68HC705SB7 datasheet(95/170 Pages) FREESCALE

95 / 170 page

August 27, 1998

GENERAL RELEASE SPECIFICATION

MC68HC05SB7

CURRENT SENSE AMPLIFIER

MOTOROLA

REV 2.1

13-3

CSEN — Current Sense Ampliﬁer Enable

This read/write bit enables the CSA module. Reset clears the CSEN bit.

1 =

CSA block enabled.

0 =

CSA block disabled.

X30, X10 — Current Sense Ampliﬁer Gain Select

These read/write bits enable the respective gain to be selected. See

Table 13-2. Reset clears the X30 and X10 bits.

Table 13-2. Current Sense Ampliﬁer Gain Select

CSCAL — Current Sense Ampliﬁer Calibration Enable

This read/write bit enables the CSA calibration. Reset clears the CSCAL bit.

1 =

CSA calibration enabled; current ampliﬁer input connected to

ground (VSS).

0 =

CSA calibration disabled; current ampliﬁer input from CSA pin.

CDEN — Current Detect Enable

This read/write bit enables the current detect comparator and current detect

output pin (CS0 or CS1) logic. Reset clears the CDEN bit.

1 =

Current detect comparator enabled.

0 =

Current detect comparator disabled.

CDIE — Current Detect Interrupt Enable

This read/write bit enables interrupts caused by detecting the current passing

through the sensing resistor, RSENSE. Reset clears the CDIE bit.

1 =

Current detect interrupt enabled.

0 =

Current detect interrupt disabled.

CDIFR — Current Detect Interrupt Flag Reset

Writing a logic “1” to this write-only bit clears the CDIF bit. CDIFR always reads

as a logic zero. Reset does not affect CDIFR.

1 =

Clear CDIF bit.

0 =

No affect on CDIF bit.

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

CSSCR

CSEN

X30

X10

CSCAL

CDEN

CDIE

CDIF

$000A

CDIFR

reset:

00000000

Figure 13-2. CSA Status and Control Register (CSSCR)

X30

X10

GAIN SELECTED

Don’t care

X10

X30

Undetermined

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