pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 130

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

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4.0 Embedded Controller Modules
4.7
The PC87591L-N05 includes two Multi-Function Timer (MFT) modules. The registers of each module are prefixed with Tn,
and the signals are suffixed with an n (where n is the module’s number, i.e., 1 or 2). Each MFT16 module consists of two
functional units designed to satisfy a wide range of application requirements. The units include:
Figure 43 shows the contents of an MFT16 and the top-level interaction. The rest of the section describes an MFT16 module.
4.7.1
• Clock Source Unit that contains a pre-scaler with one clock source selector for each counter.
• Main timer/counter and action unit that contains two counters, two reload registers for PWM, Input Capture or
• Mode selector/control unit that defines the function of the I/O pins and the interrupts.
• Two 16-bit programmable timers/counters
• Two 16-bit reload/capture registers. These registers are used either as reload registers or capture registers, depend-
• A 5-bit fully programmable clock pre-scaler
• Clock source selectors for each counter. These enable each counter to operate in:
• Two I/O pins (TAn and TBn), with programmable edge detection; these operate as:
• Two interrupts, one for each counter, that can be generated/ triggered by:
• Four pending bits, which can be polled by software, are associated with the two interrupts.
Counter modes.
ing on the mode of operation.
— Pulse accumulate mode
— External event mode
— Prescaled system clock mode
— Slow speed clock (LFCLK) input mode
— Capture inputs
— Capture and preset inputs
— External event (clock) inputs
— PWM outputs
— Timer underflow
— Timer reload
— Input capture
32.768 KHz)
External Event
(LFCLK
System
MULTI-FUNCTION 16-BIT TIMER (MFT16)
Clock
Clock
Slow
Features
Reload/Capture
Timer/Counter
Pre-Scaler
Source
Clock
and
Counter 1
Counter 2
Clock
Clock
Figure 43. MFT16 Functional Diagram
PWM/Capture/Counter Mode Select
Timer/Counter and Action
Reload/Capture A
Reload/Capture B
Timer/Counter 1
Timer/Counter 2
(Continued)
TnCNT1
TnCNT2
TnCRA
TnCRB
& Control
130
Interrupt B
Interrupt A
Revision 1.2
TAn
TBn