Microchip Technology MCP42XX, User Manual, Page: 22 / 46

MCP42XX PICtail™ Plus Daughter Board User’s Guide
DS51759A-page 18
©
2008 Microchip Technology Inc.
10 Depress the Explorer 16 Developer Board’s S6
push button While S6 is depressed, the voltage
on Wiper 1 (VW1) increases
11 Depress the Explorer 16 Developer Board’s S4
push button While S4 is depressed, the voltage
on Wiper 1 (VW1) decreases
12 Use the S4 and S6 push buttons to configure
the volatile wiper 1 register to either near V
DD
or near VSS. Take note of Wiper Voltage value.
—
13 Move Channel 4 scope probe (VW1) to SDO
signal on J1 (see
Figure 2-4
)
—
14 Configure Scope to Capture on Channel 1 (CS
pin) on the rising edge at about 7V. —
15 Depress the Explorer 16 Developer Board’s S5
push button While S5 is depressed, the volatile
Wiper 1 register is read, this value is
written to the Non-Volatile Wiper 1
register, and then approximately a
10ms delay occurs while the NV write
cycle occurs. Capture will look similar
to
Figure 2-7
(Note 1)
16 Unplug Power from the Explorer 16 Developer
Board —
17 Depress the Explorer 16 Developer Board’s S3
push button —
18 Power up the programmed Explorer 16 Devel-
oper Board and depress and release the MCLR
push button —
19 Release the Explorer 16 Developer Board’s S3
push button The voltage on the Wiper 1 pad
(VW1) should be the same voltage
level as when completed with Step
12.
20 Unplug Power from the Explorer 16 Developer
Board and remove the MCP42XXDM-PTPLS
board —
TABLE 2-2: DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO
BOARD (CONTINUED)
Step Action Result
Note 1: The SDI and SCK signals go from V
SS
to approximately 3.3V due to the PIC24
operating at 3.3V. The VW1 signals go from V
SS
to approximately 5V.