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Rotating Clock Divider

Eurorack Module User Manual (updated Sept 2015)

PCB version 1.2 (released November 2014)

Firmware version 1.1 (released April 2012)

4ms Pedals

Features

•Divide-by-1 to Divide-by-64, on 8 output jacks

•CV Rotate jack to shift divide-by amount on all jacks

•CV Reset to reset/re-sync all jacks

•Jumpers or optional break-out panel:

◦Select auto-reset

◦Select "Spread" mode

◦Select maximum divide-by amount (8/16/32/64)

◦Gate or Trigger outputs

◦Count-up or Count-down mode

•ISP header

◦Connects to in-circuit programmer such as AVR ISP MKII for reprogramming code

•Maximum input frequency 3kHz

•LED dimmer trimpot allows you to set a custom LED brightness

•Bus Clock support (slave only). Clock can be taken from the Gate pins on the power

header.

•5V Select jumper allows you to power the RCD from either the 12V rail or the 5V rail.

•4 HP Eurorack module

•5VSEL Jumper set to INT:

◦33mA maximum power draw from +12V rail

◦0mA max on the +5V rail

◦4mA maximum power draw on the -12V rail

•5VSEL Jumper set to EXT:

◦19mA maximum power draw on the +12V rail

◦14mA max on the +5V rail

◦4mA maximum power draw on the -12V rail

Jacks

•Clock Input (3.5V to 15V clock, rising edge triggered)

•CV Rotate (0V to +5V input)

•CV Reset (3.5V to 15V trigger)

•Divided Clock Outputs (8 jacks):

•Divide-by (1+R)

•Divide-by (2+R)

•Divide-by (3+R)

•Divide-by (4+R)

•Divide-by (5+R)

•Divide-by (6+R)

•Divide-by (7+R)

•Divide-by (8+R)

•..where R is the CV Rotation (0 to 63)

Breakout Header/jumpers

The breakout header on the back of the

PCB has spots for 6 jumper shunts which

enable/disable features and change the

operation of the RCD. You also can attach

an RCD Breakout module, which makes

changing settings convenient and

accessible.

If you don't have an RCD Breakout, you can

set the RCD to operate in a particular mode

by installing certain jumpers, and omitting

others.

Note: The bottom four pins of the breakout

header have been snipped off or have been

omitted at the factory.

Counting Up/Down:

Up/

Down

Mode

on Down counting

off Up counting

Trigger/Gate:

Trig/

Gate

Mode

on Gate

off Trigger

Auto-Reset:

Auto-

Reset

Jumper

Auto-reset amount

with Max-Divide-by range of...

8 16 32 64

on 16 32 64 128

off none none none none

Max Divide-by Range and Spread Mode:

Max-

Divide

Range

Jumpe

Total

Rotatabl

e Divide-

by range

Default Divide-by amount on jacks with no voltage applied to CV Rotate jack

(tables 2-5)

(Applying CV to Rotate jack makes each output increase by 1)

See also Table 5 below

16 32 Spread off Spread on

on on 1 to 8 1, 2, 3, 4, 5, 6, 7, 8 1, 2, 3, 4, 6, 8, 12, 16

on off 1 to 16 9, 10, 11, 12, 13, 14, 15, 16 2, 4, 6, 8, 10, 12, 14, 16

off 1 to 32 17, 18, 19, 20, 21, 22, 23, 24 4, 8, 12, 16, 20, 24, 28, 32on

off off 1 to 64 33, 34, 35, 36, 37, 38, 39, 40 8, 16, 24, 32, 40, 48, 56, 64

Gate/Trigger Mode:

In Trigger mode, the jacks output a pulse width equal to that of the input clock (the pulse width is not multiplied

or divided proportionally to the jack's divide-by amount). This is the default method for pcb v1.0 and v1.0.1,

unless it has been upgraded to v1.0.2 or later firmware.In Gate mode, the width of the output pulses are 50% of

the total wave. For example, the /6 jack will stay ON for 3 clock pulses, and then turn OFF for 3 clock pulses. For

even numbered divisions (/2, /4, /6, /8, etc) the transitions happen on the input clock's rising edge.Point of

interest: In Gate mode, with odd-numbered divisions, the jack will turn ON on a rising edge of the input clock,

and then will turn OFF on a falling edge. For example, the /5 jack ought to stay on for 2.5 clock pulses, meaning

it should go OFF somewhere between the rising edge of clock pulses 2 and 3. Right in between these is the

falling edge of pulse number 2, so we can safely call it 2.5!

