R8CSLASH15 datasheet(124/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

13. Timers

Rev.2.10

Jan 19, 2006

Page 112 of 253

REJ09B0164-0210

NOTES:

1. Set the TZS bit in the TZMR register to “1” (count starts).

2. Set the TZS bit to “1” (count starts), the INT0EN bit in the INTEN register to “1” (enables INT0 input),

and the INOSTG bit in the PUM register to “1” (enabling INT0 one-shot trigger). A trigger which is

input during the count cannot be acknowledged, however the INT0 interrupt request is generated.

3. The setting values are reflected beginning with the following one-shot pulse after writing to the

TZPR register.

Table 13.10

Specification of Programmable Wait One-Shot Generation Mode Specifications

Item

Specification

Count Source

f1, f2, f8, Timer X underflow

Count Operation

• Decrement the setting value in Timer Z primary

• When a count of TZPR register underflows, the timer reloads the

contents of the TZSC register before the count continues.

• When a count of the TZSC register underflows, the timer reloads the

contents of the TZPR register before the count completes and the TZOS

bit is set to “0”.

• When a count stops, the timer reloads the contents of the reload register

before it stops.

Wait Time

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

fi: Count source frequency

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

One-Shot Pulse Output Time (n+1)(p+1)/fi

fi: Count source frequency

n: setting value in PREZ register, p: setting value in TZSC register

Count Start Condition

• Set the TZOS bit in the TZOC register to “1” (one-shot starts)(1)

• Input active trigger to the INT0 pin(2)

Count Stop Condition

• When reloading completes after Timer Z underflows during secondary

period

• When the TZS bit in the TZMR register is set to “0” (count stops)

• When the TZOS bit in the TZOC register is set to “0” (one-shot stops)

Interrupt Request

Generation Timing

In half cycles of the count source after Timer Z underflows during

secondary period (complete at the same time as waveform output from the

TZOUT pin) [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

• When the INOSTG bit in the PUM register is set to “0” (INT0 one-shot

trigger disabled), programmable I/O port or INT0 interrupt input

• When the INOSTG bit in the PUM register is set to “1” (INT0 one-shot

trigger enabled), external trigger (INT0 interrupt input)

Read from Timer

The count value can be read out by reading the TZPR and PREZ

registers.

Write to Timer

The value written to the TZPR register, PREZ and TZSC register is written

to reload register only(3).

Select Function

• Output level latch select function

The output level for the one-shot pulse waveform is selected by the

TZOPL bit.

•INT0 pin one-shot trigger control function and polarity select function

Trigger input from the INT0 pin can be set to active or inactive by the

INOSTG bit. Also, an active trigger's polarity can be selected by the

INOSEG bit.

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