PIC18F252-I/SP Microchip Technology Inc., PIC18F252-I/SP Datasheet - Page 22

• Manufacturer Part Number: PIC18F252-I/SP
• Description: Microcontroller; 32 KB Flash; 1536 RAM; 256 EEPROM; 25 I/O; 28-Pin-SPDIP
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F252-I/SP

• A/d Inputs: 5-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 25
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin SPDIP
• Programmable Memory: 32K Bytes
• Ram Size: 1.5K Bytes
• Speed: 40 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC18FXX2
2.6
The PIC18FXX2 devices include a feature that allows
the system clock source to be switched from the main
oscillator to an alternate low frequency clock source.
For the PIC18FXX2 devices, this alternate clock source
is the Timer1 oscillator. If a low frequency crystal (32
kHz, for example) has been attached to the Timer1
oscillator pins and the Timer1 oscillator has been
enabled, the device can switch to a Low Power Execu-
FIGURE 2-7:
DS39564C-page 20
Oscillator Switching Feature
OSC2
OSC1
T1OSO
T1OSI
DEVICE CLOCK SOURCES
Timer1 Oscillator
Main Oscillator
PIC18FXXX
SLEEP
T1OSCEN
Enable
Oscillator
Clock Source option
for other modules
4 x PLL
tion mode. Figure 2-7 shows a block diagram of the
system clock sources. The clock switching feature is
enabled by programming the Oscillator Switching
Enable (OSCSEN) bit in Configuration Register1H to a
’0’. Clock switching is disabled in an erased device.
See Section 11.0 for further details of the Timer1 oscil-
lator. See Section 19.0 for Configuration Register
details.
T
T
T
OSC
1
P
T
OSC
/4
Source
Clock
© 2006 Microchip Technology Inc.
T
SCLK