CR16MCS5VJI8 Datasheet

IC型号：
CR16MCS5VJI8
PDF描述：
Family of 16-bit CAN-enabled CompactRISC Microcontrollers
文件大小：
713.21KB
PDF页数：
156页
芯片厂家：
NSC

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16.0 Versatile-Timer-Unit (VTU)

The Versatile Timer Unit (VTU) contains four fully indepen-

dent 16-bit timer subsystems. Each timer subsystem can op-

erate either as dual 8-bit PWM timers, as a single 16-bit

PWM timer, or as a 16-bit counter with 2 input capture chan-

nels. These timer subsystems offers an 8-bit clock prescaler

to accommodate a wide range of system frequencies.

The Versatile Timer Unit offers the following features:

鈥?/div>

The Versatile Timer Unit (VTU) can be configured to pro-

vide:

鈥?Eight fully independent 8-bit PWM channels

鈥?Four fully independent 16-bit PWM channels

鈥?Eight 16-bit input capture channels

鈥?/div>

The VTU consists of four timer subsystems, each of which

contains:

鈥?a 16-bit counter

鈥?two 16-bit capture / compare registers

鈥?an 8-bit fully programmable clock prescaler

鈥?/div>

Each of the four timer subsystems can operate in the fol-

lowing modes:

鈥?low power mode, i.e. all clocks are stopped

鈥?dual 8-bit PWM mode

鈥?16-bit PWM mode

鈥?dual 16-bit input capture mode

鈥?/div>

The Versatile-Timer-Unit controls a total of eight I/O pins,

each of which can function as either:

鈥?PWM output with programmable output polarity

鈥?Capture input with programmable event detection and

timer reset

鈥?/div>

A flexible interrupt scheme with

鈥?four separate system level interrupt requests

鈥?a total of 16 interrupt sources each with a separate in-

terrupt pending flag and interrupt enable bit

16.1

VTU FUNCTIONAL DESCRIPTION

The Versatile-Timer-Unit (VTU) is comprised of four timer

subsystems. Each timer subsystem contains an 8-bit clock

prescaler, a 16-bit up-counter and two 16-bit registers. Each

timer subsystem controls two I/O pins which either function

as PWM outputs or capture inputs depending on the mode of

operation. There are four system level interrupt requests,

one for each timer subsystem. Each system level interrupt re-

quest is controlled by four interrupt pending flags with asso-

ciated enable/disable bits. All four timer subsystems are fully

independent and each may operate as a dual 8-bit PWM tim-

er, a 16-bit PWM timer or as a dual 16-bit capture timer. Fig-

ure 18 illustrates the main elements of the Versatile-Timer-

Unit (VTU).

MODE

IO1CTL

INTCTL

IO2CTL

INTPND

Timer Subsystem 1

Timer Subsystem 2

Timer Subsystem 3

Timer Subsystem 4

C1PRSC

Prescaler

Counter

C2PRSC

Prescaler

Counter

C3PRSC

Prescaler

Counter

C4PRSC

Prescaler

Counter

COUNT1

compare - capture

COUNT2

compare - capture

COUNT3

compare - capture

COUNT4

compare - capture

PERCAP1

compare - capture

PERCAP2

compare - capture

PERCAP3

compare - capture

PERCAP4

compare - capture

DTYCAP1

DTYCAP2

DTYCAP3

DTYCAP4

I/O control

TIO1

TIO2

TIO3

TIO4

TIO5

TIO6

TIO7

TIO8

Figure 18. VTU Block Diagram

www.national.com

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