PIC18C801-I/L Microchip Technology, PIC18C801-I/L Datasheet - Page 24

• Manufacturer Part Number: PIC18C801-I/L
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,LDCC,84PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C801-I/L

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Type: ROMless
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 84-PLCC
• Processor Series: PIC18C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 1.5 KB
• Interface Type: 3-Wire, I2C, SPI, USART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 47
• Number Of Timers: 1 x 16 bit
• 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: DV164005, ICE4000, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164310 - MODULE SKT FOR PM3 84PLCCXLT84L1 - SOCKET TRANSITION ICE 84PLCCAC174012 - MODULE SKT PROMATEII 84PLCC
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC18C801-I/LR; PIC18C801-I/LR; PIC18C801I/L

PIC18C601/801
2.6
PIC18C601/801 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 PIC18C601/801 devices, this alternate clock
source is the Timer1 oscillator. If a low frequency crys-
tal (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
execution mode. Figure 2-5 shows a block diagram of
the system clock sources.
FIGURE 2-5:
DS39541A-page 24
Note: I/O pins have diode protection to V
Oscillator Switching Feature
OSC2
OSC1
T1OSO
T1OSI
DEVICE CLOCK SOURCES
Main Oscillator
Timer 1 Oscillator
PIC18C601/801
Advance Information
DD
SLEEP
and V
T1OSCEN
Enable
Oscillator
SS
.
Clock Source option
for other modules
4 x PLL
T
2.6.1
The system clock source switching is performed under
software control. The system clock switch bit, SCS0
(OSCCON register), controls the clock switching. When
the SCS0 bit is ’0’, the system clock source comes from
the main oscillator, selected by the FOSC2:FOSC0 con-
figuration bits in CONFIG1H register. When the SCS0 bit
is set, the system clock source will come from the Timer1
oscillator. The SCS0 bit is cleared on all forms of RESET.
T
T
OSC
1
Note:
P
T
OSC
The Timer1 oscillator must be enabled to
switch the system clock source. The
Timer1 oscillator is enabled by setting the
T1OSCEN bit in the Timer1 control register
(T1CON). If the Timer1 oscillator is not
enabled, any write to the SCS0 bit will be
ignored (SCS0 bit forced cleared) and the
main oscillator will continue to be the sys-
tem clock source.
SYSTEM CLOCK SWITCH BIT
/4
Source
Clock
2001 Microchip Technology Inc.
T
SCLK