User manual

28-Pin Demo Board I

C™ Demonstration Firmware

B.7.3 ADC Display

The ADC Display begins by displaying hex values 0x0A, 0x0D and 0x0C in sequence

to signify “ADC” test.

After the opening display sequence, the LEDs displays the Most Significant 4 bits of the

ADC result measuring channel AN0 (potentiometer RP1). As RP1 is manually turned

from one extreme to the other, the LED display should range from binary 0000 to 1111.

The firmware must be forced from this mode by command or Reset.

B.7.4 RTC Display

The RTC Display displays the Least Significant 4 bits of EXEC_REG_02 (RTC SEC-

ONDS). The LEDs should be seen to increment once per second in a binary progres-

sion (0x0-0xF) three times, then (0x0-0xB) once as the RTC SECONDS value

increments from 0x00 to 0x3B (59 decimal). The firmware must be forced from this

mode by command or Reset.

B.7.5 Communications Connector Display

This feature displays the state of the 4 signal pins on the communications connector.

LED1: PIN 1 (AUX1)

LED2: PIN 4 (SDA)

LED3: PIN 5 (SCL)

LED4: PIN 6 (AUX2)

Normally, LED2 and LED3 should be illuminated if the I

C bus has active pull-ups and

the SCK is not held low. The firmware must be forced from this mode by command or

Reset.

B.7.6 RESET Display

The RESET Display is executed on Reset/power-up or by command. The sequence is

a series of individual displays as follows:

1. PING-PONG display: cycles: 2 (i.e., LED1,2,3,4,3,2,1,2,3,4,3,2,1)

2. Blink all LEDs in unison: cycles: 1 (i.e., 1 sec OFF, 1 sec ON, 1 sec OFF)

3. ADC display (described above): cycles: perpetual

B.7.7 1 Second Blink

Blink all LEDs in unison at 1-second intervals (i.e., 1 sec OFF, 1 sec ON, 1 sec

OFF),...This feature uses time based on the Timer1 low-power oscillator and external

32 kHz tuning fork crystal.