PC87591L datasheet(105/437 Pages) NSC

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Embedded Controller Modules (Continued)

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4.4

MULTI-INPUT WAKE-UP (MIWU)

The Multi-Input Wake-Up Unit (MIWU) allows the PC87591x to exit Idle mode. In addition, it provides signal conditioning and

grouping of external interrupt sources. It supports a total of 32 internal and/or external wake-up sources.

4.4.1

Features

●

Supports up to 32 internal and/or external wake-up inputs

●

Generates a wake-up signal

●

Generates interrupt signals for:

— each of the 32 inputs

— one interrupt for each group of eight inputs e.g., I/O ports

●

User-selectable trigger condition on each input:

— positive edge

— negative edge

●

Individual enable and pending bits for each input

●

Programmable bypass mode connects inputs to ICU without MIWU involvement

4.4.2

Operation

Overview

The Multi-Input Wake-Up Unit (MIWU) detects a valid software-selectable trigger condition on any of its inputs. On detection

of a valid trigger condition, the MIWU generates a wake-up request and/or an interrupt request. The wake-up request is con-

nected to the Power Management module (PMC) and may be utilized to exit the Idle mode and return to Active mode. The

interrupt requests are used to signal to the Interrupt Control Unit (ICU) that either an edge-triggered external or internal in-

terrupt condition has occurred. Figure 32 shows a block diagram of the Multi-Input Wake-Up module.

Note that the MIWU module is active while in Idle mode. Note, however, that because all device clocks are stopped in Idle

mode, the detection of a trigger condition on an input, and the resulting set of the pending flag, are not synchronous to the

system clock.

Table 17 lists the MIWU sources and interrupts used in the PC87591x.

Table 17. Input Assignments

Source

Destination

Name

MIWU Input

Interrupt Name

MIWU Output

PSCLK1

WUI10

PSWUINT

WKINTA

PSCLK2

WUI11

PSCLK3

WUI12

PSDAT1

WUI13

PSDAT2

WUI14

PSDAT3

WUI15

PSCLK4

WUI16

PSDAT4

WUI17

EWXINT20

WUI20

INT1

WKO20

EXWINT21

WUI21

INT31

WKO21

EXWINT22

WUI22

INT21

WKO22

EXWINT23

WUI23

INT6

WKO23

EXWINT24

WUI24

INT17

WKO24

SWIN

WUI25

INT14

WKO25

MSWC Wake-Up

WUI26

INT12

WKO26

T0OUT1

WUI27

T0OUTINT

WKO27

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