TMS370 datasheet(18/50 Pages) TI

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TMS370Cx1x

8-BIT MICROCONTROLLER

SPNS012F – MAY 1987 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

programmable timer 1

The programmable Timer 1 (T1) module of the TMS370Cx1x provides the designer with the enhanced timer

resources required to perform real-time system control. The T1 module contains the general-purpose timer and

the watchdog (WD) timer. The two independent 16-bit timers, T1 and WD, allow program selection of input clock

sources (real-time, external event, or pulse accumulate) with multiple 16-bit registers (input capture and

compare) for special timer function control. The Timer 1 module includes three external device pins that can

be used for multiple counter functions (operation-mode dependent), or used as general-purpose I/O pins. The

T1 module block diagram is shown in Figure 5.

T1IC/CR

Edge

Select

16-Bit

Counter

T1EVT

MUX

16-Bit

T1PWM

PWM

Toggle

16-Bit

WatchdogCounter

(Aux. Timer)

Interrupt

Logic

Capt/Comp

16-Bit

Compare

Interrupt

Logic

8-Bit

Prescaler

Figure 5. Timer 1 Block Diagram

D Three T1 I/O pins

–

T1IC/CR: T1 input capture / counter-reset input pin, or general-purpose bidirectional I/O pin

–

T1PWM: T1 pulse-width-modulation (PWM) output pin, or general-purpose bidirectional I/O pin

–

T1EVT: T1 event input pin, or general-purpose bidirectional I/O pin

D Two operational modes:

–

Dual-compare mode: Provides PWM signal

–

Capture/compare mode: Provides input capture pin

D One 16-bit general-purpose resettable counter

D One 16-bit compare register with associated compare logic

D One 16-bit capture/compare register, which, depending on the mode of operation, operates as either

capture or compare registers.

D One 16-bit WD counter can be used as an event counter, a pulse accumulator, or an interval timer if WD

feature is not needed.

D Prescaler/clock sources that determine one of eight clock sources for general-purpose timer

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