R8CSLASH15 datasheet(117/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

13. Timers

Rev.2.10

Jan 19, 2006

Page 105 of 253

REJ09B0164-0210

13.2.2

Programmable Waveform Generation Mode

Programmable waveform generation mode is mode to invert the signal output from the TZOUT pin

each time the counter underflows, while the values in the TZPR and TZSC registers are counted

alternately (See Table 13.8 Specification of Programmable Waveform Generation Mode). A

counting starts by counting the value set in the TZPR register. Figure 13.17 shows TZMR and PUM

Registers in Programmable Waveform Generation Mode. Figure 13.18 shows Operating Example of

Timer Z in Programmable Waveform Generation Mode.

NOTES:

1. Even when counting the secondary period, read out the TZPR register.

2. The setting value in the TZPR register and TZSC register are made effective by writing a value to

the TZPR register. The set values are reflected to the waveform output beginning with the following

primary period after writing to the TZPR register.

3. The TZOCNT bit is enabled by the followings.

• When count starts.

• When the timer Z interrupt request is generated. The contents after the TZOCNT bit is changed

are reflected from the output of the following primary period.

Table 13.8

Specification of Programmable Waveform Generation Mode

Item

Specification

Count Source

f1, f2, f8, Timer X underflow

Count Operation

• Decrement

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

secondary reload registers alternately before the count continues.

Width and Period of

Output Waveform

Primary period: (n+1)(m+1)/fi

Secondary period: (n+1)(p+1)/fi

Period: (n+1){(m+1)+(p+1)}/fi

fi: Count source frequency

n: Setting value in PREZ register, m: setting value in TZPR register, p: setting

value in TZSC register

Count Start Condition Write “1” (count start) to the TZS bit in the TZMR register

Count Stop Condition Write “0” (count stop) to the TZS bit in the TZMR register

Interrupt Request

Generation Timing

In half of count source, after Timer Z underflows during secondary period (at the

same time as the TZout output change) [Timer Z interrupt]

TZOUT Pin Function

Pulse output

(When using this function as a programmable I/O port, set to timer mode.)

INT0 Pin Function

Programmable I/O port, or INT0 interrupt input

Read from timer

The count value can be read out by reading the TZPR and PREZ registers(1).

Write to timer

The value written to the TZSC, PREZ and TZPR registers is written to the reload

Select function

• Output level latch select function

The TZOPL bit can select the output level during primary and secondary

periods.

• Programmable waveform generation output switch function

When the TZOCNT bit in the TZOC register is set to “0”, the output from the

TZOUT pin is inverted synchronously when Timer Z underflows. And when

setting to “1”, output the value in the P1_3 bit from the TZOUT pin(3)

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