pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 105

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

Revision 1.07
Embedded Controller Modules
4.4
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
4.4.2
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.
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
MULTI-INPUT WAKE-UP (MIWU)
Features
Operation
MSWC Wake-Up
EWXINT20
EXWINT21
EXWINT22
EXWINT23
EXWINT24
PSCLK1
PSCLK2
PSCLK3
PSCLK4
PSDAT1
PSDAT2
PSDAT3
PSDAT4
T0OUT
Name
SWIN
1
Source
(Continued)
Table 17. Input Assignments
MIWU Input
WUI10
WUI11
WUI12
WUI13
WUI14
WUI15
WUI16
WUI17
WUI20
WUI21
WUI22
WUI23
WUI24
WUI25
WUI26
WUI27
105
Interrupt Name
T0OUTINT
PSWUINT
INT31
INT21
INT17
INT14
INT12
INT1
INT6
Destination
MIWU Output
WKINTA
WKO20
WKO21
WKO22
WKO23
WKO24
WKO25
WKO26
WKO27
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