PC87591L datasheet(212/437 Pages) NSC

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Embedded Controller Modules (Continued)

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Revision 1.07

Low-Power Threshold Comparison Mode (ACMMOD = 112)

1. Set the desired threshold value in bits THRSHD(5-0) in THRDAT register.

2. Start a new periodic, low-power threshold comparison by setting START in ACMCTS register to 1.

3. When there is an input under (or over) threshold event, software can detect the event by waiting for OVUNTHEV in

ACMCTS register to be set to 1.

4. Read comparison result for inputs 0 to 7 by reading bits CMPIN(0-7) in CMPRES register.

5. Clear the event flag (release the ACM interrupt if enabled) by writing 1 to OVUNTHEV in ACMCTS register.

Polling Driven Operation. Valid measurement results may be retrieved by polling the event flags in ACMCTS register,

EOMEV, EOCEV or OVUNTHEV, according to the selected operation mode. After reading the relevant data, clear the polled

event flag by writing 1.

Interrupt Driven Operation. When receiving an active ACM interrupt request, the software should check the two event

flags, EOMEV or OVUNTHEV, to identify the source of the interrupt. After reading the relevant data, clear (by setting to 1)

the event flag that caused the interrupt. Clearing the flag releases the ACM interrupt request.

4.14.5 ACM Registers

The ACM control/status and data out register set interfaces with the core through the Peripheral bus.

For a summary of the abbreviations used for Register Type, see “Register Abbreviations and Access” on page 34.

ACM Register Map

The ACM register set contains four control and status registers and nine data out registers.

Table 27. ACM Register Map

Mnemonic

Type

ACMCTS

ACM Control and Status

Varies per bit

ACMCNF

ACM Conﬁguration

R/W

ACMTIM

ACM Timing Control

R/W

THRDAT

Comparison Threshold Data

R/W

CMPRES

Comparison Result

Reserved

VOLDAT0

Voltage Level Data - Input 0

VOLDAT1

Voltage Level Data - Input 1

VOLDAT2

Voltage Level Data - Input 2

VOLDAT3

Voltage Level Data - Input 3

VOLDAT4

Voltage Level Data - Input 4

VOLDAT5

Voltage Level Data - Input 5

VOLDAT6

Voltage Level Data - Input 6

VOLDAT7

Voltage Level Data - Input 7

PC87591L Datasheet(PDF) 212 Page - National Semiconductor (TI)

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