When in Gate mode, the difference between Up and down-counting is that the gates are inverted.

Up-beat/Down-beat counting:

In Up-beat counting, each jack fires after "N" number of pulses are counted on the input jack (where N is the

divide-by-number). So, after a Reset pulse, on the first clock pulse. On only the /1 jack will fire after a Reset

the next clock pulse, the /1 and the /2 jack will fire, then on the next pulse the /1 and /3 jacks will fire, etc...

In Down-counting, each jack fires when its count is 1. So all the jacks will fire after a Reset pulse, and then

count up to "N", and fire again when they start over at 1. This is called "down-beat counting" because all the

jacks fire on the down-beat (first clock pulse).

Clock outputs (up-beat counting):

IN: 2 3 4 5 6 7 8 10 11 12 13 14 15 16 18 19 20 21 22 23 24 26 27 28 29 30 31 321 9 17 25

...

Clock outputs (down-beat counting):

IN: 2 3 4 5 6 7 8 10 11 12 13 14 15 16 18 19 20 21 22 23 24 26 27 28 29 30 31 321 9 17 25

Spread mode:

Spread mode causes the output to "spread" evenly amongst the entire max division range. See the "Jumper 3,

4, and 5" table on the previous page. For instance, if Max-Div is set to 32, then in spread mode the jacks will

output divisions evenly spaced from 1 to 32 (pus whatever rotation is applied). Since there are 8 jacks spread

over 32 values, each jacks will always be offset by 4 divisions from its neighbors. See Table 4. For example:

With no CV at the Rotate jack, the jacks will output:

/4, /8, /12, /16, /20, /24, /28, /32

Applying a small amount of CV to the Rotate jack will make each jack increment by 1:

/5, /9, /13, /17, /21, /25, /29, /1

Applying more CV Rotation will shift them further. Note how the difference between each jack is 4.

/6, /10, /14, /18, /22, /26, /30, /2

A different thing happens when Max-Divide-by is set to 8. In this case, the jacks will only output standard

"musical" divisions of triplets and sixteenth-notes:

/1, /2, /3, /4, /6, /8, /12, /16

Adding a little bit of CV Rotation will shift the outputs to

/2, /3, /4, /6, /8, /12, /16, /1

Adding more Rotation will shift them more.

/3, /4, /6, /8, /12, /16, /1, /2

In all cases, the outputs will be limited to these "musical" divisions with Spread On and Max-Div at 8

Produktspecifikationer

Varumärke:	4ms
Kategori:	Inte kategoriserad
Modell:	Rotating Clock Divider
Färg på produkten:	Zilver
Vikt:	145 g
Bredd:	84 mm
Djup:	131 mm
Höjd:	16 mm
Sladdlängd:	0.6 m
Förpackningens vikt:	280 g
Förpackningens bredd:	41 mm
Djuppackning:	183 mm
Förpackningshöjd:	152 mm
LED-indikatorer:	Ja
Medföljande kablar:	USB
Integrerad minneskortläsare:	Nee
Antal USB 2.0-portar:	1
Certifiering:	ROHS, CE, FCC
Gränssnitt:	USB 2.0/SATA
Förvaringstemperatur:	-20 - 75 °C
Kompatibla operativsystem:	Woin 2000/XP/Vista/7\nMAC OS 9.x/10.x\nLinux\nUnix
Strömförsörjning via USB:	Ja
Dataöverföringshastigheter som stöds:	480 Mbps
Storlek på lagringsdisk:	2.5 "
Gränssnitt för lagringsenheter som stöds:	SATA
Chipset:	SunplusIT SPIF301
Drifttemperatur (TT):	0 - 70 °C
Relativ luftfuktighet i drift (VV):	10 - 90 procent