README.rst
1.. _clock_control_xec:
2
3Microchip XEC (MEC15xx/MEC172x) clock control driver sample application
4#######################################################################
5
6Overview
7********
8
9This sample demonstrates configuring the 32KHz clock
10options via device tree. The application prints out
11hardware configuration and exercises some clock control
12driver API's.
13
14Building and Running
15********************
16
17The sample can be built and executed on boards using west.
18No pins configurations, except GPIO014 is used as indicator for entry/exit and
19GPIO060 for 48MHZ PLL clock out.
20GPIO221 alternate function 1 is 32KHZ_OUT and can be monitored on Assembly 6915 JP7 pin 5.
21
22Internal Silicon 32KHz Oscillator jumper configuration
23MEC172x Assembly 6915
24
25 JP1 pin 2 to GND (ground MEC172x XTAL1 pin)
26 JP2 No jumper
27
28Dual-ended 32KHz Crystal jumper configuration
29MEC172x Assembly 6915
30
31 Jumper on JP1 1-2 connect crystal Y1 pin 1 to MEC172x XTAL1
32 Jumper on JP2 2-3 connect crystal Y1 pin 2 to MEC172x XTAL2
33
34MEC172x Assembly 6906 (baseboard)
35
36 Remove jumper on JP121 to prevent U15 32KHz 50% duty waveform
37 from coupling to JP2 on Assembly 6915.
38
39External single-ended 32KHz waveform to MEC172x XTAL2 input
40MEC172x Assembly 6915
41
42 JP1 pin 2 to GND (ground MEC172x XTAL1 pin)
43 Jumper on JP2 1-2 connect external 32KHz signal to XTAL2
44
45MEC172x Assembly 6906 (baseboard)
46
47 Jumper on JP121 pins 3-4 connect U15 32KHz output to
48 XTAL2_32KHZ_IN signal routed to XTAL2 MEC172x pin on Assembly 6915
49
50External single-ended 32KHz waveform to MEC172x 32KHZ_IN pin
51MEC172x Assembly 6915
52
53 JP1 pin 2 to GND (ground MEC172x XTAL1 pin)
54 Remove jumper on JP2
55
56MEC172x Assembly 6906 (baseboard)
57
58 Jumper on JP121 pins 1-2 connect U15 32KHz output to
59 32KHZ_IN pin of MEC172x on Assembly 6915
60
61Sample output
62=============
63
64.. code-block:: console
65
66 Prints MEC172x VBAT and PCR register pertaining to power on status and
67 clock control.
68
