CS5535 datasheet(153/555 Pages) NSC

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4.16 MULTI-FUNCTION GENERAL PURPOSE TIMER

The Multi-Function General Purpose Timer module con-

tains

eight

multi-function

general

purpose

timers

(MFGPTs). Six of the eight MFGPTs are in the Working

power domain running off a 32 kHz clock or a 14.318 MHz

clock, while the other two are in the Standby power domain

running off a 32 kHz clock.

The Working power domain contains the following blocks:

• Six MFGPTs each split into three blocks, one containing

I/O registers, one containing the clock switch, and one

containing the timer logic.

• 15-bit prescaler to divide down the 14.318 MHz clock

and generate 15 carry-out signals.

• 15-bit prescaler to divide down the 32 kHz clock and

generate 15 carry-out signals.

• Logic to implement Local Bus Interface, Control Logic,

MSR Registers, and NMI, IRQ, and Reset Output

Events.

• Two blocks containing I/O registers to write into the two

MFGPTs in the Standby power domain.

The Standby power domain contains the following blocks:

• Two MFGPTs.

• 15-bit prescaler to divide down the 32 kHz clock and

generate 15 carry-out signals.

• Interface for signals going between Standby and

Working power domains.

Figure 4-50 shows the top level block diagram of the Multi-

Function General Purpose Timer module.

Features

Each MFGPT operates independently and can have the

following features:

• 32 kHz or 14.318 MHz clock selectable by software

(MFGPT0 to MFGPT5 only; MFGPT6 and MFGPT7 use

32 kHz clock).

• Programmable input clock prescaler divisor to divide

input clock by 2i, where i = 0 to 15.

• Watchdog timer (trigger GPIO output, interrupt, or

reset).

• Pulse Width Modulation (PWM).

• Pulse Density Modulation (PDM).

• Blink (low frequency pulse for LED).

• General Purpose Timer.

• Generate GPIO outputs.

• Provide outputs for generating reset (limited to MFGPT0

to MFGPT5), IRQs, NMI, and ASMI (indirectly through

PIC).

Figure 4-50. MFGPT System Top Level Block

Diagram

Working Domain

Control and MSR Registers

MFGPT0

MFGPT6

Power Domain Crossing I/F

Standby Domain

14.318 MHz

32 kHz

Prescaler

32kHz

Prescaler

I/O Reg

Clock

Switch

Timer

MFGPT1

I/O Reg

Clock

Switch

Timer

MFGPT2

I/O Reg

Clock

Switch

Timer

MFGPT3

I/O Reg

Clock

Switch

Timer

MFGPT4

I/O Reg

Clock

Switch

Timer

MFGPT5

I/O Reg

Clock

Switch

Timer

I/O Reg I/F

MFGPT7

I/O Reg I/F

MFGPT6

Timer

MFGPT7

Timer

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