M16CSLASH1N datasheet(109/238 Pages) RENESAS

109 / 238 page

Rev.1.00

Oct 20, 2004

page 97 of 222

M16C/1N Group

12. Timers

REJ09B0007-0100Z

(n+1) X ((m+1)+(l+1))

Note 1: When the count is stopped, the Timer Z interrupt request bit becomes "1" and an interrupt may occur. Thus,

interrupts must be disabled before the count is stopped. Furthermore, set the Timer Z interrupt request bit to "0"

before starting counting again.

Note 2: When the counting stopped, the pin is the secondary period output level.

Note 3: Even when counting the secondary period, read out the Timer Z primary register.

Note 4: The set value of Timer Z secondary register and waveform extension control bits as well as Timer Z primary

the waveform output from the next primary period after writing to the Timer Z primary register.

Note 5: The output is switched in sync with Timer Z secondary underflow.

Note 6: When using the waveform extend function, the Prescaler Z register must be set to "0016".

When selecting Timer Y underflow and f1 for the count source, the waveform extend function cannot be used.

Item

Specification

Count source

f1, f8, Timer Y underflow, fC32

Count operation

• Down count

• When the timer underflows, it reloads the contents of primary reload register and sec-

ondary reload register alternately before continuing counting.

• When a counting stops, the timer reloads the content of the reload register before it

stops.

Divide ratio

n: Set value of Prescaler Z, m: Set value of Timer Z primary, l: Set value of Timer Z secondary

Count start condition

Count start flag is set (=1)

Count stop condition

Count start flag is reset (=0) (Note 1)

Interrupt request generation timing When Timer Z underflows during secondary period

TZOUT pin function

Pulse output (Note 2)

INT0 pin function

Programmable I/O port, or external interrupt input pin

Read from timer

Count value can be read out by reading Timer Z primary register.

Same applies to Prescaler Z register. (Note 3)

Write to timer

When a value is written to Timer Z primary register, it is written to only reload register.

Same applies to Timer Z secondary register and Prescaler Z register. (Note 4)

Select function

• Output level latch select function

The output level of an waveform being counted during primary and secondary periods

is selectable.

• Programmable waveform generation output switching function (Note 5)

Can select either programmable waveform or the value of port P31 register for output.

• Waveform extend function (Note 6)

The waveform output primary and secondary periods can each be extended 0.5 cycles

of the count source.

Frequency when waveform extended: 2xfi/((2x(m+1))+(2x(l+1))+TZPUM0+TZPUM1)

Duty: (2x(m+1)+TZPUM0)/((2x(m+1)+TZPUM0)+(2x(l+1)+TZPUM1))

m: set value of Timer Z primary, l: set value of Timer Z secondary

TZPUM0: Timer Z primary waveform extension control bit

TZPUM1: Timer Z secondary waveform extension control bit

12.4.2 Programmable Waveform Generation Mode

In this mode, the microcontroller, while counting the set values of Timer Z primary and Timer Z sec-

ondary alternately, outputs from the TZOUT pin a waveform whose polarity is inverted each time Timer

Z secondary underflows. (See Table 12.11) A counting starts by counting the value set in the Timer Z

primary. Figure 12.26 shows Timer Y, Z mode register and Timer Y, Z waveform output control regis-

ter in this mode. The Timer Z operates in the same way as the Timer Y in this mode. See Figure 12.19

shown the Timer Y operating example in programmable waveform generation mode.

Table 12.11 Specifications of programmable waveform generating mode

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