M32CSLASH86 datasheet(178/505 Pages) RENESAS

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Page 155

15. Timer (Timer A)

)

(

Table 15.5 Event Counter Mode Specifications (When Processing Two-phase Pulse Signal on

Timer A2, A3 and A4)

Item

Specification

Count Source

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

Counting Operation

• Two-phase pulse signal determines whether the timer increments or decrements a

counter value

• When the timer counter overflows or underflows, content of the reload register is

reloaded into the count register and counting resumes. With the free-running count

function, the timer counter continues running without reloading.

Divide Ratio

•

1/ (FFFF16 - n + 1) for counter increment

•

1/ (n + 1) for counter decrement

n : setting value of the TAi register 000016 to FFFF16

Counter Start Condition

The TAiS bit in the TABSR register is set to "1" (starts counting)

Counter Stop Condition

The TAiS bit is set to "0" (stops counting)

Interrupt Request Generation Timing The timer counter overflows or underflows

TAiIN Pin Function

Two-phase pulse signal is applied

TAiOUT Pin Function

Two-phase pulse signal is applied

Read from Timer

The TAi register indicates the counter value

Write to Timer

• When the timer counter stops, the value written to the TAi register is also written to

both reload register and counter

• While counting, the value written to the TAi register is written to the reload register

(It is transferred to the counter at the next reload timing)

Selectable Function(1)

• Normal processing operation (the timer A2 and timer A3)

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

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

counter on the falling edge.

TAjOUT

Increment

Decrement

TAjIN

Increment Increment

Decrement Decrement

TAkOUT

TAkIN

Increment on all edges

Decrement on all edges

NOTES:

1. Only timer A3 operation can be selected. The timer A2 is for the normal processing operation. The timer A4 is

for the multiply-by-4 operation.

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

While an "H" signal is applied to the TAkOUT pin (k = 3 or 4) on the rising edge of the

TAkIN pin, the timer increments a counter value on the rising and falling edges of the

TAkOUT and TAkIN pins.

While an "H" signal is applied to the TAkOUT pin on the falling edge of the TAkIN pin, the

timer decrements a counter value on the rising and falling edges of the TAkOUT and

TAkIN pins.

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