M32CSLASH8A datasheet(175/372 Pages) RENESAS

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M32C/8A Group

15. Timers (Timer A)

Rev.1.00

Jul 15, 2007

Page 158 of 352

REJ09B0385-0100

Table 15.5

Specifications of Event Counter Mode When Handling Two-Phase Pulse Signals on

Timers A2, A3, and A4

NOTES:

1. Wait for one count source cycle or more to write after the count starts.

2. Any operation can be selected for timer A3. Timer A2 is used only for the normal processing operation. Timer

A4 is used only for the multiply-by-4 operation.

Item

Specification

Count source

Two-phase pulse signals applied to pins TAiIN and TAiOUT (i = 2 to 4)

Count operation

• Count direction (increment or decrement) is set by a two-phase pulse signal.

• Reload/Free-run type can be selected.

Reload function: The contents of the reload register are reloaded into the

counter and the count continues when the timer underflows or overflows.

Free-running function: The counter continues running without reloading when

the timer underflows or overflows.

Number of counting

(FFFFh - n + 1): when incrementing

n + 1: for decrementing

n: setting value of the TAi register, 0000h to FFFFh

Count start condition

The TAiS bit in the TABSR Register is set to 1 (count starts)

Count stop condition

The TAiS bit is set to 0 (count stops)

Interrupt request generation timing When the timer overflows or underflows

TAiIN pin function

Two-phase pulse input

TAiOUT pin function

Two-phase pulse input

Read from timer

A read from the TAi register returns a counter value

Write to timer

• A write to the TAi register while the count is stopped:

The value is written to both the reload register and the counter.

• A write to the TAi register while counting:

The value is written to the reload register (It is transferred to the counter at the

next reload timing).(1)

Selectable function(2)

• Normal processing operation (Timers A2 and A3)

While a high-level (“H”) signal is applied to the TAjOUT pin (j = 2, 3), the timer

increments a counter value at the rising edge of the TAjIN pin or decrements a

counter value at the falling edge.

• Multiply-by-4 processing operation (Timers A3 and A4)

The timer increments the counter value in the following timings:

-at the rising edge of TAkIN while TAkOUT is “H” (k = 3, 4)

-at the falling edge of TAkIN while TAkOUT is “L”

-at the rising edge of TAkOUT while TAkIN is “L”

-at the falling edge of TAkOUT while TAkIN is “H”

The timer decrements the counter in the following timings:

-at the rising edge of TAkIN while TAkOUT is “L”

-at the falling edge of TAkIN while TAkOUT is “H”

-at the rising edge of TAkOUT while TAkIN is “H”

-at the falling edge of TAkOUT while TAkIN is “L”

• Counter reset by a Z-phase pulse signal input (Timer A3)

The counter value is cleared to 0 by a Z-phase pulse signal input

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