PIC18F23K22-ESLASHML datasheet(329/496 Pages) MICROCHIP

329 / 496 page

 2010 Microchip Technology Inc.

Preliminary

DS41412C-page 329

PIC18(L)F2X/4XK22

19.9

Effects of a Reset on CTMU

Upon Reset, all registers of the CTMU are cleared. This

leaves the CTMU module disabled, its current source is

turned off and all configuration options return to their

default settings. The module needs to be re-initialized

following any Reset.

If the CTMU is in the process of taking a measurement at

the time of Reset, the measurement will be lost. A partial

charge may exist on the circuit that was being measured,

and should be properly discharged before the CTMU

makes subsequent attempts to make a measurement.

The circuit is discharged by setting and then clearing the

IDISSEN bit (CTMUCONH<1>) while the A/D Converter

is connected to the appropriate channel.

19.10 Registers

There are three control registers for the CTMU:

• CTMUCONH

• CTMUCONL

• CTMUICON

The

CTMUCONH

and

CTMUCONL

registers

(Register 19-1 and Register 19-2) contain control bits

for configuring the CTMU module edge source selec-

tion, edge source polarity selection, edge sequencing,

A/D trigger, analog circuit capacitor discharge and

enables. The CTMUICON register (Register 19-3) has

bits for selecting the current source range and current

source trim.

CTMUCONH: CTMU CONTROL REGISTER 0

R/W-0

U-0

R/W-0

U-0

CTMUEN

—

CTMUSIDL

TGEN

EDGEN

EDGSEQEN

IDISSEN

CTTRIG

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

CTMUEN: CTMU Enable bit

1 = Module is enabled

0 = Module is disabled

bit 6

Unimplemented: Read as ‘0’

bit 5

CTMUSIDL: Stop in Idle Mode bit

1 = Discontinue module operation when device enters Idle mode

0 = Continue module operation in Idle mode

bit 4

TGEN: Time Generation Enable bit

1 = Enables edge delay generation

0 = Disables edge delay generation

bit 3

EDGEN: Edge Enable bit

1 = Edges are not blocked

0 = Edges are blocked

bit 2

EDGSEQEN: Edge Sequence Enable bit

1 = Edge 1 event must occur before Edge 2 event can occur

0 = No edge sequence is needed

bit 1

IDISSEN: Analog Current Source Control bit

1 = Analog current source output is grounded

0 = Analog current source output is not grounded

bit 0

CTTRIG: CTMU Special Event Trigger Control Bit

1 = CTMU Special Event Trigger is enabled

0 = CTMU Special Event Trigger is disabled

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