 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2450-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 16KB (8K x 16)
• Package / Case: 28-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: UART/USART, USB
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 23
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: EUSART/USB
• Maximum Clock Frequency: 48 MHZ
• Number Of Programmable I/os: 23
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DM163014, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• Package: 28SOIC W
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 48 MHz
• A/d Bit Size: 10 bit
• A/d Channels Available: 10
• Height: 2.31 mm
• Length: 17.87 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Width: 7.49 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164322 - MODULE SOCKET MPLAB PM3 28/44QFNDM163025 - PIC DEM FULL SPEED USB DEMO BRD
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F2450/4450
3.2.3
In RC_RUN mode, the CPU and peripherals are
clocked from the internal oscillator; the primary clock is
shut down. When using the INTRC source, this mode
provides the best power conservation of all the Run
modes while still executing code. It works well for user
applications which are not highly timing sensitive or do
not require high-speed clocks at all times.
If the primary clock source is the internal oscillator
(INTRC), there are no distinguishable differences
between the PRI_RUN and RC_RUN modes during
execution. However, a clock switch delay will occur dur-
ing entry to and exit from RC_RUN mode. Therefore, if
the primary clock source is the internal oscillator, the
use of RC_RUN mode is not recommended.
FIGURE 3-3:
FIGURE 3-4:
DS39760C-page 36
Note 1:
Peripheral
Program
Counter
INTRC
OSC1
Clock
Clock
CPU
Note 1:
RC_RUN MODE
CPU Clock
PLL Clock
Peripheral
Program
Counter
Output
INTRC
OSC1
Clock transition typically occurs within 2-4 T
Clock
2:
Q1
SCS1:SCS0 bits Changed
T
Clock transition typically occurs within 2-4 T
OST
Q2
TRANSITION TIMING TO RC_RUN MODE
PC
TRANSITION TIMING FROM RC_RUN MODE TO PRI_RUN MODE
= 1024 T
Q3
Q4
OSC
Q1
Q1
; T
T
1
PLL
OST
= 2 ms (approx). These intervals are not shown to scale.
(1)
PC
2
Q2
Clock Transition
3
T
OSC
PLL
OSTS bit Set
Q3
Preliminary
(1)
.
OSC
PC + 2
(1)
n-1
.
Q4
This mode is entered by setting SCS1 to ‘1’. Although
it is ignored, it is recommended that SCS0 also be
cleared; this is to maintain software compatibility with
future devices. When the clock source is switched to
the INTRC (see Figure 3-3), the primary oscillator is
shut down and the OSTS bit is cleared.
On transitions from RC_RUN mode to PRI_RUN mode,
the device continues to be clocked from the INTRC
while the primary clock is started. When the primary
clock becomes ready, a clock switch to the primary
clock occurs (see Figure 3-4). When the clock switch is
complete, the OSTS bit is set and the primary clock is
providing the device clock. The IDLEN and SCS bits
are not affected by the switch. The INTRC source will
continue to run if either the WDT or the Fail-Safe Clock
Monitor is enabled.
n
Q1
1
Transition
2
Clock
(2)
n-1 n
Q2
PC + 2
Q3
Q2
Q4
© 2007 Microchip Technology Inc.
Q3 Q4
Q1
Q1
PC + 4
Q2
PC + 4
Q2
Q3
Q3