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Chapter 6. USART Demo – PIC17C42
6.2
Service_pref and Service_recv Routines
The routines Service_pref and Service_recv are the peripheral
interrupt service routines. When an interrupt occurs, the program goes to
Service_pref . Interrupts are disabled, and the receive buffer is checked. If
it is not full, interrupts are re-enabled and routine returns to the main program.
If the buffer is full, then Service_recv is called. This routine outputs the
buffer data to the LEDs, clears the interrupts and then re-enables the receive
interrupt.
Disable Peripheral Interrupts
No
RX Buffer Full?
Yes
Clear Receive Buffer
( Service_recv )
Enable Peripheral Interrupts
Return
Figure 6.3: Service_pref Routine
Disable Peripheral Interrupts
Output Data to LEDs
Clear Interrupts
Enable Reciever Interrupt
Return
Figure 6.4: Service_recv Routine
? 1999 Microchip Technology Inc.
DS33015C-page 37
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