R8CSLASH13 datasheet(104/224 Pages) RENESAS

104 / 224 page

Rev.1.20

Jan 27, 2006

page 93 of 205

REJ09B0111-0120

R8C/13 Group

12.3.2 Programmable Waveform Generation Mode

In this mode, an signal output from the TZOUT pin is inverted each time the counter underflows, while

the values in the TZPR register and TZSC register are counted alternately (see “Table 12.10 Program-

mable Waveform Generation Mode Specifications”). A counting starts by counting the value set in the

TZPR register. Figure 12.23 shows TYZMR and PUM registers in this mode. The Timer Z operates in

the same way as the Timer Y in this mode. See Figure 12.17 (Timer Y operation ex

ample in programmable waveform generation mode ).

Item

Specification

Count source

f1, f2, f8, Timer Y underflow

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.

Output waveform width

Primary period

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

and period

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

Period

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

fi : Count source frequency

n: Set value in PREZ register, m: Set value in TZPR register, p: Set value in TZSC register

Count start condition

Write “1” (count start) to the TZS bit in the TYZMR register

Count stop condition

Write “0” (count stop) to the TZS bit in the TYZMR 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

Use timer mode when using this pin as a programmable I/O port.

_____

INT0 pin functions

_______

Programmable I/O port, or INT0 interrupt input

Read from timer

Count value can be read out by reading TZPR register.

Same applies to PREZ register(2).

Write to timer

Value written to TZPR register is written to reload register only.

Same applies to TZSC register and PREZ register(3).

Select function

• Output level latch select function

The output level during primary and secondary periods is selected by the TZOPL bit.

• Programmable waveform generation output switching function

The output from TZOUT is inverted synchronously when Timer Z underflows by setting

the TZOCNT bit in the TYZOC register to “0”. A value in the P3_1 bit is output from the

TZOUT by setting to “1”(3).

NOTES:

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

2. The set value in the TZPR register and TZSC register are enabled by writing a value to the TZPR register. The set

values are reflected to the waveform output beginning with the next primary period after writing to the Timer Z primary

3. The TZOCNTbit is enabled in the following timings

• When count starts

• When Timer Z interrupt request is generated

Therefore, pulse is output from the next primary period depending on the setting value of the TZOCNT bit.

Table 12.10 Programmable Waveform Generation Mode Specifications

12.3 Timer (Timer Z)

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