PIC18C242-I/SP Microchip Technology, PIC18C242-I/SP Datasheet - Page 23

• Manufacturer Part Number: PIC18C242-I/SP
• Description: IC MCU OTP 8KX16 A/D 28DIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C242-I/SP

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Number Of I /o: 22
• Program Memory Type: OTP
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Controller Family/series: PIC18
• No. Of I/o's: 23
• Ram Memory Size: 512Byte
• Cpu Speed: 40MHz
• No. Of Timers: 4
• Processor Series: PIC18C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: MSSP, SPI, I2C, USART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 1 x 16 bit
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: ICE2000, DM163022, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: I3DB18C452 - BOARD DAUGHTER ICEPIC3
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

2.6.2
The PIC18CXX2 devices contain circuitry to prevent
"glitches" when switching between oscillator sources.
Essentially, the circuitry waits for eight rising edges of
the clock source that the processor is switching to. This
ensures that the new clock source is stable and that it’s
pulse width will not be less than the shortest pulse
width of the two clock sources.
FIGURE 2-8:
The sequence of events that takes place when switch-
ing from the Timer1 oscillator to the main oscillator will
depend on the mode of the main oscillator. In addition
to eight clock cycles of the main oscillator, additional
delays may take place.
FIGURE 2-9:
Program Counter
2001 Microchip Technology Inc.
Note 1: T
Internal System
Note 1: Delay on internal system clock is eight oscillator cycles for synchronization.
(OSCCON<0>)
T1OSI
OSC1
Internal
System
Clock
SCS
(OSCCON<0>)
Program
Counter
T1OSI
OSC2
OSC1
Clock
SCS
OST
Q1
OSCILLATOR TRANSITIONS
= 1024T
T
Q2
OSC
PC
Q3
Q3
PC
OSC
Q4
TIMING DIAGRAM FOR TRANSITION FROM OSC1 TO TIMER1 OSCILLATOR
TIMING FOR TRANSITION BETWEEN TIMER1 AND OSC1 (HS, XT, LP)
(drawing not to scale).
Q4
Q1
T
DLY
1
Q1
2
T
T
1
P
3
T
OST
4
Tscs
PC + 2
5
T
OSC
6
PC + 2
7
A timing diagram indicating the transition from the main
oscillator to the Timer1 oscillator is shown in
Figure 2-8. The Timer1 oscillator is assumed to be run-
ning all the time. After the SCS bit is set, the processor
is frozen at the next occurring Q1 cycle. After eight syn-
chronization cycles are counted from the Timer1 oscil-
lator, operation resumes. No additional delays are
required after the synchronization cycles.
If the main oscillator is configured for an external crys-
tal (HS, XT, LP), then the transition will take place after
an oscillator start-up time (T
diagram indicating the transition from the Timer1 oscil-
lator to the main oscillator for HS, XT and LP modes is
shown in Figure 2-9.
1
8
2
Q1
3
Q2
4
T
T
T
SCS
1
Q3
P
5
6
Q4
7
PIC18CXX2
OST
Q1
Q1
8
) has occurred. A timing
Q2 Q3
Q2
PC + 4
DS39026C-page 21
Q3
Q4
Q1 Q2
Q4
PC + 6
Q1
Q3