Справочник Пользователя для IBM PD78082

CHAPTER 6 8-BIT TIMER/EVENT COUNTERS 5 AND 6

6.4.3 Square-wave output

This makes the value set in advance in the 8-bit conveyor register 50, 60 (CR50, CR60) to be the interval. It operates

as a square wave output at the desired frequency.

The TO5/P100/TI5 or TO6/P101/TI6 pin output status is reversed at intervals of the count value preset to CR50

or CR60 by setting bit 1 (TMC51) and bit 0 (TOE5) of 8-bit timer output control register 5 (TMC5), or bit 1 (TMC61)

and bit 0 (TOE6) of 8-bit timer mode control register 6 (TMC6) to 1.

This enables a square wave of any selected frequency to be output.

Figure 6-12. 8-Bit Timer Mode Control Register Settings for Square-Wave Output Operation

Caution

When TI5/P100/TO5 or TI6/P101/TO6 pin is used as the timer output, set 0 to port mode register

(PM100 or PM101) and output latch (P100 or P101).

Remark

n = 5, 6

TCEn

TMCn6

0/1

LVSn LVRn TMCn1 TOEn

TMCn

0/1

TOn output enable

Inversion of output on match of TMn and CRn0

Specifies timer output F/F1 initial value

Clear and start mode on match of TMn and CRn0

TMn operation enable