TMS370 datasheet(24/73 Pages) TI

24 / 73 page

TMS370Cx6x

8-BIT MICROCONTROLLER

SPNS033C – SEPTEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

timer 1 module

The programmable timer 1 (T1) module of the TMS370Cx6x 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 T1 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

is shown in Figure 5.

T1IC/CR

Edge

Select

16-Bit

Counter

T1EVT

MUX

16-Bit

T1PWM

PWM

Toggle

16-Bit

Watchdog Counter

(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: Timer 1 input capture/counter reset input pin, or general-purpose bidirectional I/O pin

–

T1PWM: Timer 1 pulse-width-modulation (PWM) output pin, or general-purpose bidirectional I/O pin

–

T1EVT: Timer 1 event input pin, or general-purpose bidirectional I/O pin

D Two operation 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 register

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

if watchdog feature is not needed.

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

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