User manual

PICkit™ Serial Analyzer User’s Guide
DS51647A-page 112 © 2007 Microchip Technology Inc.
B.7 FUNCTIONS
B.7.1 Ping-Pong Display
The PING-PONG display is useful in testing the four LEDs which are illuminated
individually and in sequence as seen below. The following pattern is executed at a
100-millisecond step interval.
FIGURE B-6: PING-PONG LED PATTERN
B.7.2 Timer1 Test
Timer1 Test provides a basic test of the auxiliary clock used for the RTC. The 28-Pin
Demo Board employs a 32 kHz crystal on TIMER1 LP Oscillator to provide a 1-second
interval for the RTC emulated device. The test begins by clearing the one-second flag,
then waits a maximum of 1.1 seconds to see if the flag is reset. Alternatively, the HOST
can test the RTC clock by examining EXEC REGISTER 0x02 at logically timed
intervals.
FIGURE B-7: TIMER1 TEST
DS1 DS2 DS3 DS3
On Off Off Off
Off On Off Off
Off Off On Off
Off Off Off On
Off Off On Off
Off On Off Off
On Off Off Off
Write 0x81 to
EXEC_REG_00
ERROR?
EXEC_REG_03[bit 6]
BUSY?
EXEC_REG_03[bit 7]
NO
NO
YES
YES
PASSED
FAILED