CP3BT10 Datasheet, PDF(61/210 Page) National Semiconductor (TI) – Reprogrammable Connectivity Processor with Bluetooth and USB Interfaces

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CP3BT10 Datasheet, PDF (61/210 Pages) National Semiconductor (TI) – Reprogrammable Connectivity Processor with Bluetooth and USB Interfaces

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13.0 Multi-Input Wake-Up

The Multi-Input Wake-Up Unit (MIWU) monitors its 16 input

channels for a software-selectable trigger condition. On de-

tection of a trigger condition, the module generates an inter-

rupt request and if enabled, a wake-up request. A wake-up

request can be used by the power management unit to exit

the Halt, Idle, or Power Save mode and return to the active

mode. An interrupt request generates an interrupt to the

CPU (interrupt IRQ2âIRQ5), which allows an interrupt han-

dler to respond to MIWU events.

The MIWU is active at all times, including the Halt mode. All

device clocks are stopped in this mode. Therefore, detecting

an external trigger condition and the subsequent setting of

the pending bit are not synchronous to the System Clock.

13.1 MULTI-INPUT WAKE-UP REGISTERS

Table 29 lists the MIWU unit registers.

Table 29 Multi-Input Wake-Up Registers

The wake-up event only activates the clocks and CPU, but

does not by itself initiate execution of any code. It is the in-

terrupt request associated with the MIWU that gets the CPU

to start executing code, by jumping to the corresponding in-

terrupt handler. Therefore, setting up the MIWU interrupt

handler is essential for any wake-up operation.

There are four interrupt requests that can be routed to the

ICU as shown in Figure 10. Each of the 16 MIWU channels

can be programmed to activate one of these four interrupt

requests.

The MIWU channels are named WUI0 through WUI15, as

shown in Table 28.

Table 28 MIWU Sources

Name

WKEDG

WKENA

WKIENA

WKICTL1

WKICTL2

Address

FF FC80h

FF FC82h

FF FC8Ch

FF FC84h

FF FC86h

Description

Wake-Up Edge

Detection Register

Wake-Up Enable

Wake-Up Interrupt

Enable Register

Wake-Up Interrupt

Control Register 1

Wake-Up Interrupt

Control Register 2

MIWU Channel

WUI0

WUI1

Source

TWM-T0OUT

ACCESS.bus

WKPND

WKPCL

FF FC88h

FF FC8Ah

Wake-Up Pending

Clear Register

WUI2

WUI3

WUI4

WUI5

WUI6

Reserved

MWCS

CTS

RXD

Bluetooth LLC

13.1.1 Wake-Up Edge Detection Register (WKEDG)

The WKEDG register is a word-wide read/write register that

controls the edge sensitivity of the MIWU channels. The

WKEDG register is cleared upon reset, which configures all

channels to be triggered on rising edges. The register for-

mat is shown below.

WUI7

AAI SFS

WUI8

USB Wake-Up

WKED

WUI9

PI6

WUI10

WUI11

WUI12

WUI13

WUI14

WUI15

PG0

PG1

PG2

PG3

PG6

PG7

WKED

The Wake-Up Edge Detection bits control the

edge sensitivity for MIWU channels. The

WKED15:0 bits correspond to the WUI[15:0]

channels, respectively.

0 â Triggered on rising edge (low-to-high

transition).

1 â Triggered on falling edge (high-to-low

transition).

Each channel can be configured to trigger on rising or falling

edges, as determined by the setting in the WKEDG register.

Each trigger event is latched into the WKPND register. If a

trigger event is enabled by its respective bit in the WKENA

Software can determine which channel has generated the

active signal by reading the WKPND register.

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