PIC16F874-20/L Microchip Technology, PIC16F874-20/L Datasheet - Page 190

• Manufacturer Part Number: PIC16F874-20/L
• Description: IC MCU FLASH 4KX14 EE 44PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F874-20/L

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Controller Family/series: PIC16F
• No. Of I/o's: 33
• Eeprom Memory Size: 128Byte
• Ram Memory Size: 192Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 192 B
• Interface Type: MSSP, PSP, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 33
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163022, DV164120
• Minimum Operating Temperature: 0 C
• On-chip Adc: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164309 - MODULE SKT FOR PM3 44PLCC444-1001 - DEMO BOARD FOR PICMICRO MCUDVA16XL441 - ADAPTER DEVICE ICE 44PLCC309-1040 - ADAPTER 44-PLCC ZIF TO 40-DIP309-1039 - ADAPTER 44-PLCC TO 40-DIPDV007003 - PROGRAMMER UNIVERSAL PROMATE II
• Lead Free Status / Rohs Status: Details

PICmicro MID-RANGE MCU FAMILY
12.11
DS31012A-page 12-10
Initialization
Since Timer1 has a software programmable clock source, there are three examples to show the
initialization of each mode.
Example 12-5
initialization of the external oscillator mode.
Example 12-4:
Example 12-5:
;
; The Timer1 interrupt is disabled, do polling on the overflow bit
;
T1_OVFL_WAIT
;
; Timer has overflowed
;
;
; The Timer1 interrupt is disabled, do polling on the overflow bit
;
T1_OVFL_WAIT
;
; Timer has overflowed
;
CLRF
CLRF
CLRF
CLRF
BSF
CLRF
BCF
CLRF
MOVLW
MOVWF
BSF
BTFSS
GOTO
BCF
CLRF
CLRF
CLRF
CLRF
BSF
CLRF
BCF
CLRF
MOVLW
MOVWF
BSF
BTFSS
GOTO
BCF
T1CON
TMR1H
TMR1L
INTCON
STATUS, RP0
PIE1
STATUS, RP0
PIR1
0x30
T1CON
T1CON, TMR1ON ; Timer1 starts to increment
PIR1, TMR1IF
T1_OVFL_WAIT
PIR1, TMR1IF
T1CON
TMR1H
TMR1L
INTCON
STATUS, RP0
PIE1
STATUS, RP0
PIR1
0x32
T1CON
T1CON, TMR1ON ; Timer1 starts to increment
PIR1, TMR1IF
T1_OVFL_WAIT
PIR1, TMR1IF
shows the initialization for the external clock source, and
Timer1 Initialization (Internal Clock Source)
Timer1 Initialization (External Clock Source)
Example 12-4
; Stop Timer1, Internal Clock Source,
;
; Clear Timer1 High byte register
; Clear Timer1 Low byte register
; Disable interrupts
; Bank1
; Disable peripheral interrupts
; Bank0
; Clear peripheral interrupts Flags
; Internal Clock source with 1:8 prescaler
;
; Stop Timer1, Internal Clock Source,
;
; Clear Timer1 High byte register
; Clear Timer1 Low byte register
; Disable interrupts
; Bank1
; Disable peripheral interrupts
; Bank0
; Clear peripheral interrupts Flags
; External Clock source with 1:8 prescaler
;
;
T1 oscillator disabled, prescaler = 1:1
Timer1 is stopped and T1 osc is disabled
T1 oscillator disabled, prescaler = 1:1
Clock source is synchronized to device
Timer1 is stopped and T1 osc is disabled
shows the initialization for the internal clock source,
1997 Microchip Technology Inc.
Example 12-6
shows the