CP3SP33SMSSLASHNOPB datasheet(11/407 Pages) TI1

11 / 407 page

CP3SP33

www.ti.com

SNOSCW5 – MAY 2013

3.18 Versatile Timer Units

The two Versatile Timer Unit (VTU) modules each contain four independent timer subsystems, which

operate as a dual 8-bit PWM configuration, a single 16-bit PWM timer, or a 16-bit counter with two input

capture channels. Each of the timer subsystems offer an 8-bit clock prescaler to accommodate a wide

range of frequencies.

3.19 Timing and Watchdog Module

The Timing and Watchdog Module (TWM) contains a Real-Time timer and a Watchdog unit. The Real-

Time Clock Timing function can be used to generate periodic real-time based system interrupts. The timer

output is one of 16 inputs to the Multi-Input Wake-Up module which can be used to exit from a low-power

mode. The Watchdog unit is designed to detect the application program getting stuck in an infinite loop

resulting in loss of program control or “runaway” programs. When the watchdog triggers, it resets the

device. The TWM is clocked by the low-speed Slow Clock.

3.20 Power Management

The Power Management Module (PMM) improves the efficiency of the device by changing the operating

mode and power consumption to match the required level of activity.

The device can operate in any of four power modes:

•

Active: The device operates at full speed using the high-frequency clock. All device functions are fully

operational.

•

Power Save: The device operates at reduced speed using the Slow Clock. The CPU and some

modules can continue to operate at this low speed.

•

Idle: The device is inactive except for the Power Management Module and Timing and Watchdog

Module, which continue to operate using the Slow Clock.

•

Halt: The device is inactive but still retains its internal state (RAM and register contents).

The PMM provides a mechanism to handle Bluetooth-specific power management modes, for optimizing

power consumption during special Bluetooth states, like Park, Page Scan, Inquiry Scan, etc.

3.21 Multi-Input Wake-up

The Multi-Input Wake-Up (MIWU) feature is used to return (wake-up) the device from low-power modes to

the active mode. The 64-channel MIWU unit receives wake-up signals from various internal and external

sources. In addition to the wake-up function, the MIWU unit can generate up to eight interrupt requests.

Each MIWU channel can be individually programmed to activate one of the interrupt requests.

3.22 Input/Output Ports

The device has 64 software-configurable I/O pins (36 in the FBGA-144 package), organized into four ports

called Port E, Port F, Port G, and Port H. Each pin can be configured to operate as a general-purpose

input or general-purpose output. In addition, many I/O pins can be configured to operate as inputs or

outputs for on-chip peripheral modules such as the UARTs or timers.

The I/O pin characteristics are fully programmable. Each pin can be configured to operate as a TRI-

STATE output, push-pull output, weak pullup/pulldown input, high-speed drive, or high-impedance input.

3.23 Clock and Reset Module

The Clock and Reset module generates a 12-MHz Main Clock from an external crystal network or external

clock in-put. Main Clock may be used as a reference clock for two PLL-based clock multipliers available

for generating higher-speed clocks.

Device Overview

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