PC87591L datasheet(211/437 Pages) NSC

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Embedded Controller Modules (Continued)

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Interrupt Structure

The ACM Interrupt is generated to the core if an event from Table 26 becomes active. Since the events are enabled in dif-

ferent ACM operation modes, only one event may occur at a time.

Table 26. ACM Interrupt Structure

When an event flag and its related mask bit are set (enabled), the ACM Interrupt request is asserted. This is indicated by

a high level of the ACM Interrupt signal.

The software must reset the event flag (or its mask bit) to de-assert the ACM Interrupt request.

All the event flags (EOMEV, EOCEV and OVUNTHEV) are cleared by writing 1 to START in ACMCTS register.

The ACM Interrupt is routed both to the ICU and to the MIWU as an ACMI signal (see Section 4.3 on page 98 and Section 4.4

on page 105).

ACM Operating Sequences

The ACM has three operating modes:

●

Voltage Level Burst mode

●

Threshold Comparison Burst mode

●

Low-Power Threshold Comparison mode

After the ACM is properly initialized, one of these modes should be used. The operation sequences are as follows:

Voltage Level Burst Mode (ACMMOD = 012)

1. Start a new burst of eight voltage measurements by setting START bit in ACMCTS register to 1.

2. When End-of-Voltage level measurement burst is reached, software can detect the event by waiting for EOMEV in

ACMCTS register to be set to 1.

3. Read measured voltage level - Input 0, for channel 0, by reading VOLTLVL in VOLDAT0 register.

4. Read measured voltage level - Input 1, for channel 1, by reading VOLTLVL in VOLDAT1 register.

5. Read measured voltage level - Input 2, for channel 2, by reading VOLTLVL in VOLDAT2 register.

6. Read measured voltage level - Input 3, for channel 3, by reading VOLTLVL in VOLDAT3 register.

7. Read measured voltage level - Input 4, for channel 4, by reading VOLTLVL in VOLDAT4 register.

8. Read measured voltage level - Input 5, for channel 5, by reading VOLTLVL in VOLDAT5 register.

9. Read measured voltage level - Input 6, for channel 6, by reading VOLTLVL in VOLDAT6 register.

10. Read measured voltage level - Input 7, for channel 7, by reading VOLTLVL in VOLDAT7 register.

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

Threshold Comparison Burst Mode -(ACMMOD = 102)

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

2. Start a new burst of threshold comparison by setting START in ACMCTS register to 1.

3. When End-of-Threshold comparison burst is reached, software can detect the event by waiting for EOCEV in ACMCTS

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

5. Clear the event flag by writing 1 to EOCEV in ACMCTS register.

Event Flag

Mnemonic

Mask Bit

Mnemonic

Description

EOMEV

ACMCTS

INTEMEN

ACMCNF

End-of-Measurement event and associated interrupt enable

OVUNTHEV ACMCTS

INTOUEN

ACMCNF

Over/Under Threshold event and associated interrupt enable

PC87591L 데이터시트(PDF) 211 Page - National Semiconductor (TI)

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