COP682C datasheet(15/30 Pages) NSC

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Functional Description (Continued)

TABLE IV

Config

Fun

Operation

Bit

Int SK

MICROWIRE Master

TRI-STATE Int SK

MICROWIRE Master

Ext SK

MICROWIRE Slave

TRI-STATE Ext SK

MICROWIRE Slave

TIMERCOUNTER

The device has a powerful 16-bit timer with an associated

16-bit register enabling them to perform extensive timer

functions The timer T1 and its register R1 are each orga-

nized as two 8-bit readwrite registers Control bits in the

under software control The timer-register pair can be oper-

ated in one of three possible modes Table V details various

timer operating modes and their requisite control settings

TLDD10802 – 9

FIGURE 7 MICROWIREPLUS Block Diagram

MODE 1 TIMER WITH AUTO-LOAD REGISTER

In this mode of operation the timer T1 counts down at the

instruction cycle rate Upon underflow the value in the regis-

ter R1 gets automatically reloaded into the timer which con-

tinues to count down The timer underflow can be pro-

grammed to interrupt the microcontroller A bit in the control

timer underflows This allow the generation of square-wave

outputs or pulse width modulated outputs under software

control (See

Figure 9 )

MODE 2 EXTERNAL COUNTER

In this mode the timer T1 becomes a 16-bit external event

counter The counter counts down upon an edge on the TIO

pin Control bits in the register CNTRL program the counter

to decrement either on a positive edge or on a negative

edge Upon underflow the contents of the register R1 are

automatically copied into the counter The underflow can

also be programmed to generate an interrupt (See

Figure 9 )

MODE 3 TIMER WITH CAPTURE REGISTER

Timer T1 can be used to precisely measure external fre-

quencies or events in this mode of operation The timer T1

counts down at the instruction cycle rate Upon the occur-

rence of a specified edge on the TIO pin the contents of the

timer T1 are copied into the register R1 Bits in the control

as a positive edge or as a negative edge In this mode the

user can elect to be interrupted on the specified trigger

edge (See

Figure 10 )

TLDD10802 – 10

FIGURE 8 MICROWIREPLUS Application

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