PIC16F870T-I/SS Microchip Technology, PIC16F870T-I/SS Datasheet - Page 22

• Manufacturer Part Number: PIC16F870T-I/SS
• Description: IC MCU FLASH 2KX14 EE 28SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F870T-I/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SSOP
• For Use With: I3-DB16F871 - BOARD DAUGHTER ICEPIC3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC16F870/871
2.2.2.5
The PIR1 register contains the individual flag bits for
the peripheral interrupts.
REGISTER 2-5:
DS30569B-page 20
Note:
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Interrupt flag bits get set when an interrupt
condition occurs, regardless of the state of
its corresponding enable bit or the global
enable bit, GIE (INTCON<7>). User soft-
ware should ensure the appropriate inter-
rupt bits are clear prior to enabling an
interrupt.
PIR1 Register
PIR1 REGISTER (ADDRESS: 0Ch)
bit 7
PSPIF
1 = A read or a write operation has taken place (must be cleared in software)
0 = No read or write has occurred
ADIF: A/D Converter Interrupt Flag bit
1 = An A/D conversion completed
0 = The A/D conversion is not complete
RCIF: USART Receive Interrupt Flag bit
1 = The USART receive buffer is full
0 = The USART receive buffer is empty
TXIF: USART Transmit Interrupt Flag bit
1 = The USART transmit buffer is empty
0 = The USART transmit buffer is full
Unimplemented: Read as ‘0’
CCP1IF: CCP1 Interrupt Flag bit
Capture mode:
1 = A TMR1 register capture occurred (must be cleared in software)
0 = No TMR1 register capture occurred
Compare mode:
1 = A TMR1 register compare match occurred (must be cleared in software)
0 = No TMR1 register compare match occurred
PWM mode:
Unused in this mode.
TMR2IF: TMR2 to PR2 Match Interrupt Flag bit
1 = TMR2 to PR2 match occurred (must be cleared in software)
0 = No TMR2 to PR2 match occurred
TMR1IF: TMR1 Overflow Interrupt Flag bit
1 = TMR1 register overflowed (must be cleared in software)
0 = TMR1 register did not overflow
Legend:
R = Readable bit
- n = Value at POR
PSPIF
R/W-0
Note 1: PSPIF is reserved on the PIC16F870; always maintain this bit clear.
(1)
(1)
: Parallel Slave Port Read/Write Interrupt Flag bit
R/W-0
ADIF
RCIF
R-0
W = Writable bit
‘1’ = Bit is set
TXIF
R-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U-0
CCP1IF
R/W-0
 2003 Microchip Technology Inc.
x = Bit is unknown
TMR2IF
R/W-0
TMR1IF
R/W-0
bit 